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首页> 美国卫生研究院文献>Scientific Reports >The yield of mechanically harvested rapeseed (Brassica napus L.) can be increased by optimum plant density and row spacing
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The yield of mechanically harvested rapeseed (Brassica napus L.) can be increased by optimum plant density and row spacing

机译：机械收割的油菜籽（甘蓝型油菜）的产量可通过优化植物密度和行距来提高

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摘要

To determine the effects of plant density and row spacing on the mechanical harvesting of rapeseed (Brassica napus L.), field experiments were conducted. Higher plant density produced fewer pods and reduced the yield per plant. Wider row spacing at higher plant densities increased seeds per pod and the 1000-seed weight, resulting in a higher yield per plant. The highest yields were achieved at a density of 45 × 104 plants ha−1 (D45) in combination with 15 cm row spacing (R15) because mortality associated with competition increased as both the plant density and row spacing increased. The leaf area index (LAI) and pod area index (PAI) showed similar relations to the yield per hectare, and they were positively correlated with the percentage of intercepted light, whereas the radiation use efficiency (RUE) was positively correlated with population biomass. Reduced plant height and increased root/shoot ratios led to a decreased culm lodging index. Improved resistance to pod shattering was also observed as plant density and row spacing increased. The angle of the lowest 5 branches decreased as row spacing increased under D30 and D45. All of these structural changes influenced the mechanical harvesting operations, resulting in the highest yield of mechanically harvesting rapeseed under D45R15.
机译：为了确定植物密度和行距对油菜籽（Brassica napus L.）机械收割的影响，进行了田间试验。较高的植物密度产生的豆荚更少，单株产量降低。在较高的植物密度下，更宽的行距增加了每个荚果的种子数量和1000粒种子的重量，从而提高了单株植物的产量。密度为45×10 4 的植物ha -1 （D45）与15 cm行距（R15）相结合可实现最高产量，因为与竞争相关的死亡率增加随着植物密度和行距的增加。叶面积指数（LAI）和豆荚面积指数（PAI）与每公顷产量显示相似的关系，它们与拦截光的百分比呈正相关，而辐射利用效率（RUE）与种群生物量呈正相关。降低株高和增加根/茎比导致降低茎秆倒伏指数。随着植物密度和行距的增加，还观察到了对荚果破碎的增强抵抗力。在D30和D45下，最低的5个分支的角度随着行间距的增加而减小。所有这些结构变化都会影响机械收割操作，从而导致D45R15下机械收割油菜籽的最高产量。

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