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核农学报  2013 

树脂包膜尿素与普通尿素不同配比在春玉米上的应用研究

DOI: 10.11869/hnxb.2013.09.1385, PP. 1385-1390

Keywords: 春玉米,树脂包膜尿素,产量,净收入,氮素利用率

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Abstract:

通过大田试验系统研究了释放期为60d的树脂包膜尿素(CU60)与普通尿素(U)不同配比基施对春玉米花前花后地上部干物质和吸氮量、地上部总吸氮量、氮肥利用效率、产量、净收益的影响,并对CU60氮素田间溶出特征进行分析。结果表明:在等氮量情况下,CU60与U的不同配比基施与习惯施肥比增加了花后干物质比例和花后吸氮量比例。在等氮量情况下,地上部总吸氮量、子粒吸氮量明显增加,氮肥利用率(REN)提高2~12个百分点,氮肥农学效率(AEN)提高2~5个百分点,氮肥偏生产力(PFPN)提高2~6个百分点,其中CU60与U的配比为3:7时上述各指标优于其他各处理。CU60与U的配比在2.5:7.5~4:6范围内基施与习惯施肥相比春玉米产量显著提高,增7.3%~10.7%,净收入增加1425~2166元·hm-2,其中CU60与U的配比为3:7时千粒重增加,产量最高。CU60氮素在田间溶出时间大大延长,与U配比基施符合春玉米的吸氮动态。综上所述,在东北风沙土地区种植春玉米应用60d的树脂包膜尿素配施普通尿素最适宜比例为3:7。

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