I would like to know the rate of biochar in combination with organic matter to be applied in agricultural fields for increasing soil fertility.
Dear Elaheh Daghighi . See the following useful RG link: Article The 3R Principles for Applying Biochar to Improve Soil Health
Kindly see also the following useful RG link: Article Effectiveness of Biochar and Compost on Improving Soil Hydro...
Also check please the following useful RG link: https://www.intechopen.com/chapters/72540
The following RG link is also very useful: Article Biochar and/or Compost Applications Improve Soil Properties,...
Visit kindly the following useful RG link: Article Biochar to improve soil fertility. A review
The best venue for biochar is acid infertile soils with soil compaction issues.
The biochar acts as a type of liming agent in those soils addressing acidity and providing essential micronutrients.
Biochar and compost are complementary the larger effect is from compost.
If you put on 15 MT per hectare of good compost and 5 MT of biochar you can renew and invigorate many acid infertile ultisols and oxisols many found in tropical environments.
Rates above those rates get into diminished and negative reactions and are not very economical.
Work on minimum doses with optimum economics are recommended
If you mix 3 parts compost to 1 part biochar and then apply at 0, 5, 10,and 20 MT per hectare you will be able to determine a performance curve for the conditions you are working with. Most of the rates of researchers in the meta analysis were extremely high giving potential of cost and logistics challenges. Dose response curve is what is needed.
Thank you @Paul Reed Hepperly for answering my question in detail. I appreciate hour comments.
@elaheh daghighi
12 Mt per ha which I described would be close to an optimized application would be my estimate
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