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土壤温度是限制玉米高产的主要环境因子,为了寻求合理的播种时间,使玉米生长发育处于适宜的土壤温度环境中,从而保证干物质的积累和产量的形成。通过开展不同播期对大田地膜春玉米进行试验。结果表明,营养生长期不同播期处理各层次地温均随生育进程的推进呈逐渐升高的趋势,拔节之后即进入生殖生长期,地温呈降低趋势。在西北内陆河流域第二播期(4月20日)生长状况好,干物质累积量高,尤其是乳熟期和成熟期差异明显。第二
Soil temperature is the main environmental factor that limits the yield of corn. In order to seek a reasonable sowing time, the growth and development of corn are in suitable soil temperature environment so as to ensure the accumulation of dry matter and the formation of yield. Daejeon mulched spring corn was tested by different sowing dates. The results showed that the ground temperature at different stages of sowing in vegetative growth stages increased gradually with the advancing of the reproductive stage. After entering the reproductive stage after jointing stage, the ground temperature showed a decreasing trend. In the second sowing season (April 20), the inland river basins in northwestern China had good growth status, high dry matter accumulation, especially the difference between milk ripening stage and mature stage. second