The effects of nitrogen and spacing on the growth and yield of soybean (Glycine max. (L) merr.) under coconut [Sri Lanka]
1982
Martin, P.L.D. (Coconut Research Inst. of Sri Lanka, Lunuwila. Div. of Agronomy)
The effects of nitrogen fertilizer application and spacing on the growth and yield of soyabean (cv. Bragg) grown as an intercrop under a mature stand of coconut in the intermediate zone of Sri Lanka during the north-east monsoonal rainy period are reported. Nitrogen had a significant effect on the seed yield and the number of pods per plant. The highest yield (447.8 kg ha-1) and pod number were recorded at 33.6 kg N ha-1. Nitrogen had no significant effect on plant height, nodule number, Leaf Area Index (LAI), dry matter yield, % protein and % oil in seeds, and yield components other than pod number. Closer row spacings had a significantly larger seed yield, LAI and dry matter yield than wider spacings. Spacing had no significant effect or any of the other attributes studied
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