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国光苹果在碱性土壤中易发生缺钙,引起果实苦痘病的发生。本文通过两年的研究证实,果实苦痘病的发生是由于果实内钙素含量低,氮素含量高,氮、钙比值过大的原因。果实中钙素的积累主要是在盛花后的8周前,而果实发育中后期,钙素积累缓慢。树体喷洒钙盐以硝酸钙,氯化钙混同硼砂效果较好。预防苦痘病的发生,还应注意限制土壤氮肥的施用量。
Guoguang apple in alkaline soil prone to calcium deficiency, causing fruit bitter pox disease. This article through two years of research confirmed that the occurrence of fruit bitter pox disease is due to low fruit calcium content, high nitrogen content, nitrogen, calcium ratio is too large reason. The accumulation of calcium in the fruit is mainly 8 weeks after the full bloom, while the accumulation of calcium is slow in the middle and late stages of fruit development. Tree sprayed calcium to calcium nitrate, calcium chloride mixed with borax better. Prevention of bitter pit disease, should also pay attention to limit the amount of soil nitrogen fertilizer.