为了筛选出适宜当地种植的粮饲通用型玉米品种，推进临洮县玉米生产向粮改饲方向调整。以先玉335为对照，对12个玉米品种的生物产量、籽粒产量和营养品质进行比较。结果表明，陇单703、5291生物产量和籽粒产量均较高，干物质产量分别为20.04、17.70 t/hm2，鲜草产量分别为60.16、59.64 t/hm2，籽粒产量分别为16.08、17.74 t/hm2；青贮营养品质也较优，粗蛋白含量分别为99.4、85.9 g/kg，中性洗涤纤维含量分别为408.3、430.5 g/kg，酸性洗涤纤维含量分别为238.8、247.0 g/kg，淀粉含量分别为353.0、359.1 g/kg，均达到国际一级品种要求。以上2个品种可作为粮饲通用型玉米品种在临洮县推广种植。

In order to promote the adjustment of maize production in Lintao County towards the direction of grain for forage, dual-purpose maize varieties for local cultivation were selected. Using Xianyu 335 as the control, the forage yield, grain yield, and nutritive values of 12 maize varieties were determined. The results showed that Longdan 703 and 5291 had higher biomass and grain yields, with dry matter yields of 20.04 and 17.70 t/ha, fresh forage yields of 60.16 and 59.64 t/ha, and grain yields of 16.08 and 17.74 t/ha, respectively. The nutritional quality of silage using these two varieties was ideal with crude protein content of 99.4 and 85.9 g/kg, neutral detergent fibre content of 408.3 and 430.5 g/kg, acid detergent fibre content of 238.8 and 247.0 g/kg, and starch content of 353.0 and 359.1 g/kg, respectively, which all met the requirements of international first-class varieties. The above two varieties can be promoted and planted as dual-purpose maize varieties for grain and forage in Lintao County.

S513

定西市列科技项目(DX2020N04)。