Abstract
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 (corn, soybean, and wheat), inorganic nutrients in solution (PO4-P and NO 3-N; PO 4-P and NH 4-N; NO 3-N and NH 4-N; and PO 4-P, NO 3-N, and NH 4-N), solution concentration (0, 6, 12, and 24 μg g -1 residue), and stalk immersion period (25, 250, 2500, 25000, and 86400 s). The initial concentration of each of the P and N constituents in a particular test solution was the same (0, 6, 12 or 24 μg mL -1). Corn-stalk residues released PO 4-P, NO 3-N, and NH 4-N. The quantity of PO 4-P released generally increased as the length of time the corn stalks were immersed became greater. The presence of P and N constituents 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.
Original language | English (US) |
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Pages (from-to) | 429-436 |
Number of pages | 8 |
Journal | Transactions of the ASABE |
Volume | 52 |
Issue number | 2 |
State | Published - Mar 2009 |
Keywords
- Corn
- Crop residue
- Nitrogen movement
- Nutrient losses
- Overland flow
- Phosphorus
- Runoff
- Soybean
- Water quality
- Wheat
ASJC Scopus subject areas
- Forestry
- Food Science
- Biomedical Engineering
- Agronomy and Crop Science
- Soil Science