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本文在三种施氮水平上对玉米大豆间作条件下大豆的根瘤形成及固氮等问题进行了研究。结果表明:与单作未施肥大豆相比,三种不同施肥水平上间作大豆的根瘤形成及固氮能力均有所降低,氮肥水平越高,下降越严重;间作条件下,大豆固氮活性的降低大于根瘤数和根瘤重,同样肥力水平下,玉米间作大豆的后茬作物产量显著低于单作大豆的后茬作物产量,而与单作玉米的后茬产量差异不大。与休闲地相比,无论大豆单作还是间作,其后茬产量都显著降低。因此种植大豆不是培肥地力而是消耗土壤肥力。间作大豆对玉米无促进作用,反而使玉米产量下降,对玉米植株含氮量影响不大。间作后作物总产量降低,但蛋白质产量和经济收益明显增加。
In this paper, we studied the nodule formation and nitrogen fixation of soybean under intercropping of soybean and soybean at three nitrogen levels. The results showed that the nodule formation and nitrogen fixation ability of three soybean cultivars were lower than those of single fertilized soybean, while the higher the nitrogen fertilization, the more serious the decline was. Under intercropping, the nitrogen fixation activity of soybean decreased more than that of single nitrogen fertilizer Nodule number and nodule weight. Under the same fertility level, the crop yield of intercropping maize intercropping soybean was significantly lower than that of monocropped soybean, but there was no significant difference between the latter and the latter. Compared with the leisure, regardless of whether a single crop or intercropping of soybean, its crop yields are significantly reduced. So planting soybean does not fertilize fertility but consumes soil fertility. Intercropping soybean did not promote the role of maize, but decreased the yield of maize, and had little effect on the nitrogen content of maize plants. After the intercropping, the total crop yield decreased, but the protein yield and economic benefits increased significantly.