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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机译：当腐殖酸（HA）和磷（P）肥料同时施用于土壤时，HA可能会影响PA的运动。实验室进行了温育实验，以量化与磷酸一钙（MCP）共同施用的商业HA产品对土壤中PA的影响。在中国北方石灰性土壤中，距磷肥施用地点不同距离的磷运移距离和各种形式的磷浓度单独或组合施用了MCP肥料（相当于26.6 kg P ha-1）将HA（254.8 kg HA ha-1）装在装在圆筒中的土壤表面上（高150 mm，内径50 mm），然后在320 g kg-1的水分含量下孵育7和28 d。柱中每2 mm土层的分析表明，在MCP中添加HA会增加P的移动距离以及土壤中水可萃取P，酸可萃取P和Olsen P的浓度。 P可用incr减少磷的移动距离和磷肥周围土壤中可提取磷的浓度。
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