Fertilizer management strategies to alleviate zinc deficiency in irrigated lowland rice
1992
Laud, D.B.
Across seasons, the basal application of ZnSO4 proved superior over the other treatments in terms of number of grains per panicle, number of filled grains per panicle, weight of filled grains per panicle, weight per 1000 grains, and grain yield per hectare. Its grain yield of 8.8 tons/ha was 16 and 31 percent higher than the other treated plants and the control, respectively. On the average, the dry season crops produced 2.02 to 2.34 times more grain yield than the wet season crop. The addition of basal ZnSO4 and IAA resulted in the production of the tallest plants, heaviest straw yield, and longest panicles. Tiller production was similar in all treated plants. The concentration of nitrogen in grain was least in the control and highest in those which received CF only. Soil treatment did not influence the percentage of P, K, and Zn in both grain and straw. However, in all instances, the concentration of these nutrients in grains was higher than in straw. Total uptake was highest in basal ZnSO4 treatment (191.24 kg/ha) and lowest in the control (121.33 kg/ha). Zinc absorption was highest in the basal ZnSO4 and foliar ZnSO4 with 0.36 and 0.30 kg/ha, respectively. P and K uptake was least in the control. Nutrient removal was in the order of: NKPZn
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