玉米群体根系活力与物质积累及产量的关系

Relationship of Root Activity to Dry Matter Accumulation and Grain Yield in Maize(Zea mays L. )

以玉米中熟种苏玉9号为材料,通过施氮量和种植密度处理,研究群体根系伤流强度动态和节根组成与物质积累、产量构成的关系.结果表明:玉米群体气生根数与节根量、灌浆结实期根系伤流强度、总粒数、抽丝后干物质积累量及产量呈正相关.生育过程中抽丝期的群体根系伤流量强度与抽丝后于物质积累量、总干物质积累量及籽粒产量相关最密切.气生根的多少和抽丝期根系伤流强度的高低可作为玉米高产栽培群体质量的诊断指标.

The experiments with different densities and fertilizer levels were carried out on corn hybrid SuYu9 to investigate the activity of root system relating to dry matter accumulation and grain yield. The results showed that there were positive correlations between brace root number and total root number, root flux activity during grain filling stage, dry matter accumulation and grain yield of the population. The root flux activity at silking stage had most significantly positive relation with dry matter accumulation during grain filling and grain yield. Therefore, the number of brace roots could be used as an indicator of root system and root activity during grain filling stage for high yield cultivation.