混播对不同基因型玉米产量和农艺性状的影响

Effects of Mixed Planting on Yield and Agronomic Traits of Different Genotypes of Maize

通过大田试验,比较研究了不同基因型玉米混播时的竞争能力及其与产量之间的关系。结果表明:①混播在竞争条件下4个玉米品种的产量均低于其单播条件;②竞争可以使植株叶夹角降低,叶向值增大,复合群体的叶面积降低,减小了光合吸收面积,不利于产量的提高;③竞争条件下植株生育后期的净光合速率低于单播条件;④竞争条件下紧凑型玉米品种ZD958穗位高/株高降低,茎粗增大,植株抗倒能力增强。紧凑型玉米品种ZD958在4个玉米品种中具有较强的竞争能力。

A field trial was carried out to study the competitive ability and its relationship with yield of different genotypes of maize by mixed planting.The results showed that competition could decrease the leaf angle,leaf area and photosynthetic absorption area and increase the leaf orientation value（LOV）,which was not conductive to increase the yield,so the yields of 4 genotypes of maize by mixed planting were lower than those by sole-cropping.The photosynthetic rate（Pn） of plants under the competition was lower than that by sole-cropping at the late growth stage.The ratio of ear height to plant height of compact type maize variety ZD958 decreased,but the stem diameter and the lodging resistance increased under the competitive condition.The competitive ability of ZD958 was the highest in the 4 genotypes of maize.