关键词: 混播, 产量, 饲用品质

Abstract: The north region of Heilongjiang Province is characterized with high latitude,cold weather and short frost-free period.The majority of late-maturing silage corn(Zea mays L.) varieties planted in that region has to be reaped in the inappropriate harvest period resulting in immature seed and low nutrient content and seriously affecting the quality of silage.Although the seed production of most early-maturing silage corn varieties has better maturity,low biomass can not meet the production demand.By mixing silage corns of different maturation periods,late-maturing varieties can ensure higher fresh yield and early-maturing varieties can improve seed production,thus improving the quality of silage to achieve the purpose of high-quality output.The study was conducted to investigate the effect of mixed planting on the agronomic traits,yield,and feeding value of different types of silage corn varieties including 1 late-maturing corn Z.mays cv.Zhongyuandan No.32 and 4 early-maturing corns Z.mays cv.Longdan No.13,Z.mays cv.Longdan No.8,Z.mays cv.Haiyu No.9,and Z.mays cv.Haiyu No.8 through separate and mixed planting experiments.The results show that the mixed planting didn’t significantly affect agronomic traits but significantly increased the dry matter yield and feeding value.The mixed planting of Zhongyuandan No.32 and Haiyu No.9 had the highest evaluation index according to the milk2000 evaluation index analysis.

Key words: Mixed planting, Yield, Feeding value