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Assam Agricultural University, Jorhat

Assam Agricultural University is the first institution of its kind in the whole of North-Eastern Region of India. The main goal of this institution is to produce globally competitive human resources in farm sectorand to carry out research in both conventional and frontier areas for production optimization as well as to disseminate the generated technologies as public good for benefitting the food growers/produces and traders involved in the sector while emphasizing on sustainability, equity and overall food security at household level. Genesis of AAU - The embryo of the agricultural research in the state of Assam was formed as early as 1897 with the establishment of the Upper Shillong Experimental Farm (now in Meghalaya) just after about a decade of creation of the agricultural department in 1882. However, the seeds of agricultural research in today’s Assam were sown in the dawn of the twentieth century with the establishment of two Rice Experimental Stations, one at Karimganj in Barak valley in 1913 and the other at Titabor in Brahmaputra valley in 1923. Subsequent to these research stations, a number of research stations were established to conduct research on important crops, more specifically, jute, pulses, oilseeds etc. The Assam Agricultural University was established on April 1, 1969 under The Assam Agricultural University Act, 1968’ with the mandate of imparting farm education, conduct research in agriculture and allied sciences and to effectively disseminate technologies so generated. Before establishment of the University, there were altogether 17 research schemes/projects in the state under the Department of Agriculture. By July 1973, all the research projects and 10 experimental farms were transferred by the Government of Assam to the AAU which already inherited the College of Agriculture and its farm at Barbheta, Jorhat and College of Veterinary Sciences at Khanapara, Guwahati. Subsequently, College of Community Science at Jorhat (1969), College of Fisheries at Raha (1988), Biswanath College of Agriculture at Biswanath Chariali (1988) and Lakhimpur College of Veterinary Science at Joyhing, North Lakhimpur (1988) were established. Presently, the University has three more colleges under its jurisdiction, viz., Sarat Chandra Singha College of Agriculture, Chapar, College of Horticulture, Nalbari & College of Sericulture, Titabar. Similarly, few more regional research stations at Shillongani, Diphu, Gossaigaon, Lakhimpur; and commodity research stations at Kahikuchi, Buralikson, Tinsukia, Kharua, Burnihat and Mandira were added to generate location and crop specific agricultural production packages.

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  • ThesisItemOpen Access
    MORPHO-BIOCHEMICAL CHARACTERIZATION OF ROUGH LEMON (Citrus jambhiri Lush.) OF ASSAM
    (2019-07) Pathak, Purnima; Khangia, B.
    Rough lemon (Citrus jambhiri Lush.), commonly known as ‘Gol Nemu’ is an underutilized citrus fruit of Assam. It is mostly grown as backyard crop in homestead garden. The fruit is a rich source of vitamins, minerals, flavonoids, limonoids etc. It is polyembryonic in nature and highly cross pollinated. Most rough lemon plants are of seedling origin in the region and thus tend to exhibit a wide range of variability in terms of morphological and biochemical parameters. Therefore, an investigation was undertaken during 2016-2017 on ‘Morpho-biochemical characterization of rough lemon (Citrus jambhiri Lush.) of Assam to study the existing variability. One district in each of the six agro climatic zones was chosen and five plants were selected in each district, comprising of thirty plants. Wide variability was observed among the selected rough lemon accessions for qualitative characters of tree, leaf, flower, fruit and seed. Four different fruit shapes were recorded viz. spheroid, obloid, obovoid and ellipsoid. Wide variations in pulp colour i.e. ivory white, orange, orange-red, yellow were recorded in the selected rough lemon. Cluster analysis of 45 qualitative and 25 quantitative characters using SPSS resulted in grouping of the rough lemon accessions into three broad groups. Group I consisted of 17 accessions (AR01T1, AR01T2, AR01T3, AR02T1, AR02T2, AR02T3, AR02T4, AR03T2, AR03T3, AR04T4, AR05T1, AR05T2, AR05T3, AR05T4, AR06T2, AR06T3, AR06T5) of all locations. Group II consisted of six accessions (AR01T5, AR03T1, AR03T4, AR03T5, AR04T1, AR06T1). Group III consisted of seven accessions (AR01T4, AR02T5, AR04T2, AR04T3, AR04T5, AR05T5, AR06T4). No groups were formed based on geographical location indicating that qualitative and quantitative traits were largely influenced by genetic factor. The quantitative characters of flower, leaf and fruit showed significant variation among the rough lemon accessions. The maximum fruit weight was recorded in accession number AR02T5 (144.34 g) and the minimum was recorded in AR03T1 (17.36 g). In terms of biochemical constituents, the highest TSS was recorded in accession number AR06T4 (8.87 °B) and the lowest was recorded in AR02T1 (6.13 °B). The highest TSS-acid ratio was recorded in accession number AP06T4 (2.12) and the lowest was recorded in AR02T1 (1.00). HPLC quantification of limonin showed significant variations among the rough lemon accessions which ranged from 10.42 to 24.07 mg/100ml. Among the 30 rough lemon accessions, two main groups were recognized based on 12 biochemical constituents with strong genetic similarity within a location. All the morphological quantitative traits i.e. fruit length, fruit diameter, rind thickness, seeds per fruit, seed weight, juice content, juice per cent showed significant variation among different locations. Significant differences among the locations were observed with respect to biochemical constituents except essential oil content. The highest TSS, total sugar, TSS-acid ratio were recorded in location L6 (Cachar) and the lowest value was recorded in location L4 (Biswanath). Present study on propagation of rough lemon through seed showed an average germination percentage of 87.67 % and air layering recorded a success percentage of 92.11%. However, propagation through stem cutting was found to be comparatively difficult with moderate success percentage (79.11%). Three elite types i.e. AR03T1, AR06T1 and AP06T4 were identified in terms of high overall acceptability (>8), TSS-acid ratio (>2.00), less seed content (≤10 per fruit), low limonin content, high essential oil (>4%), high ascorbic acid and antioxidant activity (>80mg/100ml juice) and thin to medium rind thickness.
  • ThesisItemOpen Access
    HEAT UNIT INDEXING OF GARDEN PEA IN RELATION TO CLIMATE SHIFT AND NUTRIENT MANAGEMENT
    (2019-07) Sangma, Trudy Tengse A.; Saikia, Luchon
    An experiment was conducted consecutively during 2016-17 and 2017-18 in the Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat to study the “Heat unit indexing of garden pea in relation to climate shift and nutrient management”. The experiment consist three treatments viz., variety (main), fertility management level (sub) and sowing date (sub-sub) laid out in split plot design with random allocation and replicated thrice. The main treatment consisted Arkel(V1), A1(V2), DS-10(V3) and GS-10(V4); sub treatment was comprised of 5t FYM, 10-46-0 kgha-1 (F1), 10t FYM, 10-46-10 kgha-1 (F2), 10t FYM, 20-46-20 kgha-1 (F3) and 10t FYM, 30-46-30 kgha-1 (F4) and sub-sub treatment was dates of sowing: 10th October (S1), 24th October (S2), 7th November (S3), 21st November (S4), 5th December (S5) and 20th December (S6). Growth, yield attributes, soil related and quality characters viz., plant height(cm), days to 50% flowering, pod plant-1, pod length (cm), pod diameter (cm), seed pod-1, shelling (%), pod yield (tha-1), duration (days), growing degree days, root nodules plant-1, total plant nitrogen (%), total plant phosphorus(%), total potash (%), TSS (0 Brix), crude protein (%), soil organic carbon (%), soil available nitrogen (kgha-1), soil available phosphorus (kgha-1), soil available potash (kgha-1) and soil pH have responded significantly due to treatments as well as their interactions, except pH. Variety evidently produced significant effect on growing degree days (GDD) and results showed V4>V3>V2>V1 with requirement of 955, 948, 933 and 833 GDD for 2016-17 and similarly 958, 949, 942 and 825 GDD. The maximum duration was reported as 76.00days in V4F with (1,2,3,4) and S( with 3,4,5). Duration was closely associated with degree days by sowing date had indicated significant duration among varieties, least with V1(58.73days), to maximum in V4(72.30days). Fertility level had a range of maturity at 68.08 to 68.29days. Sowing dates showed significance as 911(S1), 915(S2), 915(S3), 915(S4), 916(S5) and 918(S6) during 2016-17 and the GDD was found significant as S1
  • ThesisItemOpen Access
    MORPHO-BIOCHEMICAL CHARACTERIZATION OF ROUGH LEMON (Citrus jambhiri Lush.) OF ASSAM
    (2019-07) Pathak, Purnima; Khangia, B.
    Rough lemon (Citrus jambhiri Lush.), commonly known as ‘Gol Nemu’ is an underutilized citrus fruit of Assam. It is mostly grown as backyard crop in homestead garden. The fruit is a rich source of vitamins, minerals, flavonoids, limonoids etc. It is polyembryonic in nature and highly cross pollinated. Most rough lemon plants are of seedling origin in the region and thus tend to exhibit a wide range of variability in terms of morphological and biochemical parameters. Therefore, an investigation was undertaken during 2016-2017 on ‘Morpho-biochemical characterization of rough lemon (Citrus jambhiri Lush.) of Assam to study the existing variability. One district in each of the six agro climatic zones was chosen and five plants were selected in each district, comprising of thirty plants. Wide variability was observed among the selected rough lemon accessions for qualitative characters of tree, leaf, flower, fruit and seed. Four different fruit shapes were recorded viz. spheroid, obloid, obovoid and ellipsoid. Wide variations in pulp colour i.e. ivory white, orange, orange-red, yellow were recorded in the selected rough lemon. Cluster analysis of 45 qualitative and 25 quantitative characters using SPSS resulted in grouping of the rough lemon accessions into three broad groups. Group I consisted of 17 accessions (AR01T1, AR01T2, AR01T3, AR02T1, AR02T2, AR02T3, AR02T4, AR03T2, AR03T3, AR04T4, AR05T1, AR05T2, AR05T3, AR05T4, AR06T2, AR06T3, AR06T5) of all locations. Group II consisted of six accessions (AR01T5, AR03T1, AR03T4, AR03T5, AR04T1, AR06T1). Group III consisted of seven accessions (AR01T4, AR02T5, AR04T2, AR04T3, AR04T5, AR05T5, AR06T4). No groups were formed based on geographical location indicating that qualitative and quantitative traits were largely influenced by genetic factor. The quantitative characters of flower, leaf and fruit showed significant variation among the rough lemon accessions. The maximum fruit weight was recorded in accession number AR02T5 (144.34 g) and the minimum was recorded in AR03T1 (17.36 g). In terms of biochemical constituents, the highest TSS was recorded in accession number AR06T4 (8.87 °B) and the lowest was recorded in AR02T1 (6.13 °B). The highest TSS-acid ratio was recorded in accession number AP06T4 (2.12) and the lowest was recorded in AR02T1 (1.00). HPLC quantification of limonin showed significant variations among the rough lemon accessions which ranged from 10.42 to 24.07 mg/100ml. Among the 30 rough lemon accessions, two main groups were recognized based on 12 biochemical constituents with strong genetic similarity within a location. All the morphological quantitative traits i.e. fruit length, fruit diameter, rind thickness, seeds per fruit, seed weight, juice content, juice per cent showed significant variation among different locations. Significant differences among the locations were observed with respect to biochemical constituents except essential oil content. The highest TSS, total sugar, TSS-acid ratio were recorded in location L6 (Cachar) and the lowest value was recorded in location L4 (Biswanath). Present study on propagation of rough lemon through seed showed an average germination percentage of 87.67 % and air layering recorded a success percentage of 92.11%. However, propagation through stem cutting was found to be comparatively difficult with moderate success percentage (79.11%). Three elite types i.e. AR03T1, AR06T1 and AP06T4 were identified in terms of high overall acceptability (>8), TSS-acid ratio (>2.00), less seed content (≤10 per fruit), low limonin content, high essential oil (>4%), high ascorbic acid and antioxidant activity (>80mg/100ml juice) and thin to medium rind thickness.
  • ThesisItemOpen Access
    HEAT UNIT INDEXING OF GARDEN PEA IN RELATION TO CLIMATE SHIFT AND NUTRIENT MANAGEMENT
    (2019-07) Sangma, Trudy Tengse A.; Saikia, Luchon
    An experiment was conducted consecutively during 2016-17 and 2017-18 in the Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat to study the “Heat unit indexing of garden pea in relation to climate shift and nutrient management”. The experiment consist three treatments viz., variety (main), fertility management level (sub) and sowing date (sub-sub) laid out in split plot design with random allocation and replicated thrice. The main treatment consisted Arkel(V1), A1(V2), DS-10(V3) and GS-10(V4); sub treatment was comprised of 5t FYM, 10-46-0 kgha-1 (F1), 10t FYM, 10-46-10 kgha-1 (F2), 10t FYM, 20-46-20 kgha-1 (F3) and 10t FYM, 30-46-30 kgha-1 (F4) and sub-sub treatment was dates of sowing: 10th October (S1), 24th October (S2), 7th November (S3), 21st November (S4), 5th December (S5) and 20th December (S6). Growth, yield attributes, soil related and quality characters viz., plant height(cm), days to 50% flowering, pod plant-1, pod length (cm), pod diameter (cm), seed pod-1, shelling (%), pod yield (tha-1), duration (days), growing degree days, root nodules plant-1, total plant nitrogen (%), total plant phosphorus(%), total potash (%), TSS (0 Brix), crude protein (%), soil organic carbon (%), soil available nitrogen (kgha-1), soil available phosphorus (kgha-1), soil available potash (kgha-1) and soil pH have responded significantly due to treatments as well as their interactions, except pH. Variety evidently produced significant effect on growing degree days (GDD) and results showed V4>V3>V2>V1 with requirement of 955, 948, 933 and 833 GDD for 2016-17 and similarly 958, 949, 942 and 825 GDD. The maximum duration was reported as 76.00days in V4F with (1,2,3,4) and S( with 3,4,5). Duration was closely associated with degree days by sowing date had indicated significant duration among varieties, least with V1(58.73days), to maximum in V4(72.30days). Fertility level had a range of maturity at 68.08 to 68.29days. Sowing dates showed significance as 911(S1), 915(S2), 915(S3), 915(S4), 916(S5) and 918(S6) during 2016-17 and the GDD was found significant as S1
  • ThesisItemOpen Access
    INTEGRATED NUTRIENT MANAGEMENT IN PAPAYA (Carica papaya L.)
    (2019-07) MARAK, MINGNAM CH; Borthakur, P. K.
    The present investigation on “Integrated nutrient management on papaya (Carica papaya L.) ” was carried out at the Horticulture Experimental Farm, Assam Agricultural University, Jorhat during the year 2017-2019. The objectives of the present investigation were to find the effect of different integrated nutrients on growth, development, yield, and post-harvest attributes of papaya and to standardize the integrated nutrient model for sustainable production of papaya. The experiment was laid out in randomized block design (RBD) with ten treatments and three replications. The observations were focused on growth characters, physiological attributes, yield, post-harvest attributes and soil status. The growth parameters viz. plant height (186.00cm), stem girth (45.92cm), number of leaf (40.17), total leaf area (10.63m2), number of lobes in leaf (8.50) recorded maximum value when plant were treated with T9:75% (NPK + Vermicompost + FYM + Consortia/plant) during both the year and in pooled analysis. Whereas, the same treatment showed earliness in the initiation of flowering (104.00days), increased number of flowers (82.00) and the lowest height for the first flower (58.67cm). Number of fruits per plant (79.40), average fruit weight (1.75kg), fruit length (25.25cm), fruit diameter (17.91cm), fruit yield per plant (118.68kg) and per ha (366.29t) were also found to be significantly higher in papaya plants supplied with T9:75% (NPK + Vermicompost + FYM + Consortia/plant). Regarding soil parameters, viz. N, P2O5, K2O, (229.22kg/ha, 50.19kg/ha and 128.89kg/ha) were higher in T9:75% (NPK + Vermicompost + FYM + Consortia/plant). Minimum physiological loss in weight (11.01%), titratable acidity (0.017%), higher content of total soluble solids (9.77°brix), total sugars (9.94%), reducing sugars (8.72%), ascorbic acid (23.01mg/100g pulp) and shelf life of fruit (10.17days) were also noted in same treatment i.e. T9:75% (NPK + Vermicompost + FYM + Consortia/plant). The data concerning the economics of present investigation revealed that the maximum net returns of Rs. 13326029.49 with a BCR (2.64) per hectare were obtained with application T9:75% (NPK + Vermicompost + FYM + Consortia/plant). On the basis of results obtained in present investigation, it is concluded that the application of T9:75% (NPK + Vermicompost + FYM + Consortia/plant) resulted in higher economic returns with improvement in soil and fruit quality of papaya cv. Taiwan Red Lady.
  • ThesisItemOpen Access
    MORPHO-BIOCHEMICAL STUDIES OF TEZPUR LITCHI
    (AAU, Jorhat, 2018-07) GOGOI, SUKANYA; Kotoky), U.
    A study was conducted on different varieties of litchi (Litchi chinesis Sonn.) at litchi garden, Porua, Tezpur and Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat during 2016-2018 to have a “Morpho-biochemical studies of Tezpur litchi”. A total of seven varieties with four replications were laid out in a Completely Randomized Design (CRD). The varieties that were taken for investigation were Bombay, Shahi, Piyaji, China, Bilati and Elaichi from Tezpur and Shahi from Jorhat district. The canopy spread of cultivar T2 (Tezpur Shahi) was the highest (15.80m) and lowest (8.65m) in T7 (Jorhat Shahi). Pyramidal, oblong, spherical and elliptical tree shape was observed among the various cultivars of litchi. During the period of investigation, the cultivar T1 (Bombay) took the lowest duration of flowering (18 days) and the highest was recorded in cultivar T5 (Bilati), i.e., 31.50 days. The duration from flowering to harvesting was highest (92.25 days) in T5 (Bilati) and lowest (81.25 days) in T1 (Bombay). The highest fruit weight of 27.79g was recorded in the cultivar T5 (Bilati) which is followed by T4 (China) cultivar (21.88g) and lowest (13.12g) was recorded in T7 (Jorhat Shahi). The highest fruit length of 3.82cm was recorded in the cultivar T3 (Piyaji) and the lowest fruit length (2.97cm) was in T7 (Jorhat Shahi). Fruit circumference showed significant difference among the cultivars where highest (12.40cm) was recorded in T5 (Bilati) and that of lowest (8.70cm) in T7 (Jorhat Shahi). The highest fruit volume (29cc) was recorded in T5 (Bilati) followed by T4 China (24.50cc). Round, cordate, oblong and oval shapes were noticed among the cultivars. The highest aril weight was observed in case of T5 (18.42g) and the lowest was observed in the cultivar T7 i.e., 9.40g. The highest peel weight (4.98g) was recorded in case of Bilati. The highest (6.42) and the lowest (3.07) aril-peel ratio of were observed in case of the cultivar T2 and T7 respectively. The aril thickness was the highest in case of T5 (0.97cm) and the lowest was recorded in T7 (0.47cm). The highest seed weight (3.69g), length (3cm) and diameter (1.27cm) were recorded in T3 (Piyaji) and the lowest values were recorded in T6 (Elaichi). The highest specific gravity of 1.091 was recorded in the cultivar T5 (Bilati) and the lowest (1.036) in T7 (Jorhat Shahi) though their differences among the varieties were found to be non-significant. The variety T4 (China) recorded the highest yield per hectare (48.47t/ha), whereas, the lowest yield (13.92t/ha) was recorded in T7 (Jorhat Shahi). The data on fruit cracking percentage revealed that, the highest fruit cracking (27.22%) was recorded in cultivars T2 (Tezpur Shahi), followed by T3 (Piyaji) and the lowest (12.56%) was in T5 (Bilati). The highest skin strength of 3.21kgcm-2 was recorded in cultivar T5 (Bilati) and T2 (Tezpur Shahi) was found to have the lowest fruit skin strength of 2.48kgcm-2. The highest fruit skin calcium (5.29mg/100g DW) and highest boron content (0.123mg/100g DW) were found in case of the variety T5 (Bilati) and lowest values were in T7 (Jorhat Shahi). Regarding juice content, the highest (18.46cc) was recorded in T5 (Bilati). The cultivar T5 (Bilati) was recorded to have the highest TSS content of 19.77oBrix and the lowest TSS was in T7 (Jorhat Tezpur). The highest titratable acidity (1.65%) was recorded in the cultivar T7 (Jorhat Shahi). Highest reducing sugar (9.86%) and total sugar 17.33% were recorded in the cultivar T5 (Bilati). The cultivar T5 (Bilati) exhibited the highest Vitamin C content of 63.38mg/100g. The highest potassium content (1270mg/100g) was recorded in T5 (Bilati) which was followed by T1 (1105.75mg/100g). The highest anthocyanin content (39.93mg/100g) was recorded in the cultivar T5 (Bilati), whereas, the highest anthocyanin degradation index (4.07) was recorded in the cultivar T7 (Jorhat Shahi). The highest POD (4870.93U/mg protein) and PPO (89.17U/mg protein) specific activity were recorded in T7 (Jorhat Shahi) and that of the lowest values was observed in T5 (Bilati). The highest DPPH inhibition percentage (69.62%) and highest flavonoid content (65.93mg/100g) were recorded in T5 (Bilati). Physiological loss in weight (4.46%) and browning index (243.77) were lowest in T5 (Bilati). Correlation coefficient analysis revealed significant positive correlation of yield with fruit weight, volume, aril weight and canopy spread. The available soil nutrient content of Tezpur was found to be better than that of Jorhat and from this investigation, it can be concluded that, all the litchi varieties of Tezpur were found superior both in quantitative and qualitative characters.
  • ThesisItemOpen Access
    GENETIC DIVERSITY IN BANANA (Musa spp.) GERMPLASM OF ASSAM
    (AAU, Jorhat, 2018) Baruah, Sudeshna; Kotoky, U.
    An experiment was conducted at the Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat to evaluate the huge diversity among the banana germplasm commonly available in the state of Assam. The experiment was laid out in Randomized Block Design with five replications the evaluation was done based on agro-biochemical parameters as well as the genetic diversity present within the genotypes using SSR markers. Based on growth, yield and fruit biochemical characters, the genotypes were clustered with respect to Euclidean distance and also by Trocher’s method. These clusters showed significant differences as compared to the genomic classification of banana. The genotypes were found to show significant diversity based on all the characters and considering all the variations, there were four major clusters found within the 24 genotypes under this investigation. The diploid balbisiana genotypes (Bhimkal and Athiakal) were found to occur in two different solitary clusters, whereas both the culinary genotypes (Kachkal green and white types) consisted a single cluster. The characters like pseudostem height, leaf area, planting to shooting interval, shooting to harvesting interval, crop duration, number of fingers per bunch, fruit weight, fruit volume, number of seeds, pulp: peel ratio, sugar content were found to show high GCV, PCV added with very high heritability and high genetic advance and therefore, these characters were identified to be subjected to improvement by direct selection. After the molecular study using 52 primers, a total of 32 primers were found to produce reproducible bands and 197 alleles were detected by them, of which 170 were polymorphic bands. Percent polymorphism thus obtained was 84.95%. The average polymorphism information content of the primers was 0.437, which was the highest for primer 41(0.913). In the study, a few molecular identities for different genotypes could be identified. A single band sized 400bp, specific to ‘Digjowa’ genotype was found with the SSR27. For both the red bananas considered in the study (Agnisagar and Gobin Tulsi), another specific band sized 250bp was identified with SSR22. The Jaccard’s similarity index was calculated using the molecular marker data and the average similarity index was found to be 0.552, which suggested sufficient diversity present within the genotypes. The maximum similarity based on this was found between ‘Manjahaji, and ‘Barjahaji’. Based on this similarity index, another clustering was done which found two major clusters within the 24 genotypes. In cluster 1, there were two subclusters and in cluster 2, there were three sub-clusters followed by a single genotype (‘Fesa Manohar’). This study had revealed that even among the genotypes belonging to same genomic group, there is sufficient differences based on agro-biochemical parameters and genetic information they carry. Moreover, from this study, the promising genotypes for different characters could be identified on the basis of growth, yield and fruit biochemical characters. Further, on the basis of the present study, efforts can be made for inclusion of more number of primers for even better characterization of the genotypic variability, detailed study for pest and disease resistance and more specifically by including gene specific primers.
  • ThesisItemOpen Access
    Hydroponic systems for growth, development and quality flower production
    (AAU, Jorhat, 2017-07) Sarmah, Ruby; Bora, Sunil
    An investigation was carried out at Department of Horticulture, Assam Agricultural University, Jorhat during the year 2016 to 2017 to find out the best hydroponic system, EC of hydroponic nutrient solution and growing media for quality flower production in Tuberose, Gladiolus and Marigold. The experiment was laid out in two factor completely randomized design with 15 treatment combinations and with three replications comprising of five different levels of hydroponic systems viz. S1 (NFT or Nutrient Film technique), S2 (Water culture system) , S3 ( Aggregate or drip system with coco peat ), S4 (Aggregate or drip system with sand ), S5 (Aggregate or drip system with sawdust) and three different levels of hydroponic nutrient solution concentration viz. N1 (EC 1.0 dS/m), N2 (EC 1.5 dS/m), N3 (EC 2.0 dS/m) and one control (soil and water). Statistical analysis of the data revealed that most of the growth, flowering, root, bulb characters and physiological parameters were significantly influenced due to differences in systems of cultivation, media and nutrient concentrations (EC). Among the various levels of hydroponic systems, S2 (water culture) has shown the best results for most of the growth characters including root, bulb characters and physiological parameters in Tuberose. While, S1 (NFT) was significantly superior in most of the flower characters. The nutrient treatment N3 (EC 2.0 dS/m) has significantly improved all growth parameters except leaf length and plant height which were best in N1 (EC 1.0 dS/m). N3 treatment (EC 2.0 dS/m) was found to be the best in terms of flower and bulb characters including physiological parameters under study. However, the results of root characters were significantly superior in N1 (EC 1.0 dS/m). Hence, S1N3 (NFT + EC 2.0 dS/m) was found to be the best for Tuberose in terms of growth and flowering. In case of Gladiolus, most of the growth characters were found to be significantly superior in S2 (water culture). This treatment was also found to be effective in terms of root, corm and physiological parameters under study. In Gladiolus, a remarkable growth, flowering and corm production was observed in the nutrient treatment N2 (EC 1.5 dS/m). It can be concluded that, the treatment combination S2N3 (water culture + EC 2.0 dS/m) was the most suitable treatment for Gladiolus. In case of marigold, experimental data revealed that the growth and flower characters have shown significant superiority in S1 (NFT). Whereas, S2 (water culture) has shown the best results in root and physiological characters. Among the nutrient treatments, N2 (EC 1.5 dS/m) has shown the best response in marigold in most of the growth characters. Early emergence of bud and flower was noticed in N3 (EC 2.0 dS/m), whereas other flower characters were found to be significantly better in N2 (EC 1.5 dS/m). The root characters of marigold were expressed at its best in N1 (EC 1.0 dS/m) whereas, the physiological characters were found to be significantly improved in N3 (EC 2.0 dS/m). Thus, from the floriculture perspective conclusion can be drawn that treatment combination of S2N2 (NFT + EC 1.5 dS/m) is optimum for quality flower production of marigold. The experimental findings also deduced that for all crops under experiment, S3 (coco-peat) and S4 (sand) are the best media. However, S5 (sawdust) has shown the inferior result among media under study and it was at par with control in most of the observations. The statistical analysis of control vs. rest was shown to be highly significant in most of the observations under study. Thus, it can be concluded that different hydroponic systems, potting media along with their combinations among them exert effect on overall growth, flowering, root, bulb & other physiological parameters in different flowering crops.
  • ThesisItemOpen Access
    MORPHO-BIOCHEMICAL CHARACTERIZATION OF JACKFRUIT (Artocarpus heterophyllus Lam.) TYPES OF ASSAM
    (AAU, Jorhat, 2019-02) Dey, Biswajit; Baruah, Kartik
    Jackfruit (Artocarpus heterophyllus Lam) is an underutilized fruit of Assam. It is mostly grown as backyard crop in homestead garden. The fruit is a good source of energy, vitamins, minerals, flavonoids, etc. Jackfruit is indigenous to the rain forests of the Western Ghats of India. Most jackfruit plants are of seedling origin in the region and thus tend to exhibit a wide range of variability in terms of morphological and biochemical parameters. Therefore, an investigation was undertaken during 2016-2018 on ‘Morpho-biochemical characterization of jackfruits (Artocarpus heterophyllus Lam) of Assam to study the existing variability. One district in each of the six agro climatic zones was chosen and four plants were selected in each district, comprising of twenty four plants. Wide variability was observed among the selected jackfruit accessions for morphological characters. Variability in crown shapes like irregular, elliptical, oblong and spherical were observed. Wide variations in leaf blade shape i.e. elliptic, obovate, oblong, broadly elliptic and narrowly elliptic were recorded in the selected jackfruits. Different fruit shapes like ellipsoid, spheroid, oblong, clavate, oblong and irregular were recorded in the selected accessions. Flake texture and flake flesh colour also showed wide variation. In seeds, different seed shapes such as ellipsoid, irregular, reniform, spheroid and oblong were recorded. Cluster analysis of 23 qualitative characters using Average Linkage Between Groups resulted in grouping of the jackfruit accessions into eight non-overlapping clusters. Cluster I consisted of 6 accessions, Cluster II consisted of 4 accessions, Cluster III consisted of 5 accessions, Cluster IV consisted of 2 accessions, Cluster V consisted of 2 accessions, Cluster VI consisted of 2 accessions, Cluster VII consisted of 2 accessions and Cluster VIII had only 1 accession. The clusters formed did not comprise of accessions based on geographical location indicating that qualitative traits were largely influenced by genetic factors. The quantitative characters of flower, leaf and fruit showed significant variation among the jackfruit accessions. The highest tree height and trunk circumference recorded was 18 m and 198 cm respectively (SON2) and the lowest recorded was in 7 m and 120 cm respectively (CAC3). The number of fruits per tree ranged from 9 to 68 with an average of 26.25. The highest fruit weight among the accessions recorded was 10.89 kg (GLP3) while the highest fruit length was 46.67 cm (SON1). The highest number of flake per kg of fruit recorded was 38.18 (SON4) while the highest weight of flake per kg of fruit recorded was 0.54 kg (SON1). The highest flake seed ratio observed was 7.29 (CAC3) while the highest 100-seed weight recorded was 900g. In terms of biochemical constituents, the highest TSS recorded was 29.70°Brix while the highest TSS: acid ratio recorded was 229.57. The highest total sugar recorded was 26.87% (NAG2) while the highest ascorbic acid content recorded was 14.29 mg/100g (CAC1). The highest crude fibre content recorded was 3.17% and the highest total flavonoid content recorded was 127.45mg QE/100g. The highest antioxidant activity was recorded in accession number CAC1 (80.12%) and the lowest antioxidant activity was recorded in accession number JRT1 (32.46%). The lowest IC50 value was recorded in accession number CAC1 (0.62 mg) indicating high antioxidant potential over all other accessions. The seed biochemical constituents also showed significant variations. The highest seed crude protein content was recorded in accession number SON4 (21.18%), while the highest starch was reported in accession JRT1 (35.30%). The highest total mineral (ash) content was recorded in accession number SON2 (5.18%) and the lowest in accession number KA4 (2.89%). The effect of locations on quantitative characters was found to be non-significant. Fruit length and diameter of jackfruit accessions showed significant positive correlation with fruit weight. A significant positive correlation was also found between fruit weight with number of flakes per kg of fruit and weight of flake per kg of fruit. Among the biochemical parameters, the correlation between ascorbic acid and total antioxidant activity was found to be highly significant.