作物学报2018，Vol.44Issue(2)：278-287,10.DOI:10.3724/SP.J.1006.2018.00278
种植密度对油菜机械收获关键性状的影响
Effects of Planting Density on the Mechanical Harvesting Characteristics of Semi-winter Rapeseed
摘要
Abstract
Two canola varieties (Zhongshuang 11 and Huayouza 9) with four planting densities (15 × 104, 30 × 104, 45 × 104, and 60 × 104plants 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 × 104plants ha–1for 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 × 104and 30 × 104plants ha–1, the part of stem below canopy had the highest lodging index, while under the densities of 30 × 104and 45 × 104plants 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 Zhong-shuang 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.关键词
油菜/种植密度/产量/裂角/倒伏Key words
rapeseed(Brassica napus L.)/planting density/yield/pod shattering/lodging引用本文复制引用
李小勇,周敏,王涛,张兰,周广生,蒯婕..种植密度对油菜机械收获关键性状的影响[J].作物学报,2018,44(2):278-287,10.基金项目
本研究由国家科技支撑项目(2014BAD11B03),国家现代农业产业技术体系建设专项(NYCYTC-00510)和高校自主科技创新基金(2013PY001)资助.This study was supported by the National Key Technology R&D Program of China(2014BAD11B03),the China Agriculture Research System(NYCYTC-00510),and the Fundamental Research Funds for Central Universities(2013PY001). （2014BAD11B03）
