不同播期对套作玉米苗期生长的影响

研究了麦-玉-豆套作模式下,玉米不同播期对其苗期生长的影响。结果表明,适期早播能够提高种子出苗率和加快苗期的出叶速度,增加苗高和茎粗,增大叶面积和提高叶绿素含量,从而促进了叶片的光合能力,有利于叶片干物质的积累,保证了苗齐苗壮,为后期生长奠定了良好的基础。而晚播条件下,由于病虫害加重,造成苗体素质较差。初步得出临奥4号品种在当地的最适播期为3月28日。

The Influence of Sowing Date on Seedling Growth of Maize Interplanting

The influence of sowing date on seedling growth of maize in wheat/maize/ soybean cropping system was studied.The results proved that early sowing could promote germinating rate and quicken the process of leaf emergence,increase plant height and plant diameter,leaf area and content of chlorophylls,thereby the photosynthetic capa-city of leaf was accelerated.It can accumulate more dry matter,guarantee better growth of seedlings,which might be a great potential for maize growth at the later stage.But much late sowing resulted in slim seedlings because of the disease and pests.We preliminarily concluded that the best sowing date of Lin'ao 4 was march 28 in Ya'an.