Phosphorus forms in soil amended with meat and bone meal ash and dried distillers grain ash
Date
2012-03-13
Authors
Alotaibi, K.D.
Schoenau, J.J.
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Abstract
Biogas production from organic materials via gasification process also generates a valuable
byproduct of ash. Ash contains the original nutrient present in organic materials, except carbon,
nitrogen and sulfur that are lost as gases during this process. Therefore, the ash is concentrated in
the important macronutrient of phosphorus and potassium. If this ash is land-applied, ash
phosphorus may reside in soil in different forms. Therefore, to determine the feasibility of land
application of ash in providing phosphorus for crops, a study was carried out using Brown
Chernozemic soil in growth chamber. Specifically, this study aimed to investigate the influence
of two ashes applied at three rates of P in comparison with mineral P fertilizer on P species that
resided in soil after harvest using a sequential extraction procedure. Plant phosphorus recovery
was also investigated. The experimental treatments for the growth chamber study included 3 P
sources: dried distillers grain ash (DDGA), meat & bone meal ash (MBMA) and mono-calcium
phosphate fertilizer (MP). Each P source was applied at 3 rates: 25, 50 and 100 kg P ha-1 in
addition to a control. Each treatment was supplemented with 200 kg urea-N ha-1 to ensure that N
is not a limiting factor. Analysis of ashes co-produced from gasification of distillers grain and
meat & bone meal showed that they are rich in phosphorus, ranging from 18 – 19 % P. A high
proportion of residual P from the meat & bone meal ash was present in the form of calcium
phosphate in the soil. The most labile forms of P was higher in DDGA treatments compared to
MBMA. Phosphorus recovery in DDGA treatments was similar to that of MP treatments, and
greater than MBMA.
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Soils and Crops Workshop