Abstract:

To investigate the effects of sowing density on lodging resistance, yield, yield formation and quality of rice under mechanical strip sowing mode, the experiment were conducted using conventional japonica rice varieties Nangeng 9108 and Nangeng 5718 as materials, with five sowing densities set for each variety, namely 90.0, 112.5, 135.0, 157.5, and 180.0 kg/hm². The results showed that with the increase of sowing density, the number of tillers and effective ears increased, while the plant height, ear length, and bending resistance decreased, the yield first increased and then decreased. With the increase of sowing density, the brown rice rate, polished rice rate, and whole polished rice rate first increased and then decreased, while the protein content first decreased and then increased. Nangeng 9108 and Nangeng 5718 achieved their highest yields at sowing densities of 112.5 kg/hm² and 135.0 kg/hm², respectively. The yield and appearance quality of Nangeng 5718 were better than those of Nangeng 9108, but the processing quality and taste were not as good as those of Nangeng 9108.

Key words: rice, mechanical drill seeding, sowing density, yield, lodging resistance, rice quality

摘要：

为探明机械条播模式下播种密度对水稻抗倒性、产量及品质的影响，本研究以常规粳稻南粳9108和南粳5718为试验材料，每个品种设置5个播种密度，即90.0、112.5、135.0、157.5和180.0 kg/hm²，考察不同播种密度对水稻抗倒能力、稻米品质及产量形成等的影响。结果表明，随着播种密度的增加，茎蘖数和有效穗数增加，株高、穗长和抗折力降低，产量先增后降；随着播种密度的增加，糙米率、精米率和整精米率先增加后降低，蛋白质含量先减少后增加。南粳9108和南粳5718分别在播种密度为112.5 kg/hm²和135.0 kg/hm²时产量最高。南粳5718的产量和外观品质好于南粳9108，但加工品质和口感不及南粳9108。

关键词: 水稻, 机械条播, 播种密度, 产量, 抗倒能力, 稻米品质