Effects of four tillage types on saving water and enhancing soil fertility in red soil upland field in Hunan have been studied by field experiment.Results of the trial show that planting on mounds,digging deeply,covering straw and covering plastic film treatments can enhance moisture of soil.But Water saving effect of covering plastic film is the best,covering straw better. These treatments can enhance soil fertility.Compared with contrast,planting on mounds,digging deeply,covering straw and covering plastic film treatments can promot growth of crop,and also enhance output of crop and output v...