Effect of Fertilizer Level and Timing of Hand Weeding on Yield of Upland Rice
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The field experiment was conducted at the Department of Agronomy, Faculty of Agriculture, Chiang Mai University during July-November 1996 to determine the effect of fertilizer level and timing of hand weeding on yield of upland rice var. Sew Mae Jan. Weeds were controlled by hand at 14 days after emergence (DAE), 14 and 21 DAE, 14 and 28 DAE, 14 and 35 DAE, 14, 21 and 28 DAE, and 14, 21, 28 and 35 DAE in different fertilizer levels (0 and 30 kg/rai of 16-20-0 fertilizer). It was found that hand weeding at 14 and 28 DAoE gave higher rice yield compared with hand weeding at 14 and 21 DAE and 14 and 35 DAE. More frequent weeding resultoed in higher yield but the cost of capital and labour should also taken into consideration. Application of fertilizer generally caused higher yield of upland rice.
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