In this paper,the effects of different plant and row spacing and seedling number per hole of japonica rice on yield were studied with the medium-maturing medium japonica rice Zhengdao No. 19 as experimental material. The results showed that the effects of different plant and row spacing and seedling number per hole on yield and its components of Zhengdao No. 19 were all significant. The correlation analysis showed that there were significant correlations between plant spacing,seeding number per hoel and yield;the ear number,total spikelet number,seed setting rate were significantly positively correlated with yield;the total spikelet number was significantly positively correlated with ear number,seed setting rate;grain number per ear was significantly positively correlated with thousand-grain weight; the ear number was significantly negatively correlated with grain number per ear,thousand-grain weight;the total spikelet number was significantly negatively correlated with thousand-grain weight. The path analysis showed that the order of contribution to yield of Zhengdao No. 1 was total spikelet number>seed setting rate>thousand-grain weight,and the order of contribution to total spikelet number was ear number>grain number per ear. The yield of treatment with wide and narrow row spacing was significantly higher than that of treatment with equidistant row,and the yield of treatment with three seedlings per hole was significantly higher than the other treatments. The treatment A2B3C3 had the highest yield of 8 899. 51 kg/ha,which increased by 4. 53%—34. 80% compared with the other treatments. The treatment A2B4C3 had the second yield of 8 513. 60 kg/ha, which increased by 5. 47%—28. 96% compared with the other treatments.%以中熟中粳郑稻19号为试验材料,研究不同株行距和栽插本数对其产量及其构成因素的影响。结果表明,行、株距和栽插本数对郑稻19号的产量及其构成因素均有显著的影响。相关分析表明,株距和栽插本数、穗数、总颖花量和结实率均与产量呈极显著正相关；总颖花量与穗数、结实率,穗粒数与千粒质量间呈显著、极显著正相关；穗数与穗粒数、千粒质量,总颖花量和千粒质量间呈极显著负相关。通径分析表明,对郑稻19号产量的净贡献率大小依次为总颖花量>结实率>千粒质量,对总颖花量的净贡献率大小依次为穗数>穗粒数。宽窄行的产量显著高于等行距,3本栽插时产量显著高于其他处理；且处理A2B3C3组合产量最高为8899.51 kg/hm2,较其他处理增产4.53%~34.80%；其次是 A2B4C3组合,产量为8513.60 kg/hm2,较其他组合增产5.47%~28.96%。
展开▼
