氮肥和密度对精量穴直播的影响试验（一）——水稻产量形成特性

采用大田随机区组设计，研究了不同的施氮水平和不同的栽培密度水平对精量穴直播晚稻培杂泰丰产量形成特性的影响。结果表明：氮肥和密度对产量，生物产量，叶面积指数，结实率和每穗粒数影响显著。增加施氮量能够显著提高个体和群体生物产量，提高叶面积指数。N2D2处理实际产量和理论产量都最高，分别达到6.945 t?hm-2和8.166 t?hm-2，适合在生产上大面积推广。

Effects of Nitrogen Fertilizer and Density on Precision Hill-direct-seeding Rice

By using the latest developed precision hill-direct-seeding machine, precision hill-direct-seeding rice was a Advanced, high yield, high efficiency, Light and simply cultivation method. The production and extension area increased by year in china, and needed matching technology of the optimum cultivation model urgently. By methods of field trials and randomized blocks design, the effects of nitrogen fertilizer and density on yield formation characteristics of precision hill-direct-seeding rice was studied in this experiment. The result indicated that different treatments of nitrogen fertilizer and density increased the yield, biological yield, leaf area index, seed setting rate and grain number per panicle significantly. In 12.5 kg/667m^2（N2） application of nitrogen fertilizer, the actual yield, grain number per panicle, seed setting rate and biological yield of mature stage was the most. In the density of 14 cm×25 cm （D2）, the actual yield, effective panicle number and theoretical yield was the most. Biological yield and leaf area index of four stages was higher than others significantly. The actual yield and theoretical yield of N2D2 treatment was the most, reached 6.945 t/hm^2 and 8.166 t/hm^2 respectively, and its effective panicle number and biological yield of mature stage was higher than other treatment significantly.