Journal
PEDOSPHERE
Volume 23, Issue 2, Pages 229-235Publisher
SCIENCE PRESS
DOI: 10.1016/S1002-0160(13)60011-9
Keywords
acid-extractable P; Luvisol; monocalcium phosphate; P transformation; water-extractable P
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Funding
- Shandong Provincial Doctoral Foundation of China [2007B508013, BS2012NY011]
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When humic acid (HA) and phosphorus (P) fertilizer are simultaneously applied to soil, HA may affect the movement of P. A laboratory incubation experiment was conducted to quantify the effects of a commercial HA product co-applied with monocalcium phosphate (MCP) on the distance of P movement and the concentration of P in various forms at different distances from the P fertilizer application site in a calcareous soil from northern China. Fertilizer MCP (at a rate equivalent to 26.6 kg P ha(-1)) was applied alone or in combination with HA (at 254.8 kg HA ha(-1)) to the surface of soil packed in cylinders (150 mm high and 50 mm internal diameter), and then incubated at 320 g kg(-1) moisture content for 7 and 28 d periods. Extraction and analysis of each 2 mm soil layer in columns showed that the addition of HA to MCP increased the distance of P movement and the concentrations of water-extractable P, acid-extractable P and Olsen P in soil. The addition of HA to MCP could enhance P availability by increasing the distance of P movement and the concentration of extractable P in soil surrounding the P fertilizer.
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