铁和不同形态氮素对玉米植株吸收矿质元素及其在体内分布的影响——Ⅰ.对氮、磷、钾、钙、镁等营养元素的影响

用营养液培养方法研究了铁和两种形态氮素(NO₃^--N和NH₄⁺-N)对玉米植株吸收氮、磷、钾等大量元素和钙、镁等中量元素及其在体内分布的影响。结果表明:与NO₃^--N相比,供应NH₄⁺-N促进了玉米对氮的吸收,在缺铁条件下,降低了对磷、钾、钙及镁的吸收。铁和NH₄⁺-N都显著提高了玉米植株各器官中氮的含量。与NH₄⁺-N处理相比,NO₃^--N处理的新叶中磷含量显著增加,但铁的供应对植物体内磷的含量无显著影响。使用NO₃^--N显著提高了玉米新叶和老叶中钾的含量,根和茎中钾的含量无明显影响。铁的供应降低了新叶和老叶中钾的含量。供铁时,NH₄⁺-N处理的玉米新叶中钙和镁的含量显著低于NO₃^--N处理,而在缺铁时则无显著差异。

EFFECTS OF Fe AND DIFFERENT FORMS OF NITROGEN ON UPTAKE AND DISTRIBUTION OF MINERAL ELEMENTS IN CORN PLANTS I. On the N, P, K, Ca, and Mg

The effects of Fe and different forms of nitrogen on uptake, translocation and efficiency of N, P, K, Ca, Mg in corn plants were studied in solution culture under the controlled conditions. The results showed that the different forms of nitrogen could influence contents of N, P, K, Ca, Mg obvirously under the Fe-deficient condition. Comparing to supply with NO₃^--N using NH₄⁺-N caused a sigificant decline of Ca and Mg contents In young leaves, but under the Fe sufficient condition, this difference was not. found. K content in young leaves declined by using NH₄⁺-N content in young leaves also decreased under the Fe-deficient condition. Under the Fe-deficient condition, NO₃^--N induced the young leaves to turn to chlorosis, and the P content in them was also higher than that when using NH₄⁺-N. The contents of N, P, K, Ca, and Mg in old leaves, stem and roots were also discussed.