肥料袋控缓释对沾化冬枣氮素利用率与生长结果的影响

  袋控缓释肥根据果树个体较大的特点, 改变一般控释肥颗粒包膜的设计思路, 利用控释袋包装达到控制肥料释放的目的。以沾化冬枣为试材对袋控缓释肥进行大田试验, 结果表明: 肥料袋控缓释处理生长季土壤有效养分浓度稳定, 而肥料散施处理土壤养分浓度波动大; 施用10袋/株(16.5 g/m² ) 纯氮时, 袋控缓释处理氮素利用率约为一次性散施处理的2.8倍, 约为分次散施处理的115倍; 养分稳定供应,冬枣植株生长健壮, 能有效克服肥料散施导致短期内土壤有效氮水平过高, 刺激枣头大量萌发造成营养竞争的问题; 同一施肥水平, 袋控缓释处理植株的叶片叶绿素含量与Pn值高且稳定, 产量与果实品质显著提高。

Effect of Fertilizer Being Bag-controlled Release on Nitrogen Utilization Rate, Growth and Fruiting of Zhanhua Winter Date (Zizyphus jujuba Mill. var. inermis Rehd. )

Bag controlled release fertilizer was a new type fertilizer which changed the idea of spraying high molecular materials to fertilizer particles according to the big individual volume characteristics of fruit trees. Experiments about effect of fertilizer being bag-controlled release on nitrogen utilization rate, growth and fruiting were done using Zhanhua Winter Date(Zizyphus jujuba Mill.var.inermis Rehd.)as materials,the results showed that:Soil available nutrients concentration of fertilizer being bag controlled release application treatments(BCRT) was more steadier than that of fertilizer being spread application treatments(ST);N utilization rate for BCRT trees was 2.8 and 1.5 times as high as that for fertilizer being spread application in one time treatments and in four times treatments trees respectively; Trees of BCRT were healthier but generated less jujube shoot than trees of ST due to steady nutrients concentration in soil; At the same application amount level chlorophyll content and Pn of BCRT trees were steadier and higher than those of ST; BCRT significantly increased yield and fruit quality.