不同调节措施对菜豆吸收矿质养分及其在体内分布的影响──Ⅰ.N,P,K,Ca,Mg

Effects of Fe, Nitrogen Forms and Shading on Uptake and Distribution of Other Nutrient Element in Bean Plants──Ⅰ.N, P, K, Ca, Mg

用营养液培养方法研究了在缺铁条件下，两种形态氮素（NO－N和NH-N）及老叶遮光对菜豆植株生长、氮、磷、钾、钙、镁的吸收及其在体内分布的影响。在缺铁条件下，NON营养的菜豆新叶出现明显的黄化，遮光可减轻黄化症状，NON的供应甚至可基本上使新叶保持绿色，但对干物质的积累没有明显的影响。NON的供应使钾和钙的吸收明显降低，新叶中的含量也显著低于NON处理。黄化叶中磷的含量较低。新叶中氮和镁的含量在各个处理间差异不大。

The effects of Fe, N forms and shading on growth of bean plants and uptake, distribution of N,P,K,Ca,Mg in bean plants were studied in a solution culture under the controlled conditions. The results showed that the different N forms could innuence the contents of N,P,K,ca,Mg and had no effect on the plant uptake of these elements. In comparison to supply with NO3-N, NH -N appliation caused a significant decline of the Ca, K contents in young leaves, but there were no difference for N and Mg con tents between NO3-N and NH -N tratments. Under the Fe-deficient condition, NO3--N form of nitrogen induced the young leaves to become chloiosis, and the P content in there young leaves was also lower than the young leaves in the treatinents shading of first leaves and the supply with NH -N. The contents of N,P,K,Ca and Mg in first leaves stem and root were also measured.