Availability of potassium as affected by biogas residue reasonable application
YANG Chun-lu1,3, LIANG Cheng-hua2, SUN Tie-hang1, CHEN Xin-zhi2, XUE Zhao2
1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016; 2. Department of Soil and Environment, Shenyang Agriculture University, Shenyang 110161; 3. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
The availability of potassium and K-fixation as affected by application of biogas residue on farming brown soil & meadow soil has been investigated with wetting-drying incubation experiments. Results indicate that after biogas residue application, (1) potassium releasing from soil can be evidently promoted. Decrease of amount of fast available K can be made with air-drying process when it is higher than 99.24 mg·kg-1 in brown soil control, and 83.23 mg·kg-1 in meadow soil control. Interbedded K will be released if only fast available K is lower than 130.53 mg·kg-1 in brown soil, and 139.29 mg·kg-1 in meadow soil with 6% biogas residue addition. (2)K-fixation of extra-K can be efficiently reduced. The capacity of K-fixation is respectively decreased 12.51 and 54.81 mg·kg-1 on brown soil & 62.57 and 137.66 mg·kg-1 on meadow soil with 2% and 6% biogas residue application after 15 days wetting-drying incubation.
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