摘要 : The study was conducted to determine induction of bitter pit in apples. Different forms and levels of nitrogen and levels of calcium were applied to watei culture to examine bitter pit incidence and mineral contents of fruits and ... 展开 The study was conducted to determine induction of bitter pit in apples. Different forms and levels of nitrogen and levels of calcium were applied to watei culture to examine bitter pit incidence and mineral contents of fruits and leaves. The NH_4-N group showed significantly higher nitrogen contents in both fruits and leaves than those of the NO_3-N group. However, calcium concentrations were decreased in the group of NH_2-N The NH_2-N group showed the middle range in contents of nitrogen and calcium. Bitter pit incidence in the NH_4-N group was the highest among the treatments Bitter pit incidence tended to be decreased as the nitrogen level reduced As the calcium level increased, calcium contents in fruits and leaves were significantly increased,while those of nitrogen, N/Ca ratio, and bitter pit incidence decreased. Therefore, the results of this study suggested that bitter pit incidence was highly to nitrogen and calcium concentrations of fruits and leaves in apples. 收起