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大豆高产必需施用一定数量氮肥,不能依赖根瘤菌固定氮素作为唯一氮源。但施用氮肥又会影响结瘤和固氮,二者互有矛盾。为探讨解决这一矛盾,我们就氮肥的不同施用时期对大豆根瘤和大豆产量的影响作了初步研究,目的在于找出氮肥的施用适期。材料和方法供试大豆品种为威来姆斯,试供土壤为黄泥底紫泥田,农化性状如下:有机质2.08％,全氮0.116％,全磷(五氧化二磷)0.134％;速效磷53.5PPM,速效氮131.1PPM,速效钾63PPM,pH5.72。试验设置七个处理:其中六个施氮肥处理,从出苗后第10天开始,每隔10天为一期;另一个处理为不施氮肥的对照。全部处理各亩施氯化钾20斤,过磷酸钙30斤。六个施氮肥
Soybean high yield must apply a certain amount of nitrogen fertilizer, can not rely on Rhizobium fixed nitrogen as the only nitrogen source. However, the application of nitrogen fertilizer will affect nodulation and nitrogen fixation, the two contradictory. In order to explore and solve this contradiction, we conducted a preliminary study on the effects of different application periods of nitrogen fertilizer on soybean nodules and soybean yield with the purpose of identifying the appropriate period of nitrogen fertilizer application. MATERIALS AND METHODS The soybean cultivars tested were Wilms, and the soil samples were yellow muddy purple soil with the following agronomic characters: 2.08% of organic matter, 0.116% of total nitrogen and 0.134% of total phosphorus (P2O5) 53.5 PPM, available nitrogen 131.1 PPM, available potassium 63 PPM, pH 5.7 2. Seven treatments were set up for the experiment: six of them were treated with nitrogen fertilizer, one period every 10 days from the 10th day after emergence and the other one was the control without nitrogen fertilizer. All treatment of 20 acres of potassium chloride per acre, superphosphate 30 pounds. Six nitrogen fertilizer