Effects of Nitrogen-Density Interaction on the Population Quality and Yield Formation of the Rice Cultivar'Xinyounuo 721'
This study aims to reveal the effects of nitrogen-density interaction on the population quality,yield formation,and processing quality of the rice cultivar'Xinyounuo 721'.Four nitrogen application levels were designed,which were A0(CK),A1(180 kg/hm2),A2(240 kg/hm2),and A3(300 kg/hm2).Three transplanting density gradients were designed as B1(215 thousand hills/hm2),B2(257 thousand hills/hm2),and B3(299 thousand hills/hm2).The results showed that the dry matter accumulation of the same nitrogen level increased with the increase in transplanting density.In the case of the same planting density,dry matter accumulation increased with the increase in the nitrogen application level at the jointing stage,and the SPAD value peaked at the early heading stage.There was a positive correlation between the yield and the nitrogen application level.At a certain nitrogen application level,effective panicles increased while the seed setting rate and 1 000-grain weight decreased with the increase in planting density.The maximum husked rice yield,milled rice rate,and head rice rate all appeared in the A2B2 treatment,and the milled rice rate and head rice rate in this treatment were significantly different from those in other treatments.The length-to-width ratio of rice grain was slightly affected by the nitrogen application level and planting density.In conclusion,the treatment with nitrogen application at 240 kg/hm2 and planting density of 257 thousand hills/hm2 had high yield components and rice processing quality.The production should take nitrogen application and planting density into consideration.
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