Effects of plant density on carbon and nitrogen metabolism, yield and quality of soybean cultivar Kennong 4 were investigated in field. The results showed that nitrogen, soluble protein, starch and cane sugar accumulation increased gradually with the increase of plant density, and there was significant difference among different density of soybean populations; With the increase of density, the proten content in soybean seed increased but fat content decreased;Through analyzing correlation at each stage, we known that there was a negative correlation among nitrogen, soluble protein, starch and cane sugar accumulation and proten content, and a positive correlation with fat content; The pod number, seed number and seed weight went higher when the density got smaller, and the yield of 3.6 × lO5-plants-per-hm2 reached to the highest.%以垦农4号大豆为试验材料,在大田条件下,研究了密度对大豆群体碳氮代谢相关指标及产量品质的影响.结果表明,群体单株叶片氮素、可溶性蛋白、淀粉及蔗糖积累量均随着密度的增加而下降,低密度与高密度群体间差距显著;随着种植密度的增加,大豆子粒中蛋白质的含量有所上升,脂肪的含量有所下降;各生育时期氮素、可溶性蛋白、淀粉和蔗糖积累量与子粒蛋白质含量呈负相关,与脂肪含量呈正相关;随着种植密度的增加,群体内单株的荚数、粒数、粒重逐渐减少.在密度36万株/hm时,群体产量最高.
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