收获期对玉米茎秸产量和营养价值的影响

研究适于云南亚热带地区的玉米品种.结果表明:玉米青秸产量以蜡熟期最高,干秸产量以完熟期最高;粗蛋白质产量和产奶净能量(NEL)均以蜡熟期最高;专用青贮玉米、粮饲玉米和普通玉米蜡熟期鲜秸产量分别为108.9、111.7和127.5 t/hm2,干秸产量为33.4、36.4和40.7 t/hm2,粗蛋白质产量为2.7、2.9和3.4 t/hm2,产奶净能量为49825.8、57789.4和64430.3 Mcal/t/hm2;高产优质玉米品种为京科9号、樱红和路单4号.

Effect of Different Varieties and Harvesting Times on the Corn Yield and Nutrition

To develop dairy production in Yunnan Province,different varieties of corn have been introduced and planted in the province.A study to select the best corn varieties for the subtropical zone of Yunnan was conducted.The results show that the fresh stalk yield was the highest at dough stage,while dry matter yield topped at the corn entire-maturity stage.Yield of crude protein and net energy for lactating cow were the highest at the corn dough stage.There appeared no remarkable difference(P>0.05) between the content of crude protein at the corn dough stage and that at the entire maturity stage.Fresh stalk yield of the special silage corn,of the grain-feed corn,and of the commonly planted corn was 108.9,111.7,and 127.5 t/hm2 at the dough stage,respectively.The dry stalk yield of the three varieties was 33.4,36.4,and 40.7 t/hm2;crude protein yield,2.7,2.9,and 3.4 t/hm2;the net energy for lactating cow,49825.8,57789.4,and 64430.3 Mcal/t/hm2,respectively.Quality and high yield corn varieties are Jing-Ke No.9,Yinghong,and LuDan No.4.