种植密度和多茬收割对不同品种饲用型甜高粱产量的影响

Effect of Plant Density and Cutting Frequence on Different Sorghum Cultivars Forage Yield

以22个饲用型甜高粱品种为试材,在开展品比试验的基础上,研究了在3个不同种植密度下各品种农艺性状表现及生物产量影响;单茬收割和多茬收割对生物产量影响。结果表明:5个饲用型甜高粱品种在25cm的覆膜密度种植下,其生物产量最高,20cm次之,30cm最低;在25cm覆膜密度种植模式下,年刈割2茬比年刈割1茬亩生物产量平均提高35.16%;牛魔王、绿巨人、大力士3个饲用型甜高粱品种较其他品种株高茎粗、分蘖能力强,生物产量高,综合表现突出,适宜张掖市灌溉农业区大面积推广种植。

This experiment was conducted to determine the effects of different planting densities of different varieties of sorghums on agronomic traits and biomass yield. 22 varieties sorghums were designed at three planting densities. The results showed that five sorghums varieties on film planting density of 25cm get the highest biomass,followed by 20cm and 30cm. In addition,in the 25cm film density planting mode,biomass per acre cutting twice a year increased by 35.16% than that once a year. Taking plant height, stem diameter, tiller, and forage yield into consideration, Niumowang, Lvjuren and Dalishi were suit- able to plant widely in Zhangye irrigated agricultural area.