Influence of Transplanting Density and Applied N Fertilizer on the Yield of Intersubspecific Hybrid Rice 65396 and Its Components

The effects of different level of nitrogen fertilizer (0 kg/hm2, 120 kg/hm2, 240 kg/hm2 and 360 kg/hm2) and transplanting density (21 × 104hole/hm2, 27 × 104 hole/hm2, 33 x 104hole/hm2) on the yield and its components for intersubspecific hybrid rice 65396 were studied based on field experiments in 1999. Influence of transplanting density on panicle 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 transpanting density ranging from (21 -33) × 104 hole per hectare were not significant. Effect of nitrogen fertilizer on seed-setting rate was lower than that on panicle per unit area, grain number per panicle and 1 000-grain weight. Grain number per panicle and 1 000-grain weight were decreased significantly in the treatment with 360 kg/hm2 nitrogen fertilizer. Panicle number, grain number per panicle, seed-setting rate and 1 000-grain weight of the 65396 will be well coordinated to get high yield when it is being transplanted at the density about 27 × 104 holes per hectare and being applied with 240 kg/ hm2 nitrogen in the medium-fertility field.