title: [Winter wheat yield gap between field blocks based on comparative performance analysis].
abstract: Based on a two-year household survey data, the yield gap of winter wheat in Quzhou County of Hebei Province, China in 2003-2004 was studied through comparative performance analysis (CPA). The results showed that there was a greater yield gap (from 4.2 to 7.9 t x hm(-2)) between field blocks, with a variation coefficient of 0.14. Through stepwise forward linear multiple regression, it was found that the yield model with 8 selected variables could explain 63% variability of winter wheat yield. Among the variables selected, soil salinity, soil fertility, and irrigation water quality were the most important limiting factors, accounting for 52% of the total yield gap. Crop variety was another important limiting factor, accounting for 14%; while planting date, fertilizer type, disease and pest, and water press accounted for 7%, 14%, 10%, and 3%, respectively. Therefore, besides soil and climate conditions, management practices occupied the majority of yield variability in Quzhou County, suggesting that the yield gap could be reduced significantly through optimum field management.
authors.affiliation: International Research Center of Spatial Ecology, Zhejiang Forestry University, Lin' an 311300, Zhejiang, China. chenjian@126.com
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.forename: Zhong-Yi
authors.initials: ZY
authors.lastname: Wang
authors.forename: Liang-Tao
authors.initials: LT
authors.lastname: Li
authors.forename: Ke-Feng
authors.initials: KF
authors.lastname: Zhang
authors.forename: Zhen-Rong
authors.initials: ZR
authors.lastname: Yu
mesh_terms: D000383:Agriculture / Q000379:methods*; D018533:Biomass; D002681:China; D012044:Regression Analysis; D012621:Seasons; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000254:growth & development*
chemical_list: D012987:Soil