不同收割时间对甜玉米秸秆的营养价值和青贮发酵品质的影响

为获得甜玉米秸秆的合理收割时间,研究了在冬季和夏季甜玉米摘穗后,其秸秆收割时间对营养成分及青贮品质的影响.在甜玉米摘穗后第0,3,6,9和12天收割并进行青贮,测定5个收割时间甜玉米秸秆的营养成分,青贮90 d后测定其青贮发酵品质.结果表明,冬季不同收割时间对甜玉米秸秆的粗蛋白、粗脂肪和无氮浸出物含量无显著影响(P＞0...

The nutrient components and ensilage fermentation quality of sweet corn stalks harvested at different times

The effect of harvest time on nutrient components and ensilage fermentation quality of sweet corn stalks in winter and summer were investigated.The stalks were harvested and ensiled on the day of ear harvest and the 3rd,6th,9th and 12th day after the harvest of corn ears.In winter the contents of crude protein,ether extract and nitrogen free extract in stalks were not significantly different between harvest times but the contents of water soluble carbohydrates and crude fiber in stalk harvested on the day of ear harvest were significantly greater than those harvested on the 9th day after ear harvest.The best fermentation quality was obtained when stalks were harvested on the 3rd day after the ear harvest.In summer,harvest time significantly influenced the nutrient components of stalks.The dry matter content of stalks rose significantly as the harvest time was delayed.The contents of crude protein and crude fiber in stalks were greatest on the day of ear harvest,but the contents of water soluble carbohydrates and nitrogen free extract were the lowest as was the score for silage quality.Sweet corn stalks had the best nutrient quality when harvested within 6 d after ear harvest in winter and within 9 d in summer,and had the best silage quality when harvested within 6 d in winter and during 3-9 d in summer.