摘要
【目的】探究基施不同分子量改性聚天门冬氨酸(PASP)尿素对水稻产量、氮肥利用率及田面水氮素变化的影响。【方法】以辽宁省水稻高产区辽河三角洲为试验区域,基于减量施氮情况下,将不同分子量改性PASP与尿素进行复配,通过大田试验研究基施不同分子量改性聚天尿素对稻田田面水氮素动态变化、水稻氮吸收利用及生长影响;利用灰色关联度法,综合评价基施不同分子量改性聚天尿素在稻田中的应用效果。【结果】与大颗粒尿素处理相比,不同分子量改性聚天尿素处理降低了田面水氮素浓度,尤其在施基肥后第3天,分子量7500、10000和12500的改性聚天尿素处理田面水NH_(4)^(+)-N浓度较大颗粒尿素处理显著降低了24.54%~56.66%。其中分子量10000的改性聚天尿素处理的田面水NH_(4)^(+)-N浓度较分子量7500、12500和14700的改性聚天尿素处理显著降低了36.84%~45.67%。施用分子量10000的改性聚天尿素能促进水稻生长,提高养分吸收,使水稻产量增加8.22%,籽粒、秸秆氮吸收量显著增加36.47%和62.39%,氮肥表观利用率提高38.31个百分点。【结论】通过对以上各指标进行综合评价,表明基施改性聚天尿素效果优于大颗粒尿素,且尿素添加改性PASP的最佳分子量为10000。推荐辽河三角洲稻区应用分子量10000的改性聚天尿素。
【Objective】In order to evaluate the effects of modified polyaspartic acid(PASP)urea with different molecular weights on rice yield,nitrogen use efficiency and nitrogen(N)concentrations in the surface water of paddy fields.【Method】The Liaohe River delta,a rice-producing area in Liaoning Province,was selected as the experimental area,Modified PASP with different molecular weights was combined with urea.Then the effects of modified PASP urea with different molecular weights on N concentrations in the paddy field ponding water,rice growth,N uptake and utilization were studied under the condition of reduced nitrogen application.And the effects of basal modified PASP urea application with different molecular weights in paddy field were comprehensively evaluated by Grey Relational Analysis.【Result】The results showed that modified PASP urea treatment tests decreased the N concentrations in the surface water compared with the large particle urea treatment test.In particular,NH_(4)^(+)-N concentrations in the surface water in 7500mw,10000mw and 12500mw modified PASP urea treatments test were significantly reduced by 20.23%~56.66%compared with large particle urea treatment test on the third day after basal fertilization.Among them,NH_(4)^(+)-N concentrations in the surface water in 10000 mw modified PASP urea treatment test was significantly lower(36.84%~45.67%)than 7500,12500 and 14700 mw modified PASP urea treatment tests.The application of 10000 mw modified PASP urea could significantly promote rice growth,nutrient absorption,and increase yield,with a 8.22%higher yield,a 36.47%higher N uptake in grain,a 62.39%higher N absorption in straw,a 38.31 percentage point higher of N use-efficiency,compared to the control.【Conclusion】Considering rice yield,nitrogen uptake,nitrogen use efficiency and N concentrations in the surface water,basal application of modified PASP urea treatment based on reduced nitrogen application was better than the treatment using large particle urea.Therefore,urea mixed with 10000 mw mo
作者
赵颖
王娜
牛世伟
张鑫
徐嘉翼
隋世江
任轩
ZHAO Ying;WANG Na;NIU Shiwei;ZHANG Xin;XU Jiayi;SUI Shijiang;REN Xuan(Liaoning Academy of Agricultural Sciences,Shenyang,Liaoning 110161,China;Liaoning Fuyou Grain and Oil Trading Co.,Ltd.,Shenyang,Liaoning 110164,China)
出处
《福建农业学报》
CAS
CSCD
北大核心
2022年第8期977-984,共8页
Fujian Journal of Agricultural Sciences
基金
国家重点研发计划项目(2016YFD0800506)
辽宁省重点研发计划项目(2020JH2/10200017-1)
辽宁省农业科学院基本科研业务费计划项目(2021HQ1908)。
