宽幅条播和种植密度对燕麦抗倒伏性及产量的影响

为明确宽幅条播对燕麦抗倒伏性和产量的调节作用及其适宜种植密度,于2019-2020年,通过裂区试验,设置2种播种方式(宽幅条播和常规条播)和三个种植密度水平[300×104株·hm-2 (D1)、450×104株·hm-2(D2)、600×104株·hm-2 (D3)],分析了播种方式与种植密度对燕麦植株抗倒伏性和籽粒...

Effect of Wide Range Drilling and Planting Density on Lodging Resistance and Yield of Oat

In order to explore the regulating effect of wide range drilling on lodging resistance and yield of oat,wide range drilling and conventional drilling were set up in 2019-2020,with three planting densities including 300×10 plants·hm^-2(D1),450×10 plants·hm^-2(D2),and 600×10 plants·hm^-2(D3). The effects of planting methods and planting density on oat lodging resistance and grain yield were studied. The results showed that the mechanical strength,stem thickness and wall thickness of stalk under wide range drilling were significantly higher than those under conventional drilling,while the plant height,center of gravity height and internode length were lower than those under conventional drilling. At grain filling stage,compared with conventional drilling,mechanical strength of the second basal internode of wide drilling oat was increased by 9.3%,11.6% and 17.0%; stem diameter was increased by 7.3%, 7.6%and 7.3%; plant height was decreased by 2.3%,1.9% and 3.0%; and gravity center height was decreased by 6.5%,7.8% and 6.0%,respectively. Compared with conventional drilling,oat wide range drilling increased yield mainly by increasing panicles. Under D1,D2 and D3,the two-year average yield of wide range drilling was increased by 8.6%,9.3% and 14.5%,respectively. With the increase of planting density,the mechanical strength,stem diameter and wall thickness of oat stem were decreased,and the plant height,center of gravity height and internode length were increased,but the chenges under wide range drilling were less than those under conventional drilling. Therefore,the lodging resistance and grain yield of oat can be significantly improved by wide strip sowing in production,and the synergistic increase of lodging resistance and grain yield can be achieved by appropriately increasing planting density; under the experimental conditions,the highest yield density of oat by wide range drilling is 600×10 plants·hm^-2.