STUDIES ON THE EFFECT OF BIOREGULATORS ON FLOWERING AND YIELD OF MANGO (Mangifera indica L.) cv. BANGANPALLI
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Date
2015-07-30
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COLLEGE OF HORTICULTURE, RAJENDRANAGAR HYDERABAD - 500 030
Abstract
A set of two experiments on the effect of different bioregulators, zinc sulphate (ZnSO4) @ 0.1%, potassium nitrate (KNO3) @ 1%, phosphoric acid (H3PO4) @ 0.5%, potassium di hydrogen ortho phosphoric acid (KH2PO4) @ 1%, (paclobutrazol (PBZ) @ 3ml.m‾1 canopy diameter, napthalene acetic acid (NAA) @ 80 ppm, gibberilic acid (GA3) @ 20 ppm, 1-2-chloro-4pyridyl-3-phenyl urea (CPPU) @ 10ppm, potassium sulphate (K2SO4) @ 1% , their combinations utilizing BBCH scale of mango on flowering, fruit set and yield of mango cv. Banganpalli, was conducted at Fruit Research Station, Sangareddy, Dr. YSRHU, A.P. In two experiments the design adopted was Randomized Block Design with three
replications per treatment. Various vegetative parameters like number of new flushes, internodal length (cm), flowering parameters like days taken for panicle initiation, days taken for 50 per cent flowering and full flower opening, per cent of flowering, panicle length and panicle breadth (cm), and yield parameters like number of days taken for fruit set from panicle initiation, number of fruits panicle-1, number of fruits tree-1, fruit weight (g) and yield (kg tree-1) were recorded.
In the first experiment, mango cv. Banganpalli trees were sprayed with flower bud break enhancing bioregulators and vegetative growth enhancing bioregulators and their combinations. Phosphoric acid (H3PO4) treatment has significantly retarded vegetative growth in terms of decrease in number of new flushes and reduced internodal length when compared to control and other treatments. The combination spray of zinc sulphate + potassium nitrate + potassium di hydrogen ortho phosphoric acid has significantly increased the yield by 19.9% to 38.79 kg.tree-1 over control of 32.3 kg.tree-1. The increase in yield by zinc sulphate + potassium nitrate + potassium di hydrogen ortho phosphoric acid treatment is due to significant increase in fruit set and fruit weight.
In the second experiment, mango cv. Banganpalli trees were sprayed with bio regulators, growth regulators and their combinations. Trees applied with paclobutrazol alone significantly reduced the vegetative growth in terms of minimum number of new flushes and internodal length compared to control trees and other treatments. Paclobutrazol alone and in combinations with other bio regulators significantly minimized the number of days taken for panicle initiation and increased the number of days taken for 50 percent and 100 percent flowering opening, duration of flowering along with increase in percentage of flowering, panicle length and breadth when compare to control trees. However, paclobutrazol and NAA alone are equally effective in significantly increasing the yield by 23.7% and 20.96% over control respectively. The increase in yield by paclobutrazol and NAA is attributed to increase in fruit set and subsequent number of fruits per tree over control.
Description
In two experiments the design adopted was Randomized Block Design with three
replications per treatment. Various vegetative parameters like number of new flushes, internodal length (cm), flowering parameters like days taken for panicle initiation, days taken for 50 per cent flowering and full flower opening, per cent of flowering, panicle length and panicle breadth (cm), and yield parameters like number of days taken for fruit set from panicle initiation, number of fruits panicle-1, number of fruits tree-1, fruit weight (g) and yield (kg tree-1) were recorded.
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Citation
Fruit Research Station, Sangareddy, Dr. YSRHU, A.P.