缓释肥与不同比例速效氮肥混施对盐粳218生长发育及氮肥利用率的影响

以盐粳218为供试材料,设置5个不同比例的速效氮肥施入处理,探讨缓释肥与不同比例速效氮肥混施对盐粳218生长发育及氮肥利用率的影响。结果表明:在施氮总量相同情况下(施氮量:270 kg/hm^2,缓释肥均于基肥和一次蘖肥分别施入450 kg/hm^2和150 kg/hm2),不同处理间存在差异,A4处理(基肥、一次蘖肥、二次蘖肥、促花肥、保花肥比例为47∶25∶15∶13∶0、一、二次蘖肥于5.5、6.5叶龄期追施速效氮肥)较其它处理(A1、A2、A3、A5)单产分别提高16.5%、10.9%、2.8%、2.0%,氮肥利用率分别提高3.9、2.1、1.7、3.7个百分点,获得最高单产10.93 t/hm^2,其氮肥利用率最高,为46.03%。

The Effect of Mixed Applying for Slow Release Fertilizer and Available Nitrogen on Growth and Nitrogen Utilization Efficiency of Yangeng-218

The effect of mixed applying for slow release fertilizer and available nitrogen on growth and nitrogen utilization efficiency of Yangeng-218 were researched by using 5 treatments of different proportions of available nitrogen.The result indicated that there were significant differences among different treatments under the same amount of nitrogen applied(applying nitrogenous fertilizer quantity:270 kg/hm^2,using 450 kg/hm^2 slow release fertilizer as base fertilizer and using 150 kg/hm^2 slow release fertilizer as primary tillering fertilizer),the yield of treatment-A4(the fertilizer ratio of base fertilizer,primary tillering fertilizer,secondary tillering fertilizer,flower accelerating fertilizer and conserving fertilizer was 47:25:15:13:0,the available nitrogen topdressing as primary tillering fertilizer and secondary tillering fertilizer were used at 5.5 and 6.5 leaf stage)increased 6.5%,10.9%,2.8%,2.0%than treatment-A1,treatment-A2,treatment-A3 and treatment-A5,the nitrogen utilization efficiency was 46.03%which increased 3.9%,2.1%,1.7%and 3.7%,the yield was 10.93 t/hm^2.