摘要： 山黄杏叶片内氮、磷、钾年动态变化研究结果表明。花后60d内随果实的增大叶片氮磷钾水平呈下降趋势。氮在花后60~90d随着杏花芽生理分化的进行呈上升趋势。花后90d随着杏花芽形态分化的开始又呈下降趋势；磷在花后60d一直到落叶变化不大。趋于平稳；钾在花后95d以后随着杏花芽形态分化的进程呈上升趋势。通过对山黄杏叶片氮磷钾年动态综合分析得出。在采收后落叶前。施用有机肥或氮磷钾复合肥。花后60d以前应追施一次氮肥。花后65~95d应追施钾肥。通过氮磷钾三元素之间平稳期关系分析。杏是一个喜钾肥树种。

关键词: 山黄杏, 氮, 磷, 钾, 年动态

Abstract: N.P.K.in the leaves of the' Shanhuang' apricot tree tended to decrease within the first 60 days after blossoming.The N level tended to increase with physiological differentiation of flower buds between 60 and 90 days after blossoming,and to decrease with morphological differentiation of flower buds after these days.The P level changed little from the 60th day after blossoming to the time of leave-falling.The K level tended to increase with morphological differentiation of the flower bud 95 days after blossoming.Comprehensive analyses indicated that it was necessary to apply organic manure or N- P- K composite during the period after harvesting and before leave-falling;to apply N fertilizers within the first 60 days right aftet blossoming jand to apply K fertilizers between 65 and 95 days after blossoming.The analyses of N.P.K.relationship demonstrated that apricot was a potassium-loving tree species.

Key words: Shanhuang' apricot, Nitrogen, Phosphorus, Potassium, Annual dynamics