Liu Wei, Lü Peng, Su Kai, Yang Jin-sheng, Zhang Ji-wang, Dong Shu-ting, Liu Peng, Sun Qing-quan
State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Tai' an 271018, Shandong, China.
Ying Yong Sheng Tai Xue Bao. 2010 Jul;21(7):1737-43.
Taking high-yielding summer maize cultivars Zhengdan 958 (ZD 958) and Denghai 661 (DH 661) as test materials, this paper studied the effects of different planting density (22500, 45000, 67500, 90000, and 112500 plant x hm(-2)) on the grain yield and source-sink characteristics of the cultivars in four regions, i.e., Shandong Agricultural University, Wenkou, Yanzhou, and Laizhou. At the planting density 112500 plant x hm(-2), the grain yield and the biomass of the cultivars were the highest, being 19132 and 36965 kg x hm(-2), respectively. Comparing with those at the planting densities 22500 and 67500 plant x hm(-2), the grain yield at the planting density 112500 plant x hm(-2) was increased by 72% and 48%, and the biomass was increased by 152% and 112%, respectively. With the increase of planting density, the leaf area index (LAI) increased significantly, while the leaf area per plant (LA), the maximum number of filaments, the grains per ear, and the 1000-grain weight all decreased. The harvest index and the grain-leaf ratio decreased with increasing planting density, but no significant change was observed when the planting density was higher than 67500 plant x hm(-2), suggesting that at higher planting densities, summer maize could improve their grain yield via increasing population sink.
以高产夏玉米品种郑单958（ZD 958）和登海661（DH 661）为试验材料，研究了山东农业大学、汶口、兖州和莱州四个地区不同种植密度（22500、45000、67500、90000和112500株·hm⁻²）对品种籽粒产量和源库特性的影响。在种植密度为112500株·hm⁻²时，品种的籽粒产量和生物量最高，分别为19132和36965 kg·hm⁻²。与种植密度为22500和67500株·hm⁻²时相比，种植密度为112500株·hm⁻²时的籽粒产量分别提高了72%和48%，生物量分别提高了152%和112%。随着种植密度的增加，叶面积指数（LAI）显著增加，而单株叶面积（LA）、花丝最大数量、穗粒数和千粒重均下降。收获指数和粒叶比随种植密度增加而降低，但当种植密度高于67500株·hm⁻²时未观察到显著变化，表明在较高种植密度下，夏玉米可通过增加群体库来提高籽粒产量。
