氮肥和密度对两系亚种间杂交稻“两优培九”增量及产量结构的影响

以两优培九为试验材料，分析了不同氮肥用量(纯N0kg／hm

Effects of TransplantingDensity and Nitrogen Fertilizer on Yield and Yield Components for Two-lineIntersubspecific Hybrid

The effects of different levels of nitrogen fertilizer（0kg／hm2，112.5 kg／hm2，225.0 kg／hm2 and 337.5 kg／hm2) and transplanting density（22.5×104 hole／hm2，27.0×104 hole／hm2，31.5×104 hole／hm2）on the yield and its components for intersubspecific hybrid rice Liangyoupeijiu were studied based on field experiments in 1998．Influnence of transplanting density on panicle number per unit area and grain number per panicle was higher than that on seed-setting rate and 1 000-grain weight．The differences among yields in the treatments with transplanting density ranging from 22.5×104～31.5×104 holes per hectare were not significant．Effect of nitrogen fertilizer on grain number per panicle was lower than that on panicle number seed-setting rate and 1 000-grain weight．Seeding-setting rate and 1 000-grain weight were decreased significantly in the treatment with 337.5 kg／hm2 nitrogen fertilizer．Panicle number，grain number per panicle，seed-setting rate and 1 000-grain weight of Liangyoupeijiu will be well coordinated to get high yield when it being transplanted at the density less than 27×104 holes per hectare and being applied with 225.0 kg／hm2 nitrogen in the medium-fertility field（in high-yielding field，density should be about 22.5×104 holes per hectare）．