Response of Water Radiation Utilization of Summer Maize to Planting Density and Genotypes in the North China Plain

Increasing the planting density of summer maize to improve utilization efficiency limited soil and water resources is an effective approach; however, how leaf water-use (WUEL), yield, RUE respond genotypes remains unclear. A 2-year field experiment was performed in North China Plain (NCP) investigate effects (high, 100,000 plants ha?1; medium, 78,000 low, 56,000 ha?1) (Zhengdan 958 Denghai 605) on area index (LAI), photosynthetic characteristics, dry-matter accumulation, WUEL, maize. The objective explore effect genotype WUEL boosted LAI, light interception, spike number but reduced chlorophyll content, net rate, transpiration 1000-kernel weight. Both high low densities were averse yield. Zhengdan increased by 19.45% compared with 605, 605 18.19% higher than 958, suggesting that had a greater production potential as increased. Our findings recommend using ha?1 maintain yields NCP.