水稻旱育秧的移栽密度对群体结构和光能利用的影响

• 作 者: 赵国平 陈志银 张国平 Ａｏｍａｎｇｄｉ
• 机 构: 浙江农业大学农学系
• 出 处: 浙江农业大学学报
• 发表日期: 1998年04期
• 关键词: 移栽密度 水稻旱育秧 群体结构 光能利用 双季早稻 适宜密度 产量构成 穗粒重 叶面积指数 叶层

研究了早稻旱育秧不同移栽密度的群体结构、光能分布与利用特性及产量构成，结果表明：移栽密度较低时，群体的分蘖高峰期推迟，有效分蘖期延长，且旱育秧群体有较强的自动调节能力．双季早稻的适宜密度为２３．３ｃｍ×１３．３ｃｍ；孕穗期群体叶面积的垂直分布状况因移栽密度而异，１６．７ｃｍ×１３．３ｃｍ，２３．３ｃｍ×１３．３ｃｍ的叶面积以３０～４５ｃｍ层为最大，３０．０ｃｍ×１３．３ｃｍ的最大叶面积出现在４５～６０ｃｍ层；群体的漏光率随移栽密度的提高而变小，光能吸收率随太阳高度的增大而减小，随密度提高而增大．栽植密度２３．３ｃｍ×１３．３ｃｍ的产量显著高于１６．７ｃｍ×１３．３ｃｍ，２０．０ｃｍ×１３．３ｃｍ和３０．０ｃｍ×１３．３ｃｍ，这与其穗粒重协调发展有关．

The population structure, light energy distribution, utilization characteristics and yield composition of different transplanting density of early rice dry seedling were studied. The results showed that when the transplanting density was low, the peak tillering of the population was delayed and the effective tillering stage was prolonged. Strong automatic adjustment ability. The suitable density of double-season early rice was 23.3 cm × 13.3 cm. The vertical distribution of leaf area at booting stage varied with the transplanting density. The leaf area of ​​16.7 cm × 13.3 cm and 23.3 cm × 13.3 cm The maximum leaf area of ​​30.0 cm × 13.3 cm appeared in the layer of 45-60 cm. The light leakage rate of the population decreased with the increase of transplanting density. The light energy absorption rate increased with the increase of solar height Reduce, increase with increasing density. The yield of planting density 23.3cm × 13.3cm was significantly higher than that of 16.7cm × 13.3cm, 20.0cm × 13.3cm and 30.0cm × 13.3cm, which was related to the spikelets re-development.