DOI: 10.3724/SP.J.1006.2018.00278

Acta Agronomica Sinica (作物学报) 2018/44:2 PP.278-287

Effects of Planting Density on the Mechanical Harvesting Characteristics of Semi-winter Rapeseed

Two canola varieties (Zhongshuang 11 and Huayouza 9) with four planting densities (15×104, 30×104, 45×104, and 60×104 plants ha-1) were used to evaluate their effects on yield, lodging and pod shattering resistance index (PSRI). With the increase of plant density, effective pods per hectare increased, resulting in increasing yield. The highest yield was observed at density of 45×104 plants ha-1 for both of the two varieties. With the increase of plant density, the root crown diameter decreased which led lodging index to be increased. Under the densities of 15×104 and 30×104 plants ha-1, the part of stem below canopy had the highest lodging index, while under the densities of 30×104 and 45×104 plants ha-1, the central of stem and the upper part of middle stem had the highest lodging index, indicating that the lodging region was lower than under low plant density. The PSRI of branches was smaller than that of main stems, with a tendency of increasing firstly and then decreasing with decreasing branch height. The PSRI of main stem of the two varieties had different responses to increasing density, that was decreasing in Zhongshuang 11 while increasing firstly and then decreasing in Huayouza 9, with a highest PSRI under 300 000 plants ha-1. The water declining rate of pod wall from early pod development to pod maturity had highly significant and negative correlation with pod shattering resistance, indicating that this index is most important for density effects on pod shattering.

Key words:rapeseed (Brassica napus L.),planting density,yield,pod shattering,lodging

ReleaseDate:2018-03-08 10:13:40

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