播种量对直播早稻群体质量和产量的影响

Effect of Seeding Amount on the Population Quality and Grain Yield of Direct-seeded Rice

以两系杂交早稻陵两优819为材料,研究不同播种量对直播稻群体质量和产量的影响。结果表明,播种量对直播稻产量和群体质量有明显影响。稻谷产量以播种量37.5 kg/hm2最高;干物质产量以播种量60 kg/hm2最高;单位面积穗数以播种量45 kg/hm2最高;收获指数和成穗率与播种量极显著负相关;播种量对叶片叶绿素的影响在抽穗之前最明显,抽穗前叶片SPAD值与播种量极显著负相关;粒叶比随着播种量的提高递减,粒叶比与播种量显著负相关;高播种量增加抽穗前N素积累,影响后期N素吸收;T1干物质产量极显著低于T5、稻谷产量极显著高于T5与其群体质量优有关。直播稻适宜播种量为35~45 kg/hm2。

Lingliangyou819 was studied for the effect of different seeding amount on the population quality and yield as early season rice of direct-seeded rice.The result showed that the seeding amount of direct-seeded rice had significant effects on the grain yield and population quality.The seeding amount of 37.5 kg/hm2 had the highest grain yield.The seeding amount of 60 kg/hm2 had the highest dry matter yield.The seeding amount of 45 kg/hm2 had the highest panicle number of a unit area.The harvest index and rate of effective panicles were negatively correlated with seeding amount.Seeding amount had significant effects on the chlorophyll of leaves before heading.The SPAD value of leaves before heading was negatively correlated with seeding amount.The ratio of grains and leaf area decreased with seeding amount.The ratio of grains and leave area and seeding amount were negatively correlated.Hight seeding amount increased nitrogen accumulated before heading,and influenced nitrogen absorption after heading.The dry matter yield of T1 was lower than that of T5,the grain yield of T1 was higher than that of T5,Which was related to population quality.Seeding amount of 35-45 kg/hm2 was suitable to direct-seeded rice.