How are effective methods to fill up biochar in soil: 1)on surface; 2) in 0-10 cm; 3)in 0-20 cm 4)other for different cultures plants (cereal, maize, soybean, potato) and vegetables?
Plants are need C-organic 12-20% for growth up normally. So, how many biochar which fill up to soil can be use this form. Total biochar = (12% * soil dry weight of root around) - total soils C-org content. Just its. Im sorry if not help
see this paper https://www.ets.org/s/careers/pdf/toefl-ibt-wr17-sob.pdf
My dear please check the following link it will be very useful for you
http://www.biochar-international.org/sites/default/files/IBI_Biochar_Application.pdf
Biochar addition below the top 10 cm could promote root growth at depth
http://mro.massey.ac.nz/bitstream/handle/10179/7180/01_front.pdf?sequence=1
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