新麦草种子产量及其构成因素与播量的关系

Relationship between Sowing Rate of Psathyrostachys Juncea Nevski and Seed Yield and Its Components

为了探索提高新麦草种子的最佳播种量,在呼图壁旱生牧草基地,采用单因素随机区组设计开展不同播种量对新麦草种子、干草产量及其构成因素的影响研究。试验结果表明,播种量为0.50 kg/666.67 m^2时,2014-2015年的种子产量均达到最高值,分别为49.91 kg/666.67 m^2和22.26 kg/666.67 m^2,显著高于其他播量水平,且两年间的种子产量差距很大。新麦草收种后还可刈割利用两茬草,在播量0.75 kg/666.67 m^2水平下,第一年干草总产值最高可达891.61 kg/666.67 m^2,第二年的头茬干草产量也能达到231.23~300 kg/666.67 m^2,具有一定的潜在经济效益。相关分析表明,播量与第一年种子亩产量和生殖枝数之间存在显著负相关关系,第一年种子亩产与生殖枝数呈显著正相关,播量越小,生殖枝数、小穗数越多,种子产量也越高。在呼图壁平原荒漠区建立新麦草种子田的最佳播种量为0.50 kg/666.67 m^2。

In order to explore the optimal sowing rate of Psathyrostachys Juncea Nevski seeds,the effects of different sowing rates on the yield and components of seeds and hay were studied in Hutubi dry pasture base by single factor random block design.The results showed that when the sowing rate was 0.50 kg/666.67 m^2,the seed yield during 2014 to 2015 reached the highest(49.91 kg/666.67 m^2 and 22.26 kg/666.67 m^2 respectively),which were significantly higher than other sowing rates,and there was a big gap in seed yield between the two years.After the seeds were harvested,two crops of grass can be mowed and used,under the sowing rate of 0.75 kg/666.67 m^2,the highest hay output in the first year can reach 891.61 kg/666.67 m^2,and the first crop hay yield in the second year can also reach 231.23~300 kg/666.67 m^2,which has certain potential economic benefits.Correlation analysis showed that there was a significant negative correlation between the sowing rate and the seed yield per mu and number of reproductive branches in the first year,and the seed yield per mu and the number of reproductive branches in the first year were significantly positively correlated,the smaller the seeding rate,the smaller the number of reproductive branches and spikelet,the higher the seed yield.In conclusion,the optimal sowing rate for establishing new Psathyrostachys Juncea seed fields in the desert area of Hutubi plain desert area was 0.50 kg/666.67 m^2.