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在以固氮为唯一氮源的条件下,加钨处理的盛花期植株干物质重和全氮含量,以及大豆籽粒产量和籽粒粗蛋白含量都显著高于对照(不加钨和钼),而与加钼处理者相当;加钨处理的根瘤乙炔还原活性稍低于加钼处理者,约为后者的90%,但结瘤量却高于加钼处理者。在以硝酸盐为唯一氮源的条件下,加钨处理的盛花期植株干物质重和全氮含量稍高于对照但明显低于加钼处理者;苗期鲜叶硝酸还原酶活性远低于加钼处理者,约为后者的37%。在钼与钨共存时,钨的浓度低于2×10~(-2)mM 时,基本上不影响植株生长和钼的吸收,但钨浓度达2×10~(-1)mM 时,则植株生长和钼的吸收受到明显抑制。钨在相当程度上可代替钼在固氮方面的功能,促进大豆生长,但不能代替钼在同化硝态氮方面的功能。
Under the condition of nitrogen fixation as sole nitrogen source, dry matter weight and total nitrogen content, grain yield and crude protein content of soybean were significantly higher than those of the control (without tungsten and molybdenum) Adding molybdenum treatment was equivalent; adding tungsten treatment of nodular acetylene reduction activity slightly lower than adding molybdenum treatment, about 90% of the latter, but the nodulation was higher than the molybdenum treatment. Under the condition of nitrate as the sole nitrogen source, the dry matter weight and total nitrogen content of the plants treated with tungsten increased slightly but significantly lower than that of the molybdenum-treated condition. The nitrate reductase activity of fresh leaves at the seedling stage was much lower than that of the control Plus molybdenum processor, about 37% of the latter. In the presence of molybdenum and tungsten, the growth of the plants and the absorption of molybdenum did not affect basically when the concentration of tungsten was less than 2 × 10 ~ (-2) mM. However, when the concentration of tungsten was 2 × 10 ~ (-1) mM, Plant growth and molybdenum absorption were significantly inhibited. To a certain extent, tungsten can replace the function of molybdenum in nitrogen fixation and promote the growth of soybean, but it can not replace the function of molybdenum in assimilating nitrate nitrogen.