云南热区纳罗克非洲狗尾草种子生产田最佳株丛密度筛选

Screening of the Best Plant Density in the Seed Production Field of Setaria sphacelata cv.“Narok”, Yunnan Tropical Region

“纳罗克”非洲狗尾草是中国中亚热带至暖温带地区重要的饲草资源和环境治理材料。因其种子产量低,发芽率不高,限制了该优良禾草在我国南方地区的栽培利用。为提高该优良牧草兼地被植物的种子生产性能,设计60cm×60cm^110cm×110cm共11个株行距,育苗移栽,建立种子生产试验田,观测其生产性能。结果表明:不同株行距对“纳罗克”非洲狗尾草的株高、分蘖数、穗长、种子产量以及秸秆产量均有不同程度的影响;在云南热区,“纳罗克”非洲狗尾草种子田的最佳株行距为60cm×70cm^70cm×70cm,此时株高2m,单株分蘖100余个,穗长37cm左右,种子和秸秆产量分别高达160kg/hm 2·年和20000kg/hm 2·年左右。

Setaria sphacelata cv.“Narok”is an vital forage resource and environmental management material in Chinese mid-subtropical to warm temperate regions.Because of its low seed yield and low germination rate,the cultivation and utilization of this fine grass in southern China are limited.In order to improve the seed production performance of this fine herbage and ground cover plant,11 plant spacing of 60cm×60cm^110cm×110cm were designed,seedlings were transplanted,and a seed production test field was established,to observe its production performance.The results showed that different plant spacing affected the plant height,tiller number,ear length,seed yield,and straw yield of Setaria sphacelata cv.“Narok”to varying degrees.In the Yunnan hot area,the best row spacing is 60cm×70cm^70cm×70cm.At this time,the plant height can reach 2 m,with more than 100 tillers and 37cm ear length.The annual seed and hay yields are about 160kg/hm 2 and 20000kg/hm 2,respectively.