山黄杏叶片氮磷钾年动态变化

Annual Dynamics of Nitrogen,Phosphorus and Potassium in Leaves of 'Shanhuang' Apricot Tree

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.

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.