刈割次数与留茬高度对内农1号苏丹草产草量和品质的影响

Effect of Different Clipping Frequencies and Stubble Height on the Yield and Quality of Sorghum Sudanense Stapf. cv. Neinong No.1

研究刈割次数和留茬高度对内农1号苏丹草(SorghumsudanenseStapf.cv.NeinongNo.1)产草量及品质的影响。结果表明:在生育期间,刈割3次粗蛋白质产量最高,达到3.24t/hm2;刈割2次鲜草产量最高(96.80t/hm2);刈割1次干草产量最高(35.04t/hm2);留茬以8cm为宜,鲜草、干草及粗蛋白质产量分别达105.11、27.64和3.29t/hm2,高于或低于8cm均影响其再生速度、产草量和粗蛋白质含量。

A study of the effect of different clipping frequencies and stubble height on the yield and quality of Sorghum sudanense Stapf. cv. Neinong No.1 indicated that: when clipping 3 times during the grass growing period, the crude protein yield was the highest (3.24 t/hm^2). The green forage yield of two-time-clipping was the highest reaching 96.80 t/hm^2. Clipping only once ascended the hay yield to 35.04 t/hm^2, topping all. Leaving the stubble at an optimal height of 8 cm enhance the aftermath yield of green forage, hay, crude protein to 105.11 t/hm^2, 27.64 t/hm^2 and 3.29 t/hm^2 respectively. Stubble that was higher or lower that 8 cm hindered the speed of grass regrowth, the yield of forage and its content of crude protein.