种植密度对玉米主要农艺性状的影响

Research on Agronomic Characteristics with Planting Density of Maize

[目的]为四川丘陵区玉米合理密度提供科学依据。[方法]以川单418和科茂918为试验材料,在42 000、48 000、54 000、60 000和66 000株/hm^2种植密度下,研究四川丘陵区种植密度对川单418和科茂918 2个玉米品种产量等主要农艺性状的影响。[结果]两个品种产量的种植密度效应基本相同,产量随着种植密度增加先升后降;种植密度的增加,川单418和科茂918的穗长、行粒数、穗粒数和千粒重均呈下降趋势,而秃尖长、倒伏率呈上升趋势。[结论]科茂918可适当增加种植密度;川单418密植倒伏严重,其种植密度不应超过60 000株/hm^2。

[Objective] This study provided scientific basis for the rational close planting of maize in the Sichuan hilly area. [Methodl Two maize varieties,Chuandan 418 and Kemao 918 were planted in the five different densities （4.2×10^4, 4.8×10^4, 5.4×10^4, 6.0×10^4 and 6.6×10^4 plants ha-1）, the effects of the density on grain yield and other major agronomic traits were studied in this article. [Result] Effects of planting density on two varieties was basically the same. With the increase of planting density, the yield was increased first and then decreased; and, ear length, kernels per row, kernels per ear and 1 000-kernel weight increased, but barren tip and lodging rate decreased. [Conclusion] Suitablly increased density can improved Kemao 918, but lodging of Chuandan 418 were serious, it were not fit for planting over 60 000 plants ha-1.