Addition of lignin to lime materials for expedited pH increase and improved vertical mobility of lime in no‐till soils

Soil acidification caused by long‐term nitrogen (N) fertilizer applications has been a growing concern for dryland crop production in both tilled and no‐till soils in the Pacific Northwest (PNW). Many no‐till soils have stratified soil pH in the 5–10 cm depth due to repeated N fertilizer application...

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Bibliographic Details
Published in:Soil use and management 2019-06, Vol.35 (2), p.314-322
Main Authors: Tao, Haiying, Pan, William L., Carter, Paul, Wang, Ku, Aitkenhead, Matt
Format: Article
Language:English
Subjects:
Acidic soils
Acidification
Acidity
Agricultural production
Alkalies
Black liquor
Crop production
Depth
Fertilizer application
Fertilizers
Incubation period
Lignin
Lime
Liming
Liquor
Nitrogen
no‐till
pH effects
Pulp wastes
Soil
Soil acidification
soil acidity
Soil chemistry
Soil investigations
Soil lime
Soil pH
tillage
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Summary:Soil acidification caused by long‐term nitrogen (N) fertilizer applications has been a growing concern for dryland crop production in both tilled and no‐till soils in the Pacific Northwest (PNW). Many no‐till soils have stratified soil pH in the 5–10 cm depth due to repeated N fertilizer applications at this depth. In the PNW, the practice of liming to correct low soil pH is complicated due to lack of affordable lime sources and because the inherent difficulty in ameliorating stratified soil acidity in no‐till systems. An intact soil‐column incubation study was conducted to investigate whether mixing lime materials with lignin‐containing black liquor—a by‐product from the pulp industry—could elevate soil pH change in both conventional and no‐till systems and expedite vertical downward movement of lime in no‐till system. Results indicate that mixing lime with black liquor has the potential to not only elevate the increase in soil pH in both conventional till and no‐till systems, but also accelerate downward movement of lime to correct soil pH below the soil surface. Mixing agricultural lime or super fine micro lime with black liquor increased soil pH to a depth of 25–30 cm within 147 days after surface application to a no‐till soil.
ISSN:0266-0032
1475-2743
DOI:10.1111/sum.12483