种植密度对武陵山区夏玉米生长和产量的影响

Influence of Planting Density on the Growth and Yield of Summer Maize in Wuling Mountain Area

为了研究种植密度对武陵山区夏玉米生长和产量的影响,设置5.14万株/hm^2(现有正常密度)、5.98万株/hm^2、6.55万株/hm^2、7.08万株/hm^2 4个田间密度进行了试验。结果表明,各种植密度生育进程基本相同,群体干物质增长速度具有低密度前慢后快和高密度前快后慢的特点,各种植密度群体最终总生物量差别不大。种植密度和产量呈抛物线变化趋势,通过种植密度的增加,以促使群体生物量转化为产量,试验中设置的3个较高密度较正常密度增产8%~14%,以种植密度6.55万株/hm^2产量最高。

In order to study the effect of planting density on the growth and yield of summer maize in Wuling mountain area,4 field density tests were carried out by setting 4 densities of 51 400 plants/hm^2（normal density）,59 800 plants/hm^2,65 500 plants/hm^2,70 800 plants/hm^2. The results showed that the growth processes of different density were basically the same. The colony dry matter of lower density increased relative slowly in early stage and fast in later period, and the colony dry matter of higher density showed opposite trend. The final total biomass of each density had no significant difference. Density and yield showed a parabolic trend. The increase of sinks was beneficial to the transformation of population biomass into yield.The yield of three higher density treatments in the experiment were 8%~14% higher than the normal density. The yield with the density of 65 500 plants/hm^2 was the highest.