Influence of Plant Growth Regulators on Flowering Fruit set Yield and Quality of Acid lime cv Kuliana Citrus aurantifolia Swingle in hot and humid Agro climatic zone of Odisha

Abstract

The present investigation entitled Influence of plant growth regulators on flowering, newlineFruit set, Yield and Quality of Acid lime cv. Kuliana (Citrus aurantifolia Swingle) in hot and newlinehumid agroclimatic zone of Odisha was carried out at OUAT, Udyan Vatika, HRS, OUAT, newlineBhubaneswar, Odisha during the year 2019-2020 and 2020-2021. The objective of the newlineinvestigation was to study the effect of different plant growth regulators on flowering, newlinefruiting, yield and quality of Acid lime cv. Kuliana. The experiment consists of 15 treatments newlineand along with control. The treatments were T1 - 2,4-D at 10 ppm, T2 - 2,4-D at 20 ppm, T3 - newlineGA3 at 5 ppm, T4 - GA3 at 10 ppm, T5 - NAA at 100 ppm, T6 - NAA at 200 ppm, T6 - newlineSalicylic acid (SA) at 100 ppm, T7 - Salicylic acid (SA) at 200 ppm, T9 - Spermidine at newline0.001 mM, T10 - Spermidine at 0.002 mM, T11 - Putrescine at 0.01 mM, T12- Putrescine at newline0.02 mM, T13 - BR at 0.1 ppm T14 - BR at 0.5 ppm and T15 - control. Foliar application of newlinedifferent growth regulators was adopted at three stages viz, pre flowering, flowering stage newlineand fruit set stage. The experiment was laid out in a Randomized Block Design (RBD) and newlinereplicated in twice. newlineThe pooled results of two years of study showed that foliar application of 0.5 % newlineBrassinosteroids (T14) took minimum days to flower bud initiation (41.64 days), days to 50 % newlineflowering (47.96 days), maximum number of clusters per tree (39.89), total number of newlineflowers per tree (875.39), maximum chlorophyll content (65.58 mg/100g), minimum days to newlinefruit set (66.82), fruit set (74.81 %), fruit retention (69.78 %), reduced fruit drop (30.22 %), newlinenumber of fruits per tree (379.02), fruit diameter (4.41 cm), fruit weight (33.71 g), fruit yield newline(12.46 kg/tree), fruit yield (7.79 Mt/ha), juice content (40.42 %), titratable acidity (6.36 %), newlineascorbic acid (33.91 mg/100 g) and carbohydrate content (9.45 %). Application of NAA at newline200 ppm (T6 ) recorded maximum number of flowers per cluster (22.67). Foliar application of newlineGA3 at 10 ppm (T4) recorded minimum number of seeds per fruit (5.97). Hi