title: [Individual grain yield potential and nitrogen utilization efficiency of Zea mays cultivars widely planted in North China].
abstract: With field experiment and under low-density condition, this paper studied the individual grain yield (GY) and nitrogen utilization efficiency (NUE) of fifty Zea mays cultivars widely planted in North China since 1990s. Exploring analyses and normality tests showed that the 1000-kernal weight (KW), above-ground biomass per plant (AB), grain harvest index (HI(G)), NUE, and nitrogen harvest index (HI(N)) were all conformed to normal distribution, with N (265.1, 44.50(2)), N (322.3, 36.91(2)), N (515.8, 64.73(2)), N (0.514, 0.06(2)), N (43.0, 5.37(2)), and N (0.643, 0.06(2)), respectively. The GY ranged from 198.35 to 345.22 g.plant(-1), KW from 241.50 to 391.82 g.1000 kernal(-1), AB from 402.34 to 712.84 g.plant(-1), HI(G) from 0.39 to 0.63, NUE from 31.18 to 57.35 g grain.g N(-1), and HI(N) from 0.47 to 0.74. Correlation analyses indicated that GY positively and significantly correlated with NUE (partial correlation coefficient was 0.471, P = 0.001), while KW negatively and significantly correlated with NUE (Pearson correlation coefficient was -0.427, P = 0.002). Through hierarchical cluster analyses for GY and NUE, the test Zea mays varieties could be sorted into 3 types, i.e., high-GY with high-NEU, low-GY with low-NEU, and mediate type. Currently, only 24 percent of Zea mays cultivars in North China were of high-GY with high-NEU type, and thus, its breeding should be strengthened in the future.
authors.affiliation: Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China. kjwang@sdau.edu.cn
authors.forename: Kongjun
authors.initials: K
authors.lastname: Wang
authors.forename: Jiwang
authors.initials: J
authors.lastname: Zhang
authors.forename: Yuqiu
authors.initials: Y
authors.lastname: Guo
authors.forename: Changhao
authors.initials: C
authors.lastname: Hu
authors.forename: Shuting
authors.initials: S
authors.lastname: Dong
authors.forename: Gaoming
authors.initials: G
authors.lastname: Jiang
mesh_terms: D018533:Biomass; D016000:Cluster Analysis; D005308:Fertilizers / Q000009:adverse effects*; D009584:Nitrogen / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D003313:Zea mays / Q000254:growth & development*
chemical_list: D005308:Fertilizers; D012987:Soil; D009584:Nitrogen