【摘要】 <正> 我国陕西、甘肃等省高海拔苹果产区,“元帅”系苹果时常出现水心病,一般年份病果率为20—30%,严重的可达94%。由于水心病果不耐储藏,还会导致内部腐烂,因此,在这些地区,防止水心病发生是苹果生产中的一个重要问题。 现代科学资料认为,苹果发生水心病与果实缺钙有关。我们在陕西省凤县秦更多还原

【Abstract】 Peel and flesh samples of healthy, medium and severe watereored fruits of Delicious apples grown on calcareous soils were collected from two orchards located in high altitude regions of Tian Shui in Gansu province at harvest in 1978. The analytical data of the inorganic constituents and nitrogen contents of the samples showed that even though the orchard soils were high in free calcium carbonate, the occurrence of watercore were also inversely related to calcium levels in peel and flesh of fruits. Increase the ratios of fruit K/Ca, K+Mg/Ca, K/Mg+Ca and decrease the percentage of fruit P, Zn and Mn might induce occurrence of watercore, No positive relationship was found between fruit nitrogen contents and N/Ca ratios with incidence of watercore.更多还原