Figure 4. Impacts of various tillage practices on (a) precipitation storage efficiency (PSE) (b) soil water storage at main crop planting (SWSp), (c) grain yield, (d) evapotranspiration (ET) and (e) water use efficiency (WUE) related to conventional tillage (CT) in spring maize cropping system. The reference line (RR = 0) specifies no variation between conservation tillage and conventional tillage. Data points are the weighted response ratio with 95% confidence intervals. Numbers along bars indicate the sample size.