不同播种粒数对水稻生育及其产量的影响

选用龙粳9号品种，设计水稻三超栽培352孔大钵盘育苗1、2、3粒三个不同播种密度（粒数）及相应1、2、3个穴内不同苗数的宽行超稀植栽培处理，进行水稻超高产生育特点和产量构成因素的试验研究。结果表明：秧苗素质、成穗率、比叶重、剑叶叶绿素含量、灌浆速度等指标均呈随播种量的增加而减少的趋势，茎鞘叶干物质积累和分蘖态势都表现为1粒播种最佳；产量构成因素中每平方米穗数3粒＞2粒＞1粒，穗粒数1粒＞2粒＞3粒，结实率、千粒重随粒数增加呈下降趋势。表明定位定粒播种减少粒数是培育多蘖壮秧进行宽行超稀植栽培而大幅度提高水稻产量一个有效途径。

Effects of Different Seeding Quantity on Rice Growing and Yield

we designed different treatments of different seeding density(seeding quantity) to study the yield component and the state of growing with the variety Longjing9 under the same fertilizer conditions .In the experiment, we measured the quality of seedlings, dynamic leaf area of post transplanting, and dry matter of plant from sowing seeds to harvest . The Result is as follows: specified leaf weight, dry matter of plant, and dry and fresh weigh of panicle would descend accompanying to the increasing of amount of sowing; the panicle number per m2of yield component: 3seeds>2seeds>1 seed; seed number per panicle: 1 seed>2seeds>3seeds; the percentage of ripe grain and 1000grain weight would decline with the increasing of grain number. In all, reducing the seeding quantities is a valid way to enhance the yield of rice.