利用乙烯利塑造夏玉米凹形冠层对产量及其相关性状的影响

以紧凑型玉米品种浚单20为试验材料,通过拔节期不同的乙烯利喷施处理塑造不同的冠层结构,考察其对生长发育及产量性状的影响。结果表明:隔带(以2行为一带)喷施乙烯利的处理(间喷处理)可以形成凹形冠层,在高密度条件下,凹形冠层比全矮冠层(全层喷施乙烯利,全喷处理)及常规冠层(全层喷水处理,对照)表现出明显的增产效果,间喷处理增加了群体内边行优势并改善了群体下层受光状态。研究认为,通过人为措施(如隔带化控和高矮品种带状间作)塑造凹形群体结构是进一步提高玉米群体生产力的重要途径。

Effects of Concave Canopy Structure Shaped with Ethephon on Yield and Its Correlated Characters in Summer Maize

Canopy structure has strong effects on grain yield in maize(Zea mays L.).In this paper,the effects of different canopy structure shaped on growth and development and yield charaters were studied in the compact maize Xundan20 to exprore the potential of improving maize population yield,by various Ethephon sprayed treatment at jointing.The results showed that the treatment of spraying Ethephon at intervals of two lines could shape a concave canopy,which showed a higher yield than the shorter canopy (spraying Ethephon at all lines) and the common canopy (control) at the high planting density.The mechanism of increasing production for concave canopy was that it could raise the edge effect in population and improve the light intensity on the lower leaves.It was considered that shaping the concave canopy structure by aitificial measures such as chemical control at intervals and belt-shape intercrop of tall and short cultivars could be an important way to further improve maize population yield.