Soil Texture Influence on Applied Nitrogen Recovery1
- Ralph G. Nash and
- Donal D. Johnson2
The influence of soil texture on N (nitrogen) recovery from fertilizer NH4+-N or NO3--N by several grass species was determined in the absence of nitrification. Grasses were grown in Terry silty clay soil in which the texture was varied by dilution with sand. The soils were treated with 0, 100, and 200 ppm N and 8 or 24 ppm 2-chloro-6 (trichloromethyl)pyridine, a nitrification inhibitor.
Soil texture had no influence on added N recovery from NO3--N, but increased N amounts were recovered from the finer-textured soils when NH4+-N was the fertilizer source. Nitrogen recovered from the NO3--N (78%) source was greater than from NH4+-N (48%). Lower NH4+-N recoveries were attributed to NH3 volatilization from these calcareous soils. The nitrification inhibitor probably enhanced the loss of N when applied under the conditions used here.
Nitrate N was accounted for in most cases when the increases in soil N were added to that found in the plants. Only 50% of the 100 ppm rate, and 70% of 200 ppm rate of NH4+-N, were accounted for by this method. Recovery efficiency of native soil N was less than that of the fertilizer N.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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