Bulb development in onion (Allium cepa L.). IV. Influence on yield of radiation interception, its efficiency of conversion, the duration of growth and dry-matter partitioning
Bulb development in onion (Allium cepa L.). IV. Influence on yield of radiation interception, its efficiency of conversion, the duration of growth and dry-matter partitioning
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洋葱 (Allium cepa L.) 的鳞茎发育。
DOI：
10.1093/oxfordjournals.aob.a087200
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发表时间：
1986
期刊：
影响因子：
4.2
通讯作者：
G. Morris
中科院分区：
文献类型：
--
作者：
J. Brewster;F. Mondal;G. Morris
灌溉良好的洋葱作物球茎生长期间总干物质产量的增加与叶冠截获的总太阳辐射有关。拦截的辐射转化为干物质的平均效率为 1.58 g MJ−1。然而，季节之间的效率存在显着差异，三年中的两年春播作物的效率低于秋播作物。效率较低的时期与平均温度和辐照度较高的时期一致。较高的植物密度、较早的播种和晚熟的品种会增加球根期间冠层截获的总辐照度的百分比（1%）。春播作物的含量高于秋播作物，尤其是在植物密度较低的情况下。球茎生长的持续时间与1%呈负相关，并且与球茎生长期间的平均气温呈负相关。因此，秋播作物的球茎生长持续时间比春播作物更长，并且在高植物密度下产生异常高的球茎产量。与灌溉作物相比，非灌溉作物的球根生长率低1%，球茎生长持续时间也短，在平均气温和光照较高的季节，转化效率也较低。
Increases in total dry-matter yield during bulb growth in well-irrigated onion crops were correlated with the total solar radiation intercepted by the leaf canopy. The mean efficiency of conversion of intercepted radiation to dry-matter was 1.58 g MJ−1. However, efficiencies were significantly different between seasons and in two years out of three they were lower for spring-sown crops than for autumn-sown crops. The lower efficiencies coincided with periods of high mean temperature and irradiance. The percentage of the total irradiance intercepted by the canopy during bulbing (1%) was increased by higher plant densities, earlier sowing and in later-maturing cultivars. It was higher in spring-sown than in autumn-sown crops especially at low plant densities. The duration of bulb growth was negatively correlated with 1% and with the mean air temperature during bulb growth. Consequently autumn-sown crops had a longer duration of bulb growth than spring-sown crops and produced exceptionally high bulb yields at high plant densities. Non-irrigated crops had a lower 1% and a shorter duration of bulb growth than irrigated crops, and a lower conversion efficiency in a season of high mean temperature and irradiance.