不同施氮水平对嫁接黄瓜不同部位硝酸盐含量的影响

Effects of Different Nitrogen Levels on Nitrate Content in Different Parts of Grafted Cucumber

以新泰密刺/黑籽南瓜嫁接苗为材料,采用日光温室土培的方法研究了不同施氮水平对嫁接黄瓜不同部位硝酸盐含量的影响。结果表明,随氮肥施用量增加,叶片和叶柄硝酸盐含量增加,果实先升高后略有降低;叶柄硝酸盐含量高于叶片和果实;叶片和叶柄硝酸盐含量盛果期最高,末果期最低,果实则初果期最高;随叶位降低,叶柄硝酸盐含量先降低后升高,叶片硝酸还原酶活性呈相反趋势。

The trials were conducted in solar greenhouse to study the effects of different nitrogen levels on nitrate content in different parts of grafted cucumber （Cucumis sativus L. Xintairnici/Cucurbita Ficifolia）. The results showed that the nitrate content in laminae and leafstalk increased following the increase of nitrogen, while that in fruit first increased and later decreased. The nitrate contents in leafstalk were higher than that in laminae and fruit. In laminae and leafstalk, nitrate contents of metaphase of fruiting were highest, while in fruit that of early-days of fruiting was highest. The nitrate contents in leafstalk were decreased at first and later increased following the lower of positions, re verse the direction of the nitrate reductase activity.