播期对盆周山区玉米产量的影响

目的]研究播期对玉米高产机制的影响,并探讨不同品种玉米的最适播期。方法]采用二因素裂区设计试验,通过形态指标动态变化的测定和产量的测定,研究了4个播期对3个玉米品种（川单428、正红311、川单418）叶片生长特性和产量构成因素的影响。结果]在盆周山区,3个玉米品种的平均产量在播期为3月27日的最高,达6 565.84 kg/hm2,比其他3个播期（4月6日、3月17日和4月16日）高2.02%、8.18%和14.53%。适期（3月27日）播种,玉米的穗粒数和千粒重均较高 叶面积指数较高,且与其他播期差异显著 叶绿素相对含量也较高,前期上升幅度大后期下降缓慢。结论]播期对玉米生长特性和产量构成因素影响重大,最适播期均在3月27日左右。

Impact of Sowing Periods on the Yield of Maize in Penzhou Maintain Area

Objective] The study aimed to research the effect of sowing period on high yield mechanism of maize and research the optimum sowing period of different maize varieties.Method] The test with two factors spilt plot design was used to research the effect of 4 sowing periods on the leaf growing feature and yield component factors of 3 maize varieties(Chuandan 428,Zhenghong 311 and Chuandan 418) through the determination on dynamic change of morphological index and yield.Result] In the Penzhou maintain area,the average yield of 3 maize varieties was highest when the sowing period was in the March 27,reaching 6 565.84 kg/hm2,which was 2.02%,8.18% and 14.53% higher than that in other 3 sowing periods(April 6,March 17 and April 16).Under optimum sowing period(March 27),the grains per spike and 1000-grain weight of maize were all higher;the index of leaf area was higher and its difference was remarkable when comparing with that in other sowing periods;the relative content of chlorophyll was higher with great rising amplitude in prophase and slow decrease amplitude in anaphase.Conclusion] The sowing period had great effect on maize growing feature and yield component factors and the optimum sowing period was around March 27.