【摘要】 应用同位素示踪和大豆结瘤(R_π) 不结瘤(r_π)等位基因系进行氮磷施肥生理基础研究,明确了大豆生育早期主要利用土壤氮和肥料氮,中后期主要利用共生固氮。大豆生育后期由营养器官向籽粒转运的氮素,转运率为50%左右,磷素转运率比氮素高10-20%,合理施用氮肥能够促进豆株对土壤氮的吸收,激发率达1.535-1.778。试验认为早期施用少量氮肥对大豆生育有利,氮磷比以1∶2或1∶3为佳。在135亩中等肥力土壤上连续4年亩产达152-200kg以上。同时研究了夏大豆高产生育指标和9项配套栽培技术。更多还原

【Abstract】 Radiotracer technique has been used to study the physiological basis of NP fertilizer application in summer soybean. It is shown that the N source for the growth of soybean plants during the early growing-stage is mainly the natural soil N and applied fertilizer N, and the symbiotic-fixation N during the middle and late growing-stages. Rate of transportation from vegetative organs into seeds during the late growine-stage was about 50% for N and 60-70% for P. Proper application of N fertilizer could promote the uptake of soil N by soybean plants, with the activating rate being1.535-1.778 A small amount of N applied during the early growing-stage was proved to benefit the growth and development of soybean plants. The optimum N:P ratio was 1:2 or 1:3 Under such ratio, the testing soybean cultivar yielded more than 3000kg/ha on the medium fertility soil (more than 9 hectares). Studied also were the growing and developing criteria for high-yielding summer soybean and 9 sets of the corresponding cultivation techniques.更多还原