Effects on the soil aggregate stability rate with different straw incorporation treatments (%).

Note: CK, no straw incorporation; L, incorporation of straw at a low rate of 4 500 kg ha−1 maize straw; M, incorporation of straw at a medium rate of 9 000 kg ha−1 maize straw; H, incorporation of straw at a high rate of 13 500 kg ha−1 maize straw; AVG, the mean value of the 0–40 cm soil layers.
1Values followed by the same lowercase letter in the same line are not significantly different according to Duncan’s multiple range test (P<0.05) between the four straw incorporation treatments in the same year.
2Values followed by the same uppercase letter in the same line are not significantly different according to Duncan’s multiple range test (P<0.05) between the different years of the same straw incorporation treatment.
3Means ± standard deviations.