【摘要】 以20年树龄库尔勒香梨果树为试材,研究了叶片中6种矿质营养元素(N、P、K、Ca、Fe、Zn)含量的7个生长时期的动态变化及相关性。结果表明:叶片内N、P、K含量随叶龄增加而降低;Ca、Fe、Zn含量随叶龄增加出现先升高后期明显降低的变化,只是高峰出现的时期各异;N与P、K及P与K元素分别呈极显著正相关和显著正相关;Ca与Zn元素呈极显著正相关。更多还原

【Abstract】 The annual development and the relativity of six mineral nutritious elements (N, P, K, Ca, Fe and Zn) of "Kuerle"pear leaves were studied during seven growth periods. The result showed that the contents of N、P and Kin the leavesmanifested a decreasing tendency in a year .The contents of Ca、Fe、Zn were increasing in early period , obviously decrea-sing in later period, the times of reaching climax were different. Elements N、P and K showed extremely remarkable positiverelativity, P and K showed remarkable positive relativity, Ca and Zn a showed extremely remarkable positive relativity.更多还原