摘要
依据2008年5-10月在宁夏灵武灌区的田间试验资料,探讨最优氮磷组合对水稻产量及氮肥利用率的影响。结果表明:12个氮磷组合处理的产量为7361~10680kg/hm2,比对照增产28%~85%,差异极显著(F=28.013,P=0.0001)。氮磷交互作用显示,低氮水平适量增施磷肥增产,低磷水平适量增施氮肥增产,即处理6(N15P6)、4(N15P9)、5(N15P3)、3(N10P9)增产明显,其中处理6(N15P6)投入氮肥225kg/hm2、磷肥90kg/hm2,产量构成因子为524穗/m2,93粒/穗,结实率93%,千粒重23.5g,各因子增长较均衡,产量最高,为10680kg/hm2,氮肥利用率45.5%,比当地常规施肥(氮肥300kg/hm2、磷肥45kg/hm2)增产17.4%,节约氮肥25%,增施磷肥50%,氮肥利用率提升20.7%,可消减和降低氮素对土壤和水体的污染,该组合值得在当地推广应用。
Based on field experimental data for irrigation rice in Lingwu,the effects of different N/P fertilizer application on rice yield and N use efficiency were studied.The results showed that the yields of 12 N/P treatments were 7.361t/ha^10.680t/ha,28%~85% higher than CK.The yield increased if adding appropriate fertilizer N based on low level of P,as same as adding appropriate fertilizer P based on low level of N.So treatments 6（N15P6）,4（N15P9）,5（N15P3）,3（N10P9） got the best yield-composition,of which treatment 6 got best yield as 10.679t/ha.The treatment saved N by 25%,increased yield by 17.4% and efficiency of N by 20.7%.In conclusion,coupling of N15P6 was a best solution to apply and extend in irrigation area of Ningxia.
出处
《中国农业气象》
CSCD
2010年第3期379-383,共5页
Chinese Journal of Agrometeorology
基金
国家科技支撑计划(2006BAD04B00)
国家水体污染控制与治理科技重大专项(2008ZX07425-001)
中央级公益性科研院所基本科研业务费项目(院所长基金)
关键词
水稻
产量构成
氮磷组合
总氮吸收
氮肥利用率
Rice
Yield components
N and P coupling
Total N uptake
N use efficiency
