甜椒对不同形态氮素的吸收和分配

甜椒对不同形态氮素的吸收利用有显著差异。幼苗期及发棵期ＮＨ ＋４ Ｎ 对生长有利，而盛果期则以ＮＯ－３ Ｎ 有利。同种形态氮素因施用时期不同而氮素利用率差异很大，以盛果期追肥利用率最高，为４１８ ％ ～４５８ ％ ； 基肥利用率为３３６ ％ ～３６７ ％ 。不同时期施肥的肥料氮在各器官的分配不同，基肥及初花期施肥氮素主要流向茎叶，占总吸收量的７５ ％ 左右；盛果期追肥以果实分配较多，占总吸收量的６０ ％以上。对植株氮素来源的分析表明，仅４００ ％ ～４１５ ％ 的氮素来自于肥料，而近６０ ％ 的氮素来自于土壤。

ABSORPTION AND DISTRIBUTION OF DIFFERENT FORM OF NITROGEN IN SWEET PEPPER

The absorption and utilization of different form of nitrogen in sweet pepper were studied.The result showed that NH\++\-4\|N was favourable to growth of sweet pepper at seedling period and plant developing period and NO\+-\-3\|N was favourable at fruiting period.The utilization of the same form of nitrogen was quite different when N applied in different period.The utilization rate of nitrogen fertilizer dressed at fruiting was the highest (41\^8%～45\^8%), while that of the basal manure was the lowest(33 6%～36\^7%).75% of the nitrogen uptaken from basal manure and fertilizer dressed in plant developing period was distributed in stems and leaves, more than 60% of nitrogen dressed in fruiting period was distributed in fruit.The analysis of fertilizer\|N and soil\|N in sweet pepper plant indicated that about 60% of plant\|N was derived from soil\|N and about 40% of plant\|N was derived from fertilizer\|N.