对扬州地区不同播量多花黑麦草生产性能的研究

Effects of different sowing rates on productive performance of ryegrass in Yangzhou

以多花黑麦草"特高"为材料,研究了5个不同播量水平1.5,2.0,2.5,3.0和3.5 g/m2对其生长特性及产量的影响。结果表明:不同播种量下,全年生长高度和生长速度不同,播量为3.5 g/m2时全年生长高度最高为268.04 cm,生长速度最快1.75 cm/d;随着播种量的增加分蘖能力有下降趋势,播量为1.5 g/m2分蘖能力最强,平均每20 cm样段有分蘖235.56个;播种量不同鲜草产量不同,2.5 g/m2产量最高为93 972.89 kg/hm2;当播种量大于2.5 g/m2时,鲜草产量呈下降趋势,播种量为2.5 g/m2易获得高产稳产。

The growth characteristic and yield of ryegrass（Lolium muldflorum var.Westerwoldicum cv.Tetragold）were studied with different sowing rates（1.5 g/m2,2.0 g/m2,2.5 g/m2,3.0 g/m2and 3.5 g/m2）.The results showed that the height and growth rate were different at different sowing rates.The highest height of the ryegrass was 268.04 cm and the fastest growth rate was 1.75 cm/d at sowing rates of 3.5 g/m2.The tiller ability was declined with the decrease of sowing rates and the tiller number was 235.56 per 20 cm at the sowing rate of 1.5 g/m2.The fresh yield was affected by different sowing rates and it was highest yield of 93 972.89 kg/hm2 at sowing rate of 2.5 g/m2.When the sowing rates was higher than 2.5 g/m2,the fresh yield was decreased.