Effects of Inorganic Nitrogen Ratio of Base Fertilizer to Topdressing on Yield and Quality of Rice Variety Xindao 18

In order to confirm the proper ratio of base fertilizer to topdressing for new rice variety Xindao 18 cultivation,the inorganic fertilizer experiment was conducted for 3 years with 6 treatments of different ratios.The result showed that,when the ratio of base fertilizer to topdressing was 4 ∶ 6 and 3 ∶ 7,the spike number,grain number per spike and 1000-grain weight reached to 3.45×106/ha and 3.48×106/ha,158.7,158.6,27.9 27.2 g,respectively,the yield advantage being obvious compared to other four treatments.Besides,Xindao 18 had good milling and appearance quality when the N ratio of base fertilizer to topdressing was 3 ∶ 7,and also presented the high head rice rate,low chalkiness degree and amylose content,and thick gel consistency.It was concluded that the appropriate N ratio of base fertilizer to topdressing for Xindao18 was 3 ∶ 7,giving a theoretical yield of 9 584.7 kg/ha and high comprehensive quality.