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稻秆其干物质量约占水稻整个生物产量的405左右。它含有丰富的有机质、大量的钾、硅以及一定数量的氮磷养分。在农业生产中,利用稻秆还田或制成堆肥,垫圈后再还田来培肥地力。为了研究稻秆还田后短期及长期的增产效果,土壤地力变化,尤其是稻秆还田对植株钾索营养,土壤钾素平衡的影响,我们进行了为期三年的定位试验。现将结果简述如下:一、对水稻产量的影响在粉砂质水稻土上,三年稻秆还田每年均表现增产。全部稻秆还田,亩增稻谷46—68斤.增产率为6.3—9.7%;半量稻秆还田,亩增稻谷30斤左右,增产率3.3—6.9%。这表明
The dry matter of rice straw accounts for about 405 of the total biological yield of rice. It is rich in organic matter, a large amount of potassium, silicon and a certain amount of nitrogen and phosphorus nutrients. In agricultural production, the use of rice straw or made of compost, wasp and then back to field fertility. In order to study the effects of short-term and long-term yield increase after rice straw returning to soil and soil fertility, especially the effect of straw returning on potassium nutrition and soil potassium balance, we conducted a three-year positioning experiment. The results are briefly described as follows: First, the impact on rice yield In the silty paddy soil, three years of return to rice stalks show an increase in yield each year. All rice straw returning to the field, mu by 46-68 kg of grain. Yield increase of 6.3-9.7%; half of the amount of rice straw, acres of rice by about 30 kg, yield 3.3-6.9%. This indicates