Abstract
Mission silt loam, (coarse-silty, mixed frigid Andic Fragiochrepts) is a forest soil in the Pacific Northwest which has a weathered ash horizon derived from volcanic eruptions in the Cascade Mountain Range. The major production problem for this soil is P fixation due to the weathered volcanic ash. Alternatives to large additions of fertilizer P are considered important in management of this and related soils.
The objective of this work was to study the infuence of organic amendments on soil pH and extractable P in Mission soil. Alfalfa, (Medicago sativa L.) mixed conifer bark or sawdust was added at 4.8% w/w soil as a surface or incorporated treatment.
In incubation experiments, both extractable P and soil pH were significantly increased over time for both surface and incorporated amendments. The majority of P mineralized from surface applied alfalfa remained in the surface 0–2 cm of the soil regardless of incubation period. Conversely, a uniform increase in P occurred throughout the 18 cm soil depth when sawdust was surface applied. The change in extractable P with sawdust addition was equivalent to 61 mg P kg−1 soil as soluble inorganic material.
Soil pH increased rapidly in proximity to surface applied alfalfa while bark and sawdust affected the soil increasingly with time regardless of placement.
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Anderegg, J.C., Naylor, D.V. Phosphorus and pH relationships in an andic soil with surface and incorporated organic amendments. Plant Soil 107, 273–278 (1988). https://doi.org/10.1007/BF02370557
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DOI: https://doi.org/10.1007/BF02370557