不同种植密度对套作多花黑麦草生产性能的影响

Effect of planting density on production performance of Italian ryegrass in the mulberry and grass intercropping

为进一步完善桑-草套作模式技术,为生产应用提供科学依据,在桑-草套作模式下研究不同种植密度对不同多花黑麦草（Lolium multifolorum）品种生产性能的影响。结果表明,多花黑麦草‘海湾’随种植密度的增加株高增高,多花黑麦草‘杰威’随种植密度的增加株高降低;茎叶比在整个生育期呈＂升-降-升＂的趋势,且随着密度的增加而升高;多花黑麦草‘海湾’在套作条件下产量高于‘杰威’,最适密度为25.020 kg/hm2,在高密度下减产严重;多花黑麦草‘杰威’最适密度为25.020~30.015 kg/hm2。

The improvement of technical points of the intercropping will benefit scientific production and application.A field experiment was conducted to determine the effect of planting density on production performance of Italian ryegrass in the Mulberry and Grass intercropping.This study showed that the plant height of ＇Haiwan＇ increased with the increase of planting density,while the plant height of ＇Jiewei＇ decreased with the increase of planting density.During the growth period,stem/leaf ratio of Italian ryegrass increased,and then decreased,finally increased,and it increased with the increase of planting density.The yield of ＇Haiwan＇ was higher than that of ＇Jiewei＇ in the intercropping conditions,but ＇Haiwan＇ showed a weak density tolerance and showed a lower yield at the high density conditions,and its optimal density was 25.020 kg/ha.＇Jiewei＇showed a strong density tolerance,and its optimal density ranged from 25.020 kg/ha to 30.015 kg/ha.