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以农华101为材料,在5个播期条件下研究各生育时期玉米养分含量的变化以及不同养分含量的变化与气象条件之间的关系。结果表明,不同播期处理下各生育阶段植株氮、磷、钾养分含量的变化与该阶段相对积温以及相对日照时数之间呈显著负相关,其拟合曲线表达式为y=1/a+bxc。不同气象条件下,玉米整个生育进程中植株干物质积累的差异是造成养分含量显著差异的主要原因。
Using Nonghua 101 as material, the changes of nutrient contents of maize and the relationship between different nutrient contents and meteorological conditions were studied under five sowing dates. The results showed that there was a significant negative correlation between the changes of N, P, K contents and the relative accumulated temperature and the relative sunshine hours at different growth stages. The fitting curve was y = 1 / a + bxc. Under different weather conditions, the difference of dry matter accumulation in maize during the whole growth process is the main reason for the significant difference in nutrient content.