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比较桂热杧82号叶片氮、磷、钾、钙、镁、硫等6种矿质营养元素在不同月份的变异系数、离年均差及两蓬叶片矿质元素不同年份差异。结果表明,花芽分化前期或5月叶龄(12月)叶片氮、磷、钾、钙、镁、硫等6种矿质元素变异小和离年均差小,两蓬叶片矿质元素含量稳定且能代表全年树体营养状况;第一蓬叶片不同年份间差异小,故桂热杧82号叶片营养诊断在12月采集第一蓬叶片较为适宜。
The variation coefficient, annual mean difference of six mineral nutrients such as nitrogen, phosphorus, potassium, calcium, magnesium and sulfur in leaves of Guizhi 杧 82 in different months and the difference of mineral elements in two leaves were compared. The results showed that the six mineral elements such as nitrogen, phosphorus, potassium, calcium, magnesium and sulfur in the early stage of flower bud differentiation or in May leaf age (December) were small in variation and small in annual leaf age. The contents of mineral elements Representing the annual tree body nutritional status; the first Pui leaves in different years the difference is small, so Guizhi Pui 82 leaves nutrition diagnosis in December to collect the first Pui leaves more appropriate.