Figure 6

Leaf area index at the jointing (a), heading (b), and filling (c) stages in 2013–2014 and 2014–2015 winter wheat growing seasons. WN represent wide-precision planting with non-mulching, CN represent conventional-cultivation planting with non-mulching, WM represent wide-precision planting with straw mulching, and CM represent conventional-cultivation planting with straw mulching, respectively. Vertical bars are standard errors.