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1.大豆对氮磷营养的要求不是愈高愈好,而有一定的水平。单施氮肥(硝酸铵)可以提高大豆产量达9.7%,每盆高于1.2克 N 时,增产不明显。单施磷肥(过磷酸钙)提高大豆产量达42.4%,每盆施2.4克P_2O_5以上时,产量不再增加,每盆施4.8克(P_2O_5)时产量出现下降趋势。磷对于大豆的增产作用高于氮肥。氮、磷配合施用在肥力较低条件下效果较为明显。2.株高在75—85厘米者可获得高产,但营养生长进行过于旺盛(N_5水平),各处理产盈反而不高。3.缨济系数超过0.5以上者,常常可以获得高产,而低于此值者常常低产。4.生育后期,由营养器官再分配到荚中的干物质和含氮物质的绝对值与处理关系较少。5.根系的体积,苗期各器官的含氮盈,盛花期茎和叶片中可溶性醣含量与产量有正相关性;盛花期无论正株或各营养器官的相对含氮量与产量有负相关性。
1 soybean nitrogen and phosphorus nutrition requirements are not as high as possible, but have a certain level. Single application of nitrogen fertilizer (ammonium nitrate) can increase the yield of soybean by 9.7%. When the pot temperature is higher than 1.2g N, the yield increase is not obvious. Phosphorus fertilizer alone (SSP) increased the yield of soybean by 42.4%. When the yield was 2.4 g P_2O_5 per pot, the yield did not increase any more. When the yield was 4.8 g P_2O_5 per pot, the yield decreased. The effect of phosphorus on soybean yield is higher than nitrogen fertilizer. Nitrogen and phosphorus application in the lower fertility conditions more obvious effect. 2. Plant height of 75-85 cm can be obtained high yield, but vegetative growth is too strong (N_5 level), the yield of each treatment instead is not high. 3. When the economic value is over 0.5, high yields are often obtained, while those below this level are often low-yielding. 4. In the later period of fertility, the absolute value of dry matter and nitrogenous matter reallocated from vegetative organs into pods has little to do with the treatment. The volume of root system, the nitrogen-containing surplus of all organs at seedling stage, the content of soluble sugar in stems and leaves at full flowering stage had a positive correlation with the yield. There was a negative correlation between the relative nitrogen content of shoots and vegetative organs and yield Sex.