两种菠菜累积硝酸盐特性差异的研究

水培试验结果表明，日本超能菠菜生长后期的生长量较大，硝酸盐累积量较低，氮素吸收量较少，可以肯定其优良性；在生长后期供给等量硝、铵态氮的条件下，日本超能菠菜吸收硝态氮较少，还原硝酸盐的相对能力又较高，因而累积硝酸盐较宁夏圆叶菠菜低；在仅供给铵态氮源的条件下，日本超能菠菜还原硝酸盐能力较小，可能与其易于吸收和利用铵态氮源有关。

Study on Difference in Nitrate Accumulation Characteristic between Two Spinach Varieties

Solution culture experiments with two varieties of spinach were conducted to study the differences on growth, nitrogen absorption, nitrate accumulation and reduction. The results indicated that, at the later growth period, the weight of Japanese spinach variety was larger than that of Ningxia spinach variety and accumulated nitrate amounts of J. sp. was less than that of N. sp. in the late growth stage. Under the condition of solution culture with two nitrogen resource after solution culture lacking nitrogen, J. sp. was more favorable to NH4 -N and it's nitrogen absorbed was less than N. sp., nitrate relatively reduction ability of J. sp. also was greater than that of N. sp. When the plants were cultured with nutrition solution only containing NH4 -N resource after culture with high concentration of NO3--N, the nitrate reduction ability of N. sp. was larger than that of J. sp. because of more NH4 -N absorbed by J. sp. for metabolism.