Journal
SOIL USE AND MANAGEMENT
Volume 27, Issue 1, Pages 110-115Publisher
WILEY
DOI: 10.1111/j.1475-2743.2010.00317.x
Keywords
Biochar; Ultisol; amelioration of soil acidity; soil pH
Categories
Funding
- National Key Technology R&D Program of China [2009BADC6B02]
- National Natural Science Foundation of China [30821140538]
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Biochar was prepared using a low temperature pyrolysis method from nine plant materials including non-leguminous straw from canola, wheat, corn, rice and rice hull and leguminous straw from soybean, peanut, faba bean and mung bean. Soil pH increased during incubation of the soil with all nine biochar samples added at 10 g/kg. The biochar from legume materials resulted in greater increases in soil pH than from non-legume materials. The addition of biochar also increased exchangeable base cations, effective cation exchange capacity, and base saturation, whereas soil exchangeable Al and exchangeable acidity decreased as expected. The liming effects of the biochar samples on soil acidity correlated with alkalinity with a close linear correlation between soil pH and biochar alkalinity (R2 = 0.95). Therefore, biochar alkalinity is a key factor in controlling the liming effect on acid soils. The incorporation of biochar from crop residues, especially from leguminous plants, can both correct soil acidity and improve soil fertility.
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