ISHS Acta Horticulturae 820: VIII International Mango Symposium
POST-FLOWERING MORPHO-PHYSIOLOGICAL BEHAVIOR OF ALPHONSO MANGO AS INFLUENCED BY PLANT GROWTH REGULATORS, POLYAMINE AND NUTRIENTS UNDER RAINFED CONDITIONS |
| Authors: | M.M. Burondkar, B.B. Jadhav, M.B. Chetti |
| Keywords: | Alphonso mango, chlorophyll, transpiration, stomatal resistance, yield, economics |
| Abstract:
The influence of plant growth regulators (NAA-20 ppm, CPPU-10 ppm, paclobutrazol-10 and 25 ppm), polyamine (putrescine-50 ppm), nutrients (KNO3-1%, K2SO4-1% and Ca-EDTA-0.1%), each sprayed at three stages (full bloom, marble and egg stages of fruit growth), and soil application of paclobutrazol (750 mg/m.c.d), irrigation along with absolute control, was investigated on 32 years old Alphonso mango during 2003-04 and 2004-05 mango cropping seasons in randomized block design with four replications. All the treatments significantly influenced the number of fruits retained at peanut, marble, egg and at harvest stages of fruit growth. Among the treatments, paclobutrazol (25 ppm) and putrescine (50 ppm) were found to have significant influence on all morpho-physiological characters and thereby recorded significantly higher yield (107.7 and 101.74 kg fruits/tree) over control, which was 123.1 and 110.6 per cent higher respectively for paclobutrazol (25 ppm) and putrescine (50 ppm) over control (48.32 kg/tree). Fruit yield was found to be significantly and positively correlated with higher number of fruits retained per panicle at marble, egg and at harvest. Among the treatments, paclobutrazol treatments had significantly higher leaf chlorophyll content, lower leaf transpiration rate and higher diffusive resistance over all other treatments at all the three stage of fruit growth. The size of individual fruit was found to be significantly higher with KNO3 (10.4%) and K2SO4 (11.8%) over control. The maximum cost : benefit ratio was obtained with foliar application of paclobutrazol at 25 ppm (1:6.11) followed by paclobutrazol soil application (1:4.48), KNO3 (1:4.32) and K2SO4 (1:4.25). Although, the fruit yield was maximum with putrescine, due to high cost of chemical, the cost : benefit ratio was lower compared to other treatments. | |
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