Influence of seasonal changes on pollination and effect of chemical on fruit set of 'Nam Dok Mai Tawai' mango (Mangifera indica L.)
1994
Kasem Phuangchik
Study on the influence of seasonal changes on pollination and the effect of chemical treatment on fruit set of ' Nam Dok Mai Tawai' mango at Pakchong Research Station, Kasetsart University. The most successful pollination was in the early season (29-30 Dec. 1992) with 69.5 percent, decrease in the mid season (10-11 Jan. 1993) 65.5 percent and the late season (22-23 Jan. 1993) was the lowest 20.0 percent. The percent of fruits developed till maturity was the highest in the early season (2.23 percent), decrease in the mid season (1.78 percent) and all fruits drop before harvest in the late season. Cross-pollination with cv. Kaew resulted in more harvested fruits than self-pollination. The speed and percentage of pollen germination was higher in those treated with plant growth regulators in Brewbaker's solution by NAA 5 ppm, BA 1, 2.5, 5 ppm and GA3 5 ppm than those of the control. Floral spray with BA 50 ppm twice at the early anthesis and at 50 percent anthesis had the highest fruit set percentage (1.94 percent). Foliar treatment twice with 60 ml/16 liter (v/v) calcium and boron before flowering 1-2 weeks and at 50 percent anthesis resulted in the highest pollen germination percentage (92.9 percent). Sex-ratio, number of fruits that could be harvested and fruit quality were not significant among the treatments. The mango trees treated with plant growth regulators tended to increase pollen germination and fruit set percentage but the results were not significant among the treatments. The highest fruit set percentage was obtained when sprayed with NAA 10 ppm + GA3 20 ppm + Fulmet 20 ppm (1.63 percent). The trees sprayed with growth regulator tended to produce higher number of harvested fruits than the control and the quality of the fruits were not significant among the treatments. Foliar sprayed with Biozyme T.F. 60 ml/20 liter (v/v) gave the highest number of harvested fruits (14.75 fruits/8 inflorescences).
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