Field experiment was conducted to study the effect of foliar spray of organic calcium (calcium citrate, 0.2%) and inorganic calcium (calcium nitrate, 0.2%) on calcium nutrition, fruit development and fruit quality of gold silk thread jujube. The 20 year-old Laoling gold silk jujube trees were used as test materials. During the growing seasons, the fruit growth index and the calcium content in leaves and fruits were measured for four times, and at the harvest days selected fruit quality index was measured. The preliminary results showed that foliar spraying organic and inorganic calcium signifi-cantly increased calcium content in the gold silk thread jujube fruits and leaves, increased the soluble sugar content in fruits, and increased the single fruit weight and fruit shape index. Spraying calcium fertilizer also significantly increased the leaf SPAD values due to the improving of the leaf nitrogen nutrition. Spraying calcium citrate significantly increased the pro-portion of high quality fruit and reduced the proportion of low quality fruit. Thus both calcium fertilizers can be used in future to improve the nutritional status of gold silk thread jujube and enhance fruit development although the foliar spraying of calci-um citrate is better than calcium nitrate.%为探究叶面喷施钙肥对金丝小枣钙素营养、果实发育及品质的影响,以20年生乐陵金丝小枣为试材,以喷清水为对照,进行叶面喷施有机钙 (柠檬酸钙,0.2%) 和无机钙 (硝酸钙,0.2%) 试验,生长期间分4次测量果实生长指标以及叶片、果实中钙含量,收获期对一些果实品质指标进行测定.研究结果表明:叶面喷施有机钙和无机钙均可提高金丝小枣果实和叶片的 Ca含量、果实可溶性糖含量、单果重、果形指数.喷施两种钙肥还可显著提高叶片SPAD值,改善叶片氮素营养.喷施柠檬酸钙可显著提高果实优质果比例,并降低劣质果比例.两种钙肥均可改善金丝小枣营养状况,促进金丝小枣果实发育,并且柠檬酸钙的效果优于硝酸钙.
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