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EFFECT OF BIOREGULATORS, ANTITRANSPIRANTS AND SOIL CONDITIONERS ON GROWTH, YIELD, QUALITY AND SHELF LIFE OF SWEET ORANGE (Citrus sinensis (L.) Osbeck) IN ANDHRA PRADESH
(COLLEGE OF HORTICULTURE VENKATARAMANNAGUDEM, WEST GODAVARI-534101, 2021-01-08) NISSI FLORA GODI; J.Dilip Babu
The present investigation entitled “Effect of bioregulators, antitranspirants and soil conditioners on growth, yield and quality of sweet orange (Citrus sinensis. (L) Osbeck) in Andhra Pradesh” was conducted at citrus research station, Tirupati in Chitoor district and in a farmer’s field in Railway Kodur of Kadapa district during 2018-19 with an aim to increase yield in ambe bahar crop as the changing climate in Andhra Pradesh delays the flowering to February-March instead of December-January under a set of three experiments. The fruits from the above experiment were also evaluated for storage life under ambient conditions on every fourth day for sixteen days from the date of harvest. The first experiment comprises of bioregulators viz., 2,4-D and GA3 along with nutrients like monopotassium phosphate and urea. A novel organic product waste decomposer was also included and all these were compared against farmers practice of spraying urea 1 % + Multi K (Potassium Nitrate) 1 % @ 10 g/l one month after fruit set. Monopotassium phosphate @ 1.5 % + GA3 @ 10 ppm which was sprayed one month before harvest was found to be best for physiological parameters, photosynthetic index, fruit parameters and ascorbic acid. There was no significant difference among the treatments for growth characters. Rind thickness was minimum in fruits from the plants treated with urea @ 1.5 % + GA3 10 ppm one month before harvest. Juice percent was best in urea @ 1 % + 2,4-D @ 10 ppm one month after fruit set. Minimum fruit drop was noticed in trees treated with urea @ 1.5 % + 2,4-D @ 10 ppm one month before harvest. Spraying monopotassium phosphate @ 1 % + 2,4-D @ 10 ppm month after fruit set yielded best quality fruits. Spraying waste decomposer @ 200 l/acre before flowering has improved sweetness index. 2,4-D along with nutrients which was sprayed one month before harvest has enhanced the biochemical characters of the fruits and shelf life at ambient temperature for 16 days. The second experiment involves the spray of antitranspirants like cycocel, salicylic acid, kaolin and liquid paraffin at different concentrations to know their effect against drought stress on growth, yield, quality and especially to control sunburn of citrus fruits. Spraying was done on every fortnightly interval during the dry spell of fruit development i.e. start of summer till onset of rains. The results indicated that, spraying of liquid paraffin @ 1% or 2%, were proved to be best for almost all the parameters like physiological, photosynthetic index, fruit characters, biochemical and this reduced fruit drop and sunburn on fruits due to extreme sunlight. Pre harvest spraying of liquid paraffin @ 1 % has given best results for post harvest quality under ambient conditions. The fruits started spoiling after 8 days of harvest which may be due to regular and frequent spraying of chemicals on fruits which decreased the shelf life of fruits. The third experiment consists of soil conditioners viz., ZEBA hydrogel, pusa hydrogel which were compared over different organic mulches like coconut husk and ground nut husk and inorganic mulch like black polythene to know their effect on fruit growth, yield and quality. Treatments were applied at 70 % evaporation rate of irrigation schedule in the location where soil moisture content was (32.66 %) to (36.66 %) and bulk density (0.71) to (0.79). The results clearly indicated that, ZEBA hydrogel @ 7.5 kg/acre (70 g/plant) followed by Pusa hydrogel @ 2 kg/acre (20 g/plant) over mulching has practically increased water absorption capacity to (68.05 %) and (67.87 %) respectively. The hydrogel addition improved the soil physical characters, physiological character of trees, growth parameters, fruit characters, biochemical characters and post harvest quality of sweet orange.
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EFFECT OF ROOTING MEDIA AND IBA CONCENTRATIONS ON ROOTING OF TERMINAL CUTTINGS IN ACID LIME (Citrus aurantifolia Swingle) cv. BALAJI
(COLLEGE OF HORTICULTURE, VENKATARAMANNAGUDEM, W.G. Dist. – 534 101 ANDHRA PRADESH, 2020-01-10) INDLA AKHIL BABU; Dr. D. SRIHARI
The present investigation on “Effect of rooting media and IBA concentrations on rooting of terminal cuttings in acid lime (Citrus aurantifolia Swingle) cv. Balaji” was carried out during the period from October, 2018 to March, 2019. This trial was conducted in a mist chamber maintained by the farmers at Kadiyadda village, Tadepalligudem mandal, West Godavari District, Andhra Pradesh with an objective of finding out the best type of rooting medium and best treatment of IBA for successful propagation. The terminal cuttings were planted in four types of media viz., coco peat, vermiculite, saw dust and vermicompost and treated with IBA at four concentrations i.e., water (Control), 250 ppm, 500 ppm, 750 ppm, 1000 ppm. The experiment was conducted in Factorial Completely Randomized Design with the above two factors at unequal levels and replicated twice. The study revealed significant differences among rooting media, IBA treatments and their interactions for different root and shoot parameters. Among the four different rooting media, coco peat had performed the best; among the five different IBA treatments, the one at 1000 ppm powder dip method was found best; whereas the combination of these two was observed to be superior among the interactions in respect of different root, shoot parameters and biochemical parameters. The root parameters were significantly influenced by main treatment factors as well as their interactions from 30 days after planting onwards. At 120 DAP, number of roots cutting-1, length of the longest root cutting-1, fresh weight of roots cutting-1 and dry weight of roots cutting-1 were found maximum in those terminal cuttings planted in coco peat and treated with IBA@ 1000 ppm in powder as well as their combination. Similar trend was observed in case of shoot parameters also at 120 days as evident from the results on number of shoots cutting-1, length of longest shoot cutting-1, number of leaves cutting-1, leaf area cutting-1, fresh and dry weight of shoots cutting-1, root to shoot ratio (on dry weight basis), survival percentage of terminal cuttings at 60 and 120 DAP, absolute growth rate, number of days taken to attain a plantable size cutting-1 . The biochemical changes taken place during rooting process were significantly effected by treatments imposed on cuttings. The biochemical constituents viz., carbohydrates and nitrogen increased upto 30 DAP which declined afterwards upto 120 DAP indicating their utilization in the formation of root primordia and development of roots and shoots. From the present investigation, it can be concluded that the terminal cuttings planted in coco peat and treated with IBA@ 1000 ppm in powder form gave pronounced effect on root and shoot formation indicating its effectiveness for propagation in acid lime cv. Balaji.
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STUDIES ON EFFECT OF INTEGRATED NUTRIENT MANAGEMENT ON GROWTH, YIELD AND QUALITY OF STRAWBERRY (Fragaria x ananassa Duch.) cv. CAMAROSA GROWN UNDER SHADE NET CONDITIONS
(College of Horticulture, Venkataramannagudem, Dr.Y.S.R. Horticultural University, 2020-02-15) KARRI CHANDU KARTHEEK REDDY; Dr. D. SRIHARI
The present investigation on“Studies on effect of integrated nutrient management on growth, yield and quality of strawberry (Fragaria X ananassaDuch.) cv. Camarosa grown under shade net conditions” was carried out during Rabi season, 2018-19, under the supervision of the Department of Fruit Science, at College of Horticulture, Venkataramannagudem, Dr. Y. S. R. Horticultural University, West Godavari District of Andhra Pradesh. This experiment was conducted with an objective to study the effect of INM on growth, yield and quality parameters of strawberry cv. Camarosa. The experiment comprised different combinations of inorganic fertilizers, organic manures like FYM, vermicompost and biofertilizers like Arka microbial consortium as 9 treatment combinations in randomized block design. The study revealed the significant differences ingrowth, yield and quality parameters of strawberry. Among the 9 different treatments,75% RDN + 25% N through vermicompost + Arka Microbial Consortium coco peat performed the best. The growth parameters were significantly influenced by various treatments from 30 to 120 DAP.Number of runnersplant-1, crown diameter, number of leaves plant-1,leaf area plant-1, root length andtotal dry matter production plant-1 were recorded maximum in the treatment75% RDN along with 25% N through vermicompost and Arka Microbial Consortium at 30,60,90,120 DAP respectively.The same treatment also recorded lowest plant mortality rate. Maximum NAR was recorded in the treatment 50% RDN + 50% N through vermicompost + Arka Microbial Consortium at 30-60 days interval, 50% RDN + 50% N through FYM at 60-90 days interval and 75% RDN + 25% N through FYM at 90-120 days interval. Highest number of flowers plant-1 , percentage of fruit set, lowest number of days taken to flower initiation and lowest number days to fruiting from date of flowering were also recorded in the treatment 75% RDN along with 25% N through vermicompost and Arka Microbial Consortium. Yield parameters liketotal number of fruits plant-1, fruit diameter, fruit weight,fruit volume, yield plant-1,yield plot-1 andfruit yield hectare-1 were recorded highest in the plants supplied with 75% RDN along with 25% N through vermicompost and Arka Microbial Consortium. Among the quality parameters shelf life , juice recovery percentage,TSS, total sugars, reducing sugars,TSS: Acid ratio,ascorbic acidand anthocyanin content were found to be highest in the treatment 75% RDN along with 25% N through vermicompost and Arka Microbial Consortium. Non- reducing sugars were found to be highest in the treatment 50% RDN + 50% N through vermicompost + Arka Microbial Consortium while titrable acidity was highest in the treatment 50% RDN + 50% N through FYM. Soil nutrient status was more in the treatment 50% RDN + 50% N through vermicompost + Arka Microbial Consortium while nutrient uptake was more in the treatment 75% RDN along with 25% N through vermicompost and Arka Microbial Consortium. From the present investigation, it can be concluded that integrated nutrient management significantly influenced growth, yield and quality characters of strawberry cv. Camarosa and the treatment with 75% RDN along with 25% N through vermicompost and Arka Microbial Consortium recorded highest values in terms of growth, yield, quality parameters and benefit cost ratio.
Unknown
EFFECT OF ROOTING MEDIA AND IBA ON RHIZOGENESIS AND GROWTH OF TERMINAL CUTTINGS IN BER (Ziziphus mauritiana Lamk) Cv. APPLE BER
(COLLEGE OF HORTICULTURE,VENKATARAMANNAGUDEM W.G. Dist. – 534 101 ANDHRA PRADESH, 2019-10-19) MAHESH S S N MOKHAMATLA; Dr. A. HARSHAVARDHAN
The present investigation entitled “Effect of rooting media and IBA on rhizogenesis and growth of terminal cuttings in ber (Ziziphus mauritiana Lamk) cv. Apple ber” was carried out during the period from October, 2018 to March, 2019 under the supervision of the Department of Fruit science, College of Horticulture, Venkataramannagudem. This trial was conducted in a mist chamber available at Kadiyadda village, Tadepalligudem mandal, West Godavari District, Andhra Pradesh with an objective of finding out the best type of rooting media, IBA concentrations and methods of application for successful propagation. The terminal cuttings were planted in three types of media viz., coco peat, vermiculite and saw dust, treated with IBA at three concentrations i.e., 1000 ppm, 1500 ppm and 2000 ppm. Methods of application two types i.e., cuttings treated with mixture of IBA and talcum powder and cuttings treated with IBA solution for 5 minutes. The experiment was conducted in Factorial Completely Randomized Design with the above three factors at unequal levels and replicated thrice. The study revealed that significant difference among rooting media, IBA concentrations, methods of application and their interactions for different root and shoot parameters. Among the three rooting media, coco peat performed superior for different root and shoot parameters. Among the IBA concentrations and methods of application, the one at 1000 ppm with IBA solution for 5 minutes method was found to be superior among the interactions in respect of different root and shoot parameters. The root parameters were significantly influenced by main treatment factors as well as their interactions from 60 days after planting onwards. At 120 DAP, number of roots per cutting, length of the longest root per cutting, fresh weight of roots per cutting and dry weight of roots per cutting were found to be maximum in those terminal cuttings planted in coco peat media, IBA @ 1000 ppm and cuttings treated with IBA solution for 5 minutes as well as their combination. Similar trend was observed in case of shoot parameters also at 120 days as evident from the results on number of shoots per cutting, length of longest shoot per cutting, number of leaves per cutting, fresh and dry weight of shoots per cutting, root to shoot ratio (on dry weight basis). Percentage of rooted cuttings during hardening process, days to first sprouting of terminal cuttings at 45 and absolute growth rate and days taken for plantable size at 90 days after planting were recorded. From the present investigation, it can be concluded that the terminal cuttings planted in coco peat media, IBA @ 1000 ppm and cuttings treated with IBA solution for 5 minutes gave pronounced effect on root and shoot formation indicating its effectiveness for propagation in ber cv. Apple ber .
Unknown
“STUDIES ON COMBINED INFLUENCE OF PRUNING AND EXOGENOUS APPLICATION OF GROWTH REGULATORS ON FLOWERING AND FRUITING BEHAVIOUR OF SWEET ORANGE (Citrus sinensis Swingle) cv. SATHGUDI”
(COLLEGE OF HORTICULTURE ANANTHARAJUPETA -516 105, YSR KADAPA DISTRICT ANDHRA PRADESH, 2019-09-19) DUPATI ASHOK KUMAR; Dr. V.N.P. SIVA RAMA KRISHNA
A field investigation entitled “Studies on combined influence of pruning and exogenous application of growth regulators on flowering and fruiting behaviour of Sweet Orange (Citrus sinensis Swingle) cv. Sathgudi” was conducted at Fruit science block, sweet orange orchard, College of Horticulture, Anantharajupeta, Dr. Y.S.R.H.U. during the year of 2018-19. The experiment was laid out in factorial randomized block design with twelve treatments with single control and replicated thrice. This interaction study was conducted with three major objectives viz, to analyze the combined influence of pruning and exogenous application of PGRs on vegetative growth, initiation of flowering, on fruiting behavior, fruit yield and quality in sweet orange. Among the different interaction treatments tested, to initiate flowering, improve behavior and quality improvement in sweet orange (Citrus sinensis Swingle) cv. Sathgudi, T2 (P1C2 – Pruning 10 cm + NAA @ 100 ppm) recorded less number of days taken for flowering, more number of flowers per shoot, maximum flowering percentage, highest flower retention percentage, maximum fruit set percentage, more number of fruits per shoot, more number of fruits per tree, minimum fruit drop percentage, highest fruit yield per tree, less peel to pulp ratio, highest juice content, maximum total soluble solids, low titrable acidity, more ascorbic acid content and maximum total sugars content. Maximum shoot length and fruit length were recorded in T4 (Pruning 10 cm + GA3 @ 100 ppm). Maximum fruit volume was noticed in T1 (Pruning 10 cm + NAA @ 50 ppm). Minimum number of seeds per fruit was observed under T11 (Pruning 15 cm + 2% KNO3). Maximum fruit weight and highest reducing sugars content were recorded in T9 (Pruning 15 cm + GA3 @ 50 ppm). Highest fruit volume and maximum fruit diameter were measured under T1 (Pruning 10 cm + NAA @ 50 ppm). Less peel thickness and minimum peel weight were noticed under T12 (Pruning 15 cm + 3% KNO3). It can be concluded from the present study, those among all the interaction treatments, T2 (P1C2 – Pruning 10 cm during the second week of September + NAA @ 100 ppm in two sprays during October at fortnightly intervals) was the best for early flowering, fruit growth and development and quality parameters of sweet orange.
Unknown
EFFECT OF DIFFERENT GROWING MEDIA AND GA3 CONCENTRATIONS ON SEED GERMINATION AND SEEDLING GROWTH OF JAMUN (Syzygium cumunii L. Skeels)
(COLLEGE OF HORTICULTURE Dr. Y. S. R. HORTICULTURAL UNIVERSITY VENKATARAMANNAGUDEM, WEST GODAVARI – 534 101, 2019-08-13) PYDI LEPAKSHI; Dr. P. VINAYA KUMAR REDDY
The study entitled “Effect of different growing media and GA3 concentrations on seed germination and seedling growth of Jamun (Syzygium cumunii L. Skeels)” was carried out at College of Horticulture, Dr. Y.S.R Horticultural University, Venkataramannagudem, West Godavari District, AndhraPradesh, during the year 2018-19. Media was taken at four levels (Soil, Soil + cocopeat @ 1:1, Soil + vermicompost @ 1:1, Soil + cocopeat + vermicompost @ 1:1:1) and GA3 at four levels (control (0 ppm), 100, 200 and 300 ppm) with 16 treatment combinations which were replicated thrice. Germination parameters like early initiation of germination, less days to 50 percent germination and higher percent of germination was observed at 15 and 30 DAS in pretreated seeds with GA3 @ 300ppm and sown in the media comprising of soil, cocopeat and vermicompost. The growth parameters like height, number of leaves, girth, chlorophyll content, length of root, number of secondary roots per seedling, fresh and dry weight of the shoot, fresh and dry weight of the root, vigour index I, vigour index II and root: shoot ratio at 150 days after sowing were found to be high in seeds treated with GA3 @ 300 ppm and sown in media comprising of soil, cocopeat and vermicompost over the untreated seeds sown in soil. Similarly nutrient uptake was found to be high in seedlings treated with GA3 @ 300 ppm and sown in media comprising of soil, cocopeat and vermicompost in the ratio of 1:1:1 where as lowest was observed in the untreated seeds sown in soil.
Unknown
STUDIES ON THE PERFORMANCE OF DIFFERENT VARIETIES OF STRAWBERRY (Fragaria × ananassa Duch.) GROWN UNDER SHADE NET HOUSE
(COLLEGE OF HORTICULTURE, VENKATARAMANNAGUDEM, WEST GODAVARI – 534 101 ANDHRA PRADESH, 2019-08-18) DHARSHANA N S; Dr. P. Vinaya Kumar Reddy
The present investigation on “Studies on the performance of different varieties of strawberry (Fragaria x ananassa Duch.) grown under shade net house” was carried out during 2018-2019 at COH, Venkataramannagudem, West Godavari district with the objective of studying the performance of different varieties of strawberry, estimating the variability and heritability besides studying the character association. Observations were recorded on vegetative, yield and biochemical parameters in each variety. A total of ten strawberry varieties viz., Winter Dawn, Sweet Charle, Barak, Hadar, Sabrina, Yasmin, Tamir, Shani, San Andreas and Festival which were arranged in randomized block design as separate experiments. Mean performance studies revealed that mean plant height, number of runners per plant, fruit length, fruit yield per plot, fruit yield per hactare, no reducing sugar, total sugars and anthocyanin recorded highest in Winter Dawn. Number of leaves, leaf area, and plant spread highest recorded in Sabrina. Festival recorded highest mean in fruit volume, number of fruits per plant, fruit yield per plant and also earliest to produce flowers. Sweet Charle took minimum number of days to fruit maturation after flowering, and recorded highest mean in fruit diameter, total soluble solids. Low acidity found in Shani, whereas maximum ascorbic acid recorded in Yasmin. Highest mean for ascorbic acid and total soluble solids to acidity ratio recorded from Barak. The estimates of phenotypic variance were higher than those of genotypic variance for all the traits indicating the influence of environment in their expression. High heritability coupled with high GAM was observed for, Plant height, number of leaves per plant, leaf area, number of runners per plant, days taken for flower initiation, number of flowers per plant, number of fruits per plant, fruit weight, fruit volume, Ascorbic acid, TSS, and fruit yield per plant. Thus indicating the preponderance of additive gene action governing the inheritance of these characters offering the best possibility of improvement through simple selection procedures in strawberry. Correlation coefficients among yield and its component characters are statistically computed for fifteen characters to know the direction and extent of association among them. Number of leaves per plant recorded significant positive association with yield per plant. Highly significant positive association was found with number of flowers per plant, fruit length, fruit diameter, fruit weight, fruit volume and number of fruits per plant. Estimation of cost benefit ratio revealed that highest cost benefit ratio obtained from winter dawn.
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RESPONSE TO EXOGENOUS APPLICATION OF SALICYLIC ACID AND MICRO NUTRIENTS ON GROWTH AND YIELD PARAMETERS OF PAPAYA cv. RED LADY
(COLLEGE OF HORTICULTURE, ANANTHARAJUPETA, Y.S.R. KADAPA Dist– 516 105 ANDHRA PRADESH, 2019-07-26) A. SUMALATHA; Dr. M. RAMA KRISHNA
A field experiment on “Response to exogenous application of salicylic acid and micro nutrients on growth and yield parameters of papaya cv. Red Lady” was conducted at College of Horticulture, Anantharajupeta, YSR Kadapa Dist, Andhra Pradesh during 2018-2019. The experimental plot was laid out in split plot design comprising 3 levels in main plot and 4 levels in subplot with 3 replications. The experiment consists of salicylic acid with two concentrations (1.0 mM, 2.0 mM), ZnSO4 (0.25%) and boron (0.1%). The treatments comprising salicylic acid was applied at 45,90,135,180 days of planting while Zn and B was sprayed at 55,100,145,190 days of planting. The results of the experiment revealed that foliar application of salicylic acid at 2.0 mM and micronutrient ZnSO4 at 0.25% + Boron at 0.1% (M2S3) significantly influenced the growth, floral, fruit, yield and biochemical parameters of papaya cv. Red Lady compared to untreated control. Application of salicylic acid at 2.0 mM and micronutrient ZnSO4 at 0.25% + Boron at 0.1% (M2S3) resulted in maximum plant height (78.23 cm,137.66 cm,166.73 cm at 75 DAP, 150 DAP and at first harvest respectively), maximum stem girth (3.83 cm, 21.23 cm, 39.26 cm at 75 DAP, 150 DAP and at first harvest respectively), highest number of leaves per plant (15.36, 22.97, 39.23 at 75 DAP, 150 DAP and time of first harvest respectively) and highest SCMR values at 75 DAP (48.33),150 DAP (49.41) and time of first harvest (42.70). Least number of days taken for first flower bud initiation (104.22) and days to first harvest of fruits (242.60) was observed in plants treated with salicylic acid @ 2.0 mM and ZnSo4 @ 0.25% + boron @ 0.1 % (M2S3), highest number of days taken in untreated control plot. Pertaining to yield and yield attributing characters, application of M2S3 (salicylic acid @ 2.0 mM and ZnSo4 @ 0.25% + boron @ 0.1 %), recorded highest fruit yield / plant (49.43 kg), maximum number of fruits per plant (37.51) fruit weight (1.55 kg), fruit length (22.68 cm), fruit girth (15.16 cm), shelf life (8.48 days) whereas, lowest values was observed in untreated control plot. With regard to quality parameters, maximum TSS (13.700B), ascorbic acid (23.65mg/100g), total sugars (10.83%), carotenoid content (89.23mg/100 g) and minimum titrable acidity (0.18 %) was recorded with treatment M2S3 (salicylic acid @ 2.0 mM and ZnSo4 @ 0.25% + boron @ 0.1 %). Papaya leaf is tested for nutrient concentration, it is revealed that higher concentration of N (3.85 %), P (0.54 %), K (5.75 %) was observed in treatment M2S3, Zn (31.29 ppm) was observed in treatment M2S1 and Boron (23.74 ppm) was observed in treatment M2S2. With regards of post-harvest soil analysis, the effect of main plot treatments, subplot treatments and their interaction of post-harvest soil available of N,P,K was non-significant during the crop growth. The plants which were sprayed with 2.0 mM salicylic acid, 0.25% ZnSO4 and 0.1 % boron have shown minimum (46.63 %) incidence of Papaya Ring Spot Virus (PRSV). Whereas, the maximum disease incidence was found in M3S4 (control).
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STUDIES ON THE EFFECT OF TIME AND LEVELS OF PRUNING IN GUAVA (Psidium guajava L.) cvs. TAIWAN WHITE AND TAIWAN PINK GROWN UNDER HIGH DENSITY PLANTING SYSTEM FOR GROWTH, YIELD AND QUALITY OF FRUITS
(COLLEGE OF HORTICULTURE VENKATARAMANNAGUDEM – 534 101, WEST GODAVARI DISTRICT, 2019-08-03) ANUSHA N M; Dr. D. SRIHARI
An investigation with a title “Studies on the effect of time and levels of pruning in guava (Psidium guajava L.) cvs. Taiwan White and Taiwan Pink grown under high density planting system for growth, yield and quality of fruits” was carried out during June,2018 to January, 2019 in guava orchard at College of Horticulture Dr.Y.S.R. Horticultural University, Venkataramannagudem, West Godavari District of Andhra Pradesh. The objective of the investigation is to study the effect of time and levels of pruning on growth, yield and quality parameters. The experiment was laid down in a factorial randomized block design with two replications and eighteen treatment combinations with three factors viz., V1-Taiwan Pink, V2- Taiwan White; D1- pruning on 15th June, D2-pruning on 30th June, D3-pruning on 15th July; P1- heading back up to 4th node, P2- heading back up to 6th node; P3-heading back up to 8th node. Data on the effect of pruning on growth, yield and quality parameters were recorded and statistically analysed. Growth parameters were significantly influenced by varieties, time and levels of pruning and their interactions. Among varieties, Taiwan Pink recorded maximum number of new shoots (17.48) and number of new productive shoots (9.93) at 180 DAP, whereas Taiwan White recorded maximum length of productive shoot (30.42cm) and unproductive shoot (37.07cm), girth of new productive shoot (0.699 cm) and unproductive shoot (0.612 cm), number of leaves per productive shoot (23.86) and unproductive shoot (16.28), leaf area per productive shoot (1211.27 cm2 ) and unproductive shoot (836.90 cm2 ), LAD of productive shoot (40.30 cm2 ) and unproductive shoot (27.03 cm2 ) at 180 DAP. Taiwan Pink recorded early flower initiation (26.56), days to 50 per cent flowering (54.54), more number of flowers per shoot (5.65) and fruit set percent (63.03 %). Among different times of pruning, pruning on 15th June at 180 DAP recorded more number of new shoots (16.95) and productive shoots (9.72), length of productive shoot (30.10cm) and unproductive shoot (36.56 cm), girth of productive shoot (0.656cm) and unproductive shoot (0.62 cm), number of leaves per productive shoot (23.37), leaf area per productive shoot (1282.38 cm2 ) and unproductive shoot (824.82 cm2 ), LAD of productive shoot (39.51 cm2 ) and unproductive shoot (26.61 cm2 ), early flower initiation (24.75), days to 50 per cent flowering (53.63), more number of flowers per shoot (6.30) and fruit set percent (65.18%).Among different levels of pruning, heading back up to 6th node recorded more number of new shoots (16.83) and productive shoots (9.46), leaf area of productive shoot (1181.62 cm2 ), early flower initiation (26.83) and more fruit set per cent (62.32 %). Heading back up to 4th node recorded maximum number of leaves per productive shoot (21.92) and unproductive shoots (15.71), girth of unproductive shoot (0.633 cm), leaf area of unproductive shoot (795.43 cm2 ), LAD of productive (36.53 cm2 ) and unproductive shoot (25.45 cm2 ), minimum days to 50 % flowering (56.79) and more number of flowers per shoot (5.7). Among interaction effects, Taiwan Pink pruned on 15th June up to 6th node recorded maximum number of new shoots (17.40) and productive shoots (10.35), less days to flower initiation (22.00), minimum days to 50 per cent flowering (49.60), more number of flowers per shoot (7.23) and fruit set per cent (73.27 %). Significant differences were observed among varieties, time and levels of pruning with respect to yield parameters. Among varieties, Taiwan Pink recorded more number of fruits per plant (50.02) , whereas Taiwan White recorded more fruit yield per plant (11.71 kg), fruit yield per hectare (16.10 t), fruit diameter (8.01 cm) and fruit length (7.22 cm), average fruit weight (343.94 g), fruit volume (318.61 cm3 ).Among different times of pruning, pruning on 15th June recorded maximum number of fruits per plant (45.71), fruit yield per plant (13.21 kg), fruit diameter (7.60cm), fruit length (6.87 cm), average fruit weight (298.00gm) and fruit volume (283.92 cm3 ).Among different pruning levels, heading back up to 6th node recorded maximum number of fruits per plant (42.48), fruit yield per plant (11.53 kg), fruit yield per hectare (15.84 t) and fruit length (6.87 cm). Among interaction effects, Taiwan White pruned on 15th June up to 4th node recorded maximum fruit yield per plant (16.16 kg), fruit yield per hectare (22.17 t), fruit diameter (8.33 cm), fruit length (7.83 cm), average fruit weight (373.50 g) and fruit volume (345 cm3 ). Quality parameters exhibited significant difference among varieties, time and levels of pruning. Among varieties, Taiwan Pink recorded maximum total sugars (7.87%), TSS (9.97 0Brix), TSS/ acid ratio (25.93), Physiological loss in weight (7.46 %). Taiwan White recorded maximum titratable acidity (0.56%), ascorbic acid (255mg/100g pulp) and shelf life (9.51).Among different pruning dates, pruning on 15 th July recorded maximum TSS (9.78 0Brix), TSS/acid ratio (24.53), ascorbic acid (248 mg /100g pulp) and physiological loss in weight (7.19%).Among different levels of pruning, heading back up to 8th node recorded maximum TSS (9.44 0Brix), TSS/acid ratio (21.62), ascorbic acid (247 mg/100g pulp) and physiological loss in weight (7.07 %).Among interaction effects, Taiwan Pink pruned on 15th July up to 8th node recorded maximum TSS (10.85 0Brix), TSS/acid ratio (33.78), total sugars (8.0%) and physiological loss in weight (7.85 %). On the basis of results obtained in the present study, effect of time and levels of pruning in guava cvs. Taiwan White and Taiwan Pink , Taiwan Pink pruned on 15th June up to 6th node responded best to pruning with more flowers, fruits and fruit set percentage and quality parameters, whereas Taiwan White pruned on 15th June up to 4th node was found best with respect to growth parameters and yield per hectare due to more average weight of fruit than Taiwan Pink.

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