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生产实践和研究表明,土壤中还原物质积累过多,常是直接或间接导致潜育性水稻土上水稻生长不良和产量较低的原因之一。Fe~(++)又是土壤还原物质的主要成分。因此,我们曾于1981年以施用Fe~(++)、葡萄糖、紫云英的方法,模拟田间土壤还原条件,进行了水稻盆栽试硷,对潜育性水稻土中N素供应特性及N素平衡作了初步研究。试验表明,施入亚铁使水稻明显减产,但却促进了水稻对化肥N素的吸收利用,减少了N素的损失。为了进一步摸清和验证施入Fe~(++)对水稻土中尿素N素平衡的影响,1982年继续进行了这项工作。
Production practices and studies have shown that excessive accumulation of reducing substances in soil often leads directly or indirectly to poor growth and low yield of rice on the surface of paddy soil. Fe ~ (++) is also the main component of soil reducing substances. Therefore, in 1981 we used Fe ~ (++), glucose, and astragalus mongholicus to simulate field soil reduction conditions. Pot experiments were conducted to determine the effects of nitrogen supply on N fertility and N The prime balance made a preliminary study. Experiments show that the application of ferrous iron significantly reduced the yield of rice, but it also promoted the absorption and utilization of nitrogen and nitrogen by chemical fertilizers and reduced the loss of N. In order to further clarify and verify the impact of applying Fe ~ (++) on the balance of urea N in paddy soil, this work was continued in 1982.