为研究还田稻草的增产效应及稻草还田后水稻对钾素吸收利用情况，笔者以杂交稻粤杂889和常规稻合丰占为材料，开展了盆栽和大田试验。结果表明，稻草全量还田可以替代50%的化学钾肥，“稻草全量还田+化学钾肥减半”处理比全量施用化学钾肥增产6.55%，达显著水平，增产的主要原因是稻草还田促进了水稻的干物质积累，增加了每穗粒数。%The paper studied the uptake and utilization characteristics of potassium in rice straw returned to field and its effects on grain yield of rice by pot experiment and field experiment with hybid rice Yueza 889 and conventional rice Hefengzhan as experi-ments material. The results indicated that 50%of chemical fertilizer potassium could be saved when all rice straw was returned to the field. Compared to the treatment with 100% chemical potassium application, the treatment with all straw returned plus 50% chemical potassium application obtained 6.55% higher grain yield in average, which was statistically significant, as a result of increased dry matter accumulation and grains per spike.
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