Relationships of wheat yields between mulching and conventional practices.

(A) The five mulching practices, (B) the three rainfalls during the wheat growing period and (C) the four regions. In the figure, each black point represents one individual comparison result between the yields of wheat for the mulching practices and the control. The points lying on the 1:1 line indicate that the yield of wheat responded similarly to the mulching practices and the control, whereas the points distributed above or below the line indicate a positive or negative effect of the mulching practices on the yield of wheat, respectively. FM: flat mulching; RFM: ridge–furrow mulching; WSM: wheat straw mulching; MTMC: mulching with two materials combined; MOM: mulching with other materials.