不同播种密度对燕麦产量的影响

Effects of Different Sowing Densities on Avena Sativa Yield

为探明播种密度对燕麦产量的影响,以在南部祁连山区筛选出的适应性较好的‘定燕2号’和‘陇燕3号’燕麦品种为研究对象,测定了不同播种密度下两个燕麦品种的单茬鲜草产量和两茬累计鲜草产量。结果表明,当‘定燕2号’和‘陇燕3号’播种密度分别为315.0 kg/hm2和322.5 kg/hm2时,牧草产量最高;当播种密度继续增加时,牧草产量增加不明显(P>0.05)或有下降趋势;当播种密度≥210.0 kg/hm2时,‘定燕2号’和‘陇燕3号’两茬累计产量均显著高于单茬产量(P<0.05)。综上,在南部祁连山区,‘定燕2号’和‘陇燕3号’的最佳播种密度分别为315.0 kg/hm2和322.5 kg/hm2,在抽穗期刈割后进行二茬生长可以获得较高的鲜草产量。

In order to investigate the effect of sowing density on Avena sativa yield,Avena sativa‘Dingyan No.2’and‘Longyan No.3’were chosen as the research objects,which had been screened out in south Qilian Mountain,and fresh grass yield for one time cutting and total of fresh grass yield for two time cutting in two oat varieties under different sowing densities were measured.The results showed that the forage yield was the highest when the sowing densities of‘Dingyan 2’and‘Longyan 3’were 315.0 kg/hm2 and 322.5 kg/hm2,respectively.When the sowing density continued to increase,the forage yield was not significantly increased(P>0.05)or had a downward trend.When the sowing density was greater(or equal)than 210.0 kg/hm2,the cumulative yield of two time cutting for‘Dingyan 2’and‘Longyan 3’were significantly higher than those of the one time cutting(P<0.05).To sum up,in the southern Qilian Mountain,the best sowing densities of‘Dingyan 2’and‘Longyan 3’were 315.0 kg/hm2 and 322.5 kg/hm2,respectively,and high fresh grass yield could be obtained by cutting at heading stage and then growing for the second crop.