Effects of Different Fertilization Treatments on Economic Characters of Rice and Nitrate Nitrogen Content in Soil

In order to provide technical support and theoretical basis for rational fertilization of rice in the Yellow River irrigation district of Ningxia,effects of different fertilization treatments on economic characters of rice and nitrate nitrogen content in soil was studied by randomized block design using Fuyuan4.Results:Grain yield of various fertilizer treatments was 22.2% ~75.1% higher than that of CK treatment,biomass yield of various fertilizer treatments was 24.5% ~128.5% higher than that of CK treatment,the highest grain yield and biomass yield was 1.5NPKM treatment while that were 10.9kg/hm2 and 13.5kg/hm2 respectively.The second was NPKM treatment that was respectively 10.7kg/hm2 and 11.9kg/hm2,but the difference was not significant(p5%).The highest thousand seed weight was CK treatment that was 24.9g.The highest productive ear kernels per spike and number of productive ear was 1.5NPKM treatment that was 106 grain and 5,265,000 spike per hectare,while the lowest setting percentage was 1.5NPKM treatment that was 68.9%.The highest nitrate nitrogen content of 0~100cm soil layer was 1.5NPKM treatment that was 7.19mg/kg,while the lowest was PK treatment that was1.56mg/kg.In conclusion,It is more reasonable referring to NPKM treatment for rice fertilization in the Yellow River irrigation district of Ningxia.