榆阳沙区20个青贮玉米品种的筛选及综合性状评价

Screening and comprehensive character evaluation of 20 silage maize varieties in Sandy area of Yuyang

试验旨在筛选出适宜榆阳风沙草滩区种植的青贮玉米品种。选取20个玉米品种作为试验材料,对其农艺性状(生育期、株高、穗位、茎粗、绿叶数)、生物产量、营养品质(粗蛋白、酸性洗涤纤维、中性洗涤纤维、相对饲喂价值、饲草分级指数)等指标进行分析比较。结果显示,从生物产量方面分析,大京九26、曲晨9的鲜草产量超过7000kg/667m^(2),分别为7272.69、 7395.76kg/667m^(2), NK815鲜草产量最低为5 419.26 kg/667 m^(2);大京九166的干草产量最高,达到1 813.04 kg/667 m^(2),洛白糯2号的干草产量最低,为1 344.52 kg/667 m^(2)。从品质测定方面分析,20个参试品种的粗蛋白含量均高于7%,其中京科665含量最高为9.79%,鲁星糯1号含量最低为7.84%;20个参试品种的中性洗涤纤维、酸性洗涤纤维含量范围是14.36%~37.98%、34.10%~58.83%。基于灰色关联度综合分析,京科665、大京九166、大京九4059、NK815适宜在榆林风沙草滩区大面积推广种植。

The experiment was to select the suitable corn silage varieties for planting in the wind-sand grassy flat area of Yuyang.Twenty corn varieties were selected as experimental materials,and their agronomic traits(growth period,plant height,ear position,stem diameter,number of green leaves),biological yield,nutritional quality(crude protein,acid,neutral washing fiber,relative feeding value,forage classification index)were analyzed and compared.The results showed that in terms of biological yield,the fresh grass yield of Dajing Jiu 26 and Quchen9 exceeded 7000 kg/667 m^(2),which were 7272.69 and 7395.76 kg/667 m^(2),respectively,NK815 had the lowest fresh grass yield,which was 5419.26 kg/667 m^(2).The hay yield of Dajing Jiu 166 was the highest,reaching 1813.04 kg/667 m^(2),and that of Luobainuo 2 was the lowest,reaching 1344.52 kg/667 m^(2).In terms of quality measurement,the crude protein content of 20 tested varieties was higher than 7%,the highest content of Jingke 665 was 9.79%,and the lowest content of Luxinguo 1 was 7.84%.The content of neutral detergent fiber and acid detergent fiber were 14.36%~37.98%and 34.10%~58.83%,respectively.Based on the comprehensive analysis of grey correlation degree,the Jingke 665,Dajing Jiu 166,Dajing Jiu 4059 and NK815,which are suitable for large-scale popularization and planting in Yulin.