Document Type : Articles
Authors
- Hudhaifa AL-Hamandi 1
- Yasir Hmood AL Janabi 1
- Ahmed Maath Ahmed 1
- Mijbil Mohammad Aljumaily 1
- Mohammed Ali Al-Obaidi 2
1 Tikrit University,College of Agriculture ,Department of Soils and Water Resources
2 Department of Soil Science and Water Rescores, College of Agriculture and Forestry, Mosul University, Nineveh, Iraq
Abstract
The application of biochar has aroused great interest. Still, our understanding of the behavior of biochar with soil properties and its relationship with potassium forms on soil health in gypsum soils is limited. Biochar is a carbon-rich product that is used as a means to improve soil properties. Twelve soil samples have been collected from some gypsiferous soils in Iraq to determine the different forms of potassium and their relation with clay mineralogy and other soil properties. Collect soil samples were put in small plastic pots and adding biochar at a rate of 5 gm. Kg-1 for each soil to evaluate the effect of biochar on potassium forms. The X-ray diffraction showed that smectite was the dominant mineral in the studied soils followed by Illite, Kaolinite, Palygoriskite and Chlorite clay fractions. Results showed that biochar application improved all potassium forms and soil chemical characteristics. Biochar addition increased all potassium forms, from (0.011-0.041) to (0.031-0.075) (Cmolec Kg-1), from (0.05-0.19) to (0.08-0.22) (Cmolec Kg-1) and from (0.15-0. 41) to (0.25-0.61) (Cmolec Kg-1) for soluble, exchangeable and non-exchangeable potassium before and after adding biochar respectively. Whereas increased soil cation exchange capacity from (4.8-11) to (9.8-18) Cmolckg-1 and organic matter from (3.5-13) to (7.9-19) gm. Kg-1. It was found that the correlation coefficient between potassium forms for all soils after adding biochar was high and positive except for the pH.
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