Fig. 7

Effects of undecomposed and decomposed straw on soil organic matter and soil nutrients sown with 41d. (a) Effects of straw on soil organic matter content. (b) Effects of straw on soil alkaline hydrolyzable nitrogen content. (c) Effects of straw on soil total nitrogen content. (d) Effect of straw on soil available phosphorus content. (e) Effects of straw on soil total phosphorus content. (f) Effects of straw on soil available potassium content. (g) Effects of straw on soil total potassium content. The treatments are the same as Fig. 1. Different letters are significantly different (p < 0.05, Tukey’s HSD test).