种植密度对鲁单981产量及其产量建成的影响

Effects of Plant Densities on the Yield and Yield Shaping of Ludan 981

选用生产上推广面积较大的高秆大穗型玉米品种鲁单981,研究了不同种植密度对其产量和产量构成因素等性状的影响。结果表明,随着种植密度增加,玉米个体产量、主要产量相关性状、单株地上部干物质积累量、单株叶面积以及群体消光系数均呈现降低的趋势,群体地上部干物质积累量和群体叶面积指数则呈现升高趋势。高秆大穗型玉米品种种植密度为45000-60000株/hm^2时,可构建较合理的群体结构,群体净同化率高,可获得较高的玉米群体产量。

The effects of different plant densities on the yield and yield shaping was studied on maize with Ludan 981 which represents the maize high plant and big ear type , and which is planted largely in practice. The results showed that the grain yield per plant, the main individual yield characters, the above-ground dry material accumulation in individual plant, the leaf area of plant and the canopy extinction index all decreased, then the above-ground dry material accumulation in canopy and the canopy leaf area index（LAI） increased. When the plant densities of the maize which represented high plant and big ear type was from 45 000 株/hm^2 to 60 000 株/hm^2 , high canopy yield could be gained because which could set up reasonable canopy frame and improve canopy assimilation rate.