Effects Of Soil Nitrogen Levels On Nitrogen Uptake And Yield Of Soybean

Soybean high nutritional value, contains high-quality protein, vitamins, calcium, fatty acids. In soybean seed, about 40% protein, about 20% fat, about 30% to 33% carbohydrate, and contains a lot of minerals and vitamins, due to their high nutritional value, is the human life of plants an important source of protein and vegetable oil. Soybean Nitrogen source has three parts are: nitrogen fertilizer, soil nitrogen and nitrogenase. Soil nitrogen supply is a basic nitrogen source soybeans, which directly affects the level of accumulation and soybean production levels of nitrogen.Therefore, soil nitrogen levels affect system research on soybean yield and nitrogen accumulation of theoretical and practical significance, provide important theoretical basis and reference for soybean reasonable application of nitrogen fertilizer.The trial in the Northeast Agricultural University XiangFang botany experiment and practice bases in 2014, the use of plant cultivation method box method, the choice of Heihe 49, Jiyu 47 two soybean varieties as tested materials. Box planted test set N0, N5, N10, N15 four soil nitrogen levels processing, to ensure that the whole growth period differences in soybean available nitrogen, nitrogen chase with phased quantitative methods. Study the soil nitrogen levels of dry matter accumulation of soybean plants, affecting nitrogen content, nitrogen accumulation and grain yield components. The results showed that:(1) soil nitrogen levels have a certain impact on plant nitrogen content. Nitrogen content in vegetative organs show two soybean varieties tested for, with the improvement of soil nitrogen levels and increasing trends, especially the seedling stage(V3) performance is particularly evident. R4 pod nitrogen content in the beginning has been on an upward trend. Increase soil nitrogen levels can increase the nitrogen content of soybean pod. Heihe on 49 cultivars Jiyu 47 is greater than the rate of increase.(2) soil nitrogen levels have an impact on plant nitrogen accumulation. Two soybean varieties tested in various organs accumulated nitrogen nutrients throughout the growing period of soybean increases soil nitrogen levels increased and showed a single peak curve, N accumulation in the order of: N15> N10> N5 > N0.(3) soil nitrogen levels have a certain impact on plant nitrogen distribution. Two cultivars at the seedling stage(V3) leaves, roots with increasing nitrogen distribution of soil nitrogen levels and lower stems, nitrogen distribution shank with increasing soil nitrogen levels and increased; in R5 stage, harvest was not obvious. Description soil nitrogen levels greater impact on seedling stage(V3) of nitrogen allocation.(4) the accumulation of soil nitrogen levels have a certain impact on the soybean plant dry matter. Two cultivars in the whole growth period, with the increase of the amount of dry matter accumulation of soil nitrogen levels and increased dry matter accumulation harvest size: N15> N10> N5> N0. Description nitrogen fertilizer can significantly increase the amount of dry matter accumulation of soybean plants.(5) soil nitrogen levels on yield of soybean plants. In the harvest period, yield 49 varieties of Heihe size for each treatment: N15> N10> N5> N0, N15 and N10 processing treatments were not significant, indicating that excessive amounts of nitrogen fertilizer did not significantly increase the yield of early maturing varieties of soybeans; Jiyu size 47 varieties yield for each treatment: N15> N10> N5> N0, significant differences among treatments, indicating that the amount of nitrogen fertilizer with soybean production increased late-maturing varieties has increased.