ISHS Acta Horticulturae 820: VIII International Mango Symposium
EFFECT OF PLANT GROWTH REGULATORS, POLYAMINE AND NUTRIENTS ON FRUIT QUALITY AND OCCURRENCE OF SPONGY TISSUE IN ALPHONSO MANGO |
| Authors: | M.M. Burondkar, B.B. Jadhav, M.B. Chetti |
| Keywords: | sugars, ascorbic acid, acidity, PLW, fruit size |
| Abstract:
Investigations were undertaken for two consecutive seasons (2003-04 and 2004-05) to find out the effect of plant growth regulators, polyamine and nutrients on fruit quality and occurrence of spongy tissue on 32 years old Alphonso mango trees. The experiment consisted of eleven treatments comprising foliar application of NAA (20 ppm), CPPU (15 ppm), paclobutrazol (10 and 25 ppm), polyamine (putrescine-50 ppm), KNO3 (1%), K2SO4 (1%) and Ca-EDTA (0.1%) at full bloom, marble and egg stages and soil application of paclobutrazol (750 mg/m.c.d.) four months prior to full bloom. In addition, experiment had irrigation and control treatments. The experiment was laid out in randomized block design with four replications. Data of two seasons were compiled and subjected for pooled analysis. Results indicated that among the treatments, both the sources of potassium (KNO3 and K2SO4) resulted in a significant enhancement of fruit size in terms of fruit weight (277.78 g and 274.34 g), which was 11.8 and 11.4% higher over control (248.40 g), respectively. These nutrient treatments also recorded significantly higher TSS (19.9 and 19.7°B) and reducing sugars (7.92 and 7.59%) over other treatments and control (16.8°B and 6.17%). While, the ascorbic acid content was significantly higher with Ca-EDTA (49.68 mg/100 g) followed by KNO3 (48.37 mg/100 g). The total sugars were found to be higher with K2SO4 (17.04%) followed by KNO3 (16.85%), which were 14.1 and 12.8 per cent higher over control (14.94%), respectively. The physiological loss in weight (PLW) was significantly lower in 25 ppm paclobutrazol foliar spray (19.7%) and soil application of paclobutrazol (19.8%) and K2SO4 (19.8%) as compared to control (23.9%) and irrigation (25.5%). The incidence of spongy tissue was found to increase with an increase in fruit maturity from B to C and D stages of maturity in all the treatments. Among the treatments, all the three paclobutrazol treatments registered significantly lower incidence of spongy tissue at ‘B’ (2.28- 6.78%), ‘C’ (3.22-8.21%) and ‘D’ (41.71-41.78%) stages of maturity, which accounted for (62.0-87.2%, 64.8-86.2 and 27.6-35.5%) lower incidence, respectively compared to control (17.85 23.2 and 64.6%, respectively) at B, C and D stages. | |
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