Pedosphere 23(2): 229--235, 2013
ISSN 1002-0160/CN 32-1315/P
©2013 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Movement of phosphorus in a calcareous soil as affected by humic acid |
DU Zhen-Yu1 , WANG Qing-Hua1, LIU Fang-Chun1, MA Hai-Lin1, MA Bing-Yao1 and S. S. MALHI2 |
1 Shandong Academy of Forestry, Jinan 250014 (China)
2
Agriculture and Agri-Food Canada, Melfort, Saskatchewan (Canada) |
| ABSTRACT |
| 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. |
| Key Words: acid-extractable P, Luvisol, monocalcium phosphate, P transformation, water-extractable P |
| Citation: Du, Z. Y., Wang, Q. H., Liu, F. C., Ma, H. L., Ma, B. Y. and Malhi, S. S. 2013. Movement of phosphorus in a calcareous soil as affected by humic acid. Pedosphere. 23(2): 229-235. |
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