滴灌条件下红枣生育期需肥特征研究

Study on Pattern of Requirement of Fertilizer in Zizyphus jujube Growth Period under Drip Irrigation Condition

滴灌条件下对红枣进行生育期需肥规律研究,通过对氮、磷、钾三要素在红枣各器官中的分配和浓度变化以及在各生育阶段的动态变化进行初步分析。结果表明,枣树年生长周期中氮、磷、钾的吸收均在果实膨大期达到最大,随后氮的吸收开始逐渐降低,对氮、磷、钾的吸收总量为N>K>P。枣树对氮的吸收和枣叶萌发同时进行,并不断增加;对磷素的吸收变化比较平缓;钾肥的吸收在萌芽开花期需要量相对较少,座果后吸收量增加,并随果实的膨大吸收量明显增加。

The pattern of requirement of fertilizer in Ziryphusjujube Growth period under Drip Irrigation Condition, and the distribution and concentration variation of N, P, K of every growth period in different organ were studied by random sampling and laboratory analysis. The resuits showed that the absorption content of N, P, K reached the most capacity in fruit expanding period, after that the absorption content of N began decreasing, the total absorption content of N, P, K was N 〉 K 〉 P in Zizyphus jujube growth period. The absorption of N and growth of leaves began at the same time, after then it begans increasing. The absorption of P was low and stabe. The absorption content of K was relatively low in leaves growth and flower period, after fruiting it begins increasing, and with the fruit expanding it increased rapidly.