【摘要】 以甜高粱（Sorghum dochna）吉甜5号和九甜杂3号为材料,在海拔2 040m的青海旱地覆膜进行了不同种植密度（行株距分别为40cm×40cm、40cm×30cm、40cm×20cm）和追施不同尿素量(0、150和225kg·hm^-2)对草产量及品质影响的研究。结果显示,吉甜5号和九甜杂3号两个品种在行距×株距为40cm×20cm(12.00万穴·hm^-2)时的鲜草产量和干草产量最高,鲜草产量分别达99.75和108.17t·hm^-2,干草产量分别达17.89和22.58t·hm^-2;在生长中期追施150kg·hm^-2尿素时草产量较高,品质较好,两个品种的粗蛋白分别达5.47%和4.80%,粗脂肪分别达5.67和7.57g·kg^-1,酸性洗涤纤维较低,综合表现良好。以上结果表明,青海旱地甜高粱种植密度为12.00万穴·hm^-2,生长中期追施尿素150kg·hm^-2最为适宜。更多还原

【Abstract】 In this experiment,Jitian 5 and Jiutianza 3 were used as materials in an experimental study on the effects of different planting densities.Linespacing×plant spacing:（40 cm×40 cm,40 cm×30 cm,40 cm×20 cm）and amount of urea(0,150,225 kg·ha^-1)in the topdressing on the yield and quality of sweet sorghum were studied at an altitude of 2 040 mon dry land in Qinghai by covering film cultivation.The results showed that the fresh and hay yields of two cultivars were the highest at the spacing of 40 cm × 20 cm(120 000 hole·ha^-1).The yield of fresh grass was 99.75 and 108.17 t·ha^-1.The hay yieldswere 17.89 and 22.58 t·ha^-1,respectively.The yield was higher and quality was better at 150 kg·ha^-1 urea at the jointing stage.The crude protein of the two cultivars was 5.47% and 4.80%,crude fat was 5.67 and 7.57 g·kg-1,acidic detergent fiber was low,and comprehensive performance was good.In conclusion,aplanting density of 120 000 hole·ha^-1 and topdressing urea of 150.0 kg·ha^-1 at the jointing stage are most suitable for sweet sorghum in the Qinghai dry land更多还原