关键词: 直播稻, 施肥方式, 密度, 产量, 群体, 干物质生产

Abstract: A split plot design with two factors was used to study the effects of different densities and fertilization method on Yield and its components and photosynthetic matter accumulation, using conventional japonica rice variety Yungeng 41 as material. The results showed that:（1） Under the different fertilization methods, in the same density, the yields were increased with the increasing of nitrogen fertilizer, the yields of split fertilization were significantly higher than that of controlled release fertilization and the control; at the same N level, the yields were decreased with the increasing of density. （2）Under the controlled release fertilization, in the same density, the effective panicles and grains per panicle were increased with the increasing of nitrogen fertilizer significantly; at the same N level, the effective panicles were increased with the increasing of density, but the grains per panicle were opposite. There are significantly positive relationship between spikelet number per unit area and the yield. Increasing the spikelets per panicle based on suitable panicle number, thus could increase the spikelet number per unit area, which is the main way to improve rice yield.（3） In the same density, the total dry matter accumulation from heading to maturity, the population growth rate, leaf areas and total spikelets were increased with the amount of nitrogen. In this paper, the population structure of A1RPQ4 treatment was better than the other treatments, it had stable dynamics of tillers, higher total dry matter accumulation from heading to maturity, higher spikelet/leaf ratio, grain weight/leaf ratio, and the yield reached 875.14 kg/667 m2.

Key words: direct seeding rice, fertilization method, density, yield, population, dry matter production