PJB-2007-179
SAP DYNAMICS AND ITS MANAGEMENT IN COMMERCIAL MANGO CULTIVARS OF PAKISTAN
MEHDI MAQBOOL, AMAN ULLAH MALIK* AND ABDUL JABBAR
Abstract
To supply the superior quality mango at international markets require many problems to be surmounted. Different experiments have been conducted to devise a strategy for sapburn management in commercial mango cultivars of Pakistan. In the first experiment, the effect of harvest time of a day and total sap quantity in different cvs of mango was studied. Sap collected from cv Chaunsa was 11.89 times more as compared to cv Sindhri and the quantity of sap exuded early in the morning was greater than later during the day. In the second experiment, it was observed that there is a little effect of delayed de-stemming (after harvest) on sap quantity. However, the total sap quantity was maximum in cv Chaunsa (spurt, 0.77ml & ooze, 0.54ml) and minimum in cv Sindhri (spurt, 0.15ml & ooze, 0.08ml). In the third experiment, three commercial mango cvs were tested against spurt and ooze sap to observe the sapburn susceptibility after 24hrs, 48hrs and 72hrs at two different storage conditions (ambient: 25 ± 1°C; 14°C & 85%RH). Chaunsa cv was the most susceptible followed by cv Sindhri and cv Dusehri. Sapburn incidence in cv Chaunsa were more at ambient temperature (25 ± 1°C) than in cold storage (14°C, RH 85%). However in cvs Sindhri and Dusehri sapburn incidence were almost similar at both the temperatures. In the fourth experiment, level of sapburn severity was studied with reference to harvest time of the day. Sapburn severity increased as daytime proceeded. After 7 days of storage at ambient temperature as well as in cold storage (13 ± 1°C & 80-85% RH) average sapburn severity score was maximum in fruits which were harvested at 3:00 pm (1.08) while minimum in fruits harvested at 8:00 am (0.06). In another experiment fruits were placed on de-sapping trays for different time periods to determine the optimum time of de-sapping to reduce the incidence of sapburn injury. After 15 days of storage (13 ± 1°C & 80-85% RH) minimum sapburn injury occurred in fruits which were placed for 20 minutes (0.65) on de-sapping tray followed by 10 minutes (0.73) as compared with control (2.54) or fruit harvested by traditional method. The results will be used to work out a practical sapburn management approach in commercial mango cvs of Pakistan.
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