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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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20223
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Subject: Plant Breeding × Start date: 2022 × Type: Thesis ×
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    ThesisItemOpen Access
    EFFECT OF SEED COATING WITH VEGETABLE OILS ON SEED GERMINATION AND SEEDLING ESTABLISHMENT IN GREEN GRAM (Vigna radiata (L.) Wilczek) UNDER HIGH SOIL MOISTURE CONDITION
    (AAU, Jorhat, 2022) Jamir, Pursangla; Barua, Purna K.
    Green gram (Vigna radiata L. Wilczek) is an important pulse crop of India and is grown in almost all the states. India is the major producer of green gram in the world. In Assam, it is sown in two seasons, summer (February and March) and kharif (August-September). Kharif sowing generally coincides with the rainy season causing problem in seed germination and seedling establishment. Seed coating is a seed technological technique for enhancing germination and seedling establishment under a wide range of environmental conditions. The present study was carried out to study the effect of seed coating with linseed, castor and mustard oils on green gram seed quality in laboratory conditions and to evaluate the effect of seed coating with these vegetable oils on seedling establishment and crop performance in saturated soil moisture condition in the field. Each of the oils was applied @ 5 ml, 10 ml and 15 ml/kg seed by thorough mixing to impart seed coating. Mustard oil and castor oil treatments were found to improve the seed germination and vigour in the laboratory. In the field, under saturated soil conditions mustard oil and castor oil treatments enhanced field emergence percentage, seedling dry weight, plant height, pod clusters per plant, pods per plant, seeds per pod and seed yield per plant. Linseed oil @10 ml/kg and 15 ml/kg also showed promising performance for seedling dry weight, pod clusters per plant and seeds per pod. In field soil capacity soil condition, linseed and castor oil treatments significantly increased field emergence, plant height, number of branches per plant, pod clusters, seeds per pod and seed yield per plant.
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    ThesisItemOpen Access
    Assessment of seed quality and incidence of aflatoxin in maize during storage
    (AAU, Jorhat, 2022) Baruah, Sulakshana; Sarma Barua, Nagendra
    The present investigation was undertaken to assess the seed quality attributes and incidence of aflatoxin in maize seeds in different treatment combinations at two different storage periods. Equal amounts of seeds of maize composite variety Vivek Sankul Makka-35 were stored in nine different bag-seed treatment combinations consisting of three bags namely, 150micron polyethylene bag (PEB), high density polyethylene interwoven bag (HDPE) and polylined jute bag (PLJB) and three levels of seed treatments viz., turmeric powder @ 20g/ kg of seeds (TP), carboxin 75% WP @ 2.5g/ kg of seeds (carboxin) and control. The seeds were stored up to six months. At three months of storage, PEB gave the most favourable mean performance for germination index, shoot length, seedling length, field emergence, and percent seed infection and it was at par with HDPE for these characters. PEB gave the best mean performance for moisture content, shoot length, seedling dry weight and field emergence at six months of storage. Seeds treated with carboxin 75% WP showed the most favourable mean performances for moisture content, germination index, root length, seedling length, seed vigour index-I, seed vigour index-II, field emergence and percent seed infection at both three and six months of storage. The bag-seed treatment combination of 150 micron polyethylene bag-carboxin 75% WP (PEB-carboxin) gave the best performance than other bag-seed treatment combinations in both three and six months of storage in respect of moisture content, shoot length, seedling dry weight and percent seed infection. PEB-carboxin was found to be appreciably economic as compared to other bag-seed treatment combinations. It was observed from correlation of characters that, with increase in seed moisture content, there was decrease in shoot length, seedling length, seed vigour index-I and seed vigour index-II and increase in percent seed infection at six months of storage. Simple correlation coefficient between two periods of storage i.e., three months and six months, for each character was either significant or highly significant indicating consistent result or trend in increase or decrease of mean performance for a character from three months‟ to six months‟ period. Total aflatoxin concentration in maize seeds was observed to be of less than 3 ppb in six bag-seed treatment combinations while the amount was more in the three control bags at six months of storage. Treatments, thus, were found suitable for getting reduced incidence of total aflatoxin at the end of entire storage period.
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    ThesisItemOpen Access
    Genetics of Brinjal (Solanum melongena L) for Adaptation in Summer Season
    (AAU, Jorhat, 2022) Imsong, Bendangla; Sarma, Akashi
    The present investigation was carried out using twenty three genotypes of brinjal collected from Horticultural Research Station, Kahikuchi, Department of Horticulture, AAU, Jorhat, Tezpur and Mizoram. The experiment was conducted at Horticulture Research Farm, Assam Agricultural University, Jorhat. In the first growing season, the twenty three genotypes were assessed and based on the performance of genotypes and initial plant data, eight lines and three testers were selected and crossed in line x tester mating design to obtain twenty four cross combinations. The parental lines, their cross combinations and a check variety was sown in the second season.The analyses of variance revealed significant variation at genotypic level among the twenty three genotypes for all the sixteen characters except one i.e, fruit length. Between the replication, it was observed that there was significant variation in respect of leaf blade length. The characters, plant spread, fruit circumference, number of fruits per plant, fruit weight, fruit volume and fruit yield per plant had high estimates of both GCV and PCV. High heritability coupled with high genetic advance was observed for the traits, plant spread, fruit circumference, number of fruits per plant, fruit weight, fruit volume and fruit yield per plant. The fruit yield per plant had a significant positive genotypic and phenotypic correlation with plant height, plant spread, number of primary branches per plant, leaf blade length, fruit pedicel length, fruit circumference, number of fruits per plant and fruit weight. There were characters which manifested to be negatively correlated with yield indicating which were days to first flowering, days to 50% flowering, days to first fruiting and days to 50% fruiting. The highest positive direct effect was of days to first flowering (6.064). The genotypic residual effect was observed to be 0.122. The twenty three genotypes were grouped into 5 clusters with cluster I having the maximum number with twelve genotypes. Cluster IV that the highest intra cluster and the inter cluster D2 value was observed to be maximum between cluster III and cluster IV. The highest contribution per cent was manifested for days to 50% flowering. The qualitative characters studied in total were fourteen. From the analysis of variance for line x tester mating design, it was found that the parents, crosses and parents vs crosses exhibited highly significant difference. The analysis of 58 variance of combining ability showed significant difference for the lines, tester and line x tester interaction. Except for the character, plant height, all the other characters exhibited significant difference for line x tester interaction. The estimates of SCA variance were higher than GCA variance which resulted in ratio of σ2GCA to σ2SCA less than one. The proportional contribution of line x tester interaction to total variance was more than the lines and testers. The proportional contribution of lines to total variance was more than testers and line x tester interaction in respect of fruit length and total phenol. Amongst parents, the line Longai Purple Long was observed to be the highest yielder, desirable lowest content of solasodine and exhibited earliness in days to first flowering, days to 50% flowering, days to first fruiting and days to 50% fruiting whereas the tester, KB4 manifested desirable mean for eleven characters which were leaf blade length, days to first flowering, days to 50% flowering, days to first fruiting, days to 50% fruiting, fruit length, fruit weight, fruit volume, fruit yield per plant, phenol content and crude protein. The cross Green Streaked x Balijana showed desirable mean for six traits among all the crosses which were leaf blade width, days to first flowering, days to 50% flowering, days to first fruiting, days to 50% fruiting and solasodine content. The highest yielder was M2 x KB4 among all the twenty four crosses. In regard to good general combining ability of the parents, the line Longai Long was observed to exhibit both positive and negative effects in desired direction for eleven traits. The lines found to be good general combiners for yield were Longai Purple Oblong and Barpeta and for earliness besides Long Long. The cross, HRS4 x Balijana was found to have the maximum number of positive and negative sca effects in favourable trend. The hybrid M2 x KB4 manifested highest average heterosis for fruit yield per plant followed by Longai Long x KB4 and HRS4 x Balijana. The cross M2 x KB4 produced the highest yield.