氮肥对大豆不同类型品种结瘤固氮影响的差异性研究

本研究选用生育期和蛋白质含量不同的六个夏大豆品种，在磷钾肥基础上施用三个氮肥水平（０、６、１２ｋｇ氮／亩）。结果表明：施氨抑制结瘤，氮肥越多抑制越严重；抑制作用主要在盛花期前，至鼓粒期有的品种受抑制作用较小；对固氮的抑制在不同品种间存在明显差异，品种豫豆８号表现出较耐氮。酰脲相对丰度与根瘤干重极显著正相关，六叶期、盛花期和鼓粒期两者的相关系数分别为ｒ＿ａ＝０．９５４５、ｒ＿ｂ＝０．８０２５、ｒ＿ｃ＝０．６５３１，Ｐ＜０．０１。酰脲的相对丰度反映了品种的固氮差异和不同氮肥水平下固氮的变化。

STUDY ON THE DIFFERENCES OF NODULATION AND NITROGEN FIXATION OF SOYBEAN VARIETIES UNDER DIFFERENT NITROGEN FERTILIZER LEVELS

Six varieties with different maturity and seed protein content were used in the expectment.The rate of nitrogen applicatian was 0,6,12 kg N per mu.The experimental results indicated:The more then fertilizer was applied to soybean varieties the greater the inhibition of N fertilizeron nodulation and N_2 fixation and the inhibition was more serious in the early period than in thelate period of plant growth.Difference of the inhibihon existed among varieties.Niftogen fixation of variety Yudou 8 was tolerable to N fertilizafion.The positive correlation between drynodule weight and relative ureide abundance was very significant,they were r_a=0.954 5,r_b=0.8025,r_c=0.6531,P 0.01 respectively at V_6 R_2 and R_5 growth periods.The relative ureideabundance reflected the difference and rate of N_2 fixation of soybean varieties under different Nfertilizer levels.