【摘要】 以晚三吉梨为试材的研究结果表明：５月上旬叶片氮磷钾含量最高，７月上旬次之，果实成熟期最低；负载量相同时，果实成熟期的叶片氮、磷含量年份间差异不显著，钾含量差异显著；５月上旬的叶片含氮量、７月上旬和果实成熟期的叶片含钾量与平均单果重呈显著或极显著正相关。更多还原

【Abstract】 The Okusankichi pear cultivar in sand pear (Pyrus pyrifolia) were studied. The results showed that:the contents of N, P and K in leaves at early May were the highest, then that at early July, that at the harvest time were the lowest. In different years, N、P contents in leaves at harvest time had no significant difference, but K contents had significant difference. N contents at early May, K contents at early July and at harvest time had significant or highly significant positive correlation with single fruit weight.更多还原