[Winter wheat yield gap between field blocks based on comparative performance analysis].
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.
Chen
Jian
J
International Research Center of Spatial Ecology, Zhejiang Forestry University, Lin' an 311300, Zhejiang, China. chenjian@126.com
Wang
Zhong-Yi
ZY
Li
Liang-Tao
LT
Zhang
Ke-Feng
KF
Yu
Zhen-Rong
ZR
D000383:Agriculture / Q000379:methods*; D018533:Biomass; D002681:China; D012044:Regression Analysis; D012621:Seasons; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000254:growth & development*
D012987:Soil