Adsorption and Desorption of Phosphorus and Nitrogen by Immersed Stalks

J. E. Gilley, B. Eghball, D. B. Marx
2009 American Society of Agricultural and Biological Engineers. Transactions  
Adsorption and desorption of phosphorus (P) and nitrogen (N) by stalk residues may influence the concentrations of P and N in runoff. A laboratory study was conducted to measure the effects of P and N constituents in solution on adsorption and desorption of P and N by corn, soybean, and wheat stalk residues. Experimental variables included type of stalk material (released generally increased as the length of time the corn stalks were immersed became greater. The presence of P and N constituents
more » ... in solution in general did not affect the quantity of NO 3 -N released by corn-stalk residues. Soybean-stalk residues released PO 4 -P and adsorbed relatively small amounts of NH 4 -N. Wheat-stalk residues released PO 4 -P, and adsorbed NO 3 -N and NH 4 -N. The presence of stalk residues, P or N solution concentration, and residue immersion period may influence P and N concentrations of overland flow. The amount of P and N adsorbed or desorbed by residue materials can be significantly different if more than one nutrient constituent is present in solution.
doi:10.13031/2013.26836 fatcat:todd2zjhwzgaxo37ozxxd6bfaa