腐植酸对土壤中无机磷活化效应的研究

通过磷的吸附—解吸试验,大豆盆栽和大田试验,研究了在石灰性土壤上施用风化煤、泥炭、膨润土对土壤中不同形态无机磷的影响和生物效应。试验结果表明:施用风化煤、泥炭对磷的活化作用比较明显,而膨润土的效果相对较弱;在与磷肥配合中也是风化煤、泥炭的效果最好,膨润土的效果略差。在单施风化煤、泥炭的处理中,土壤中对植物有效性较高的Ca2-P等都有增加,而植物难利用的Ca10-P则降低了,施泥炭的土壤中有效磷增量比较明显;施磷处理中,泥炭加磷肥比其他处理高,而风化煤、膨润土的效应比泥炭略差。就各指标进行综合评价,3种材料活化磷的效果依次是:风化煤>泥炭>膨润土。

Study on humic acid activation of inorganic phosphorus in soil

The impact and biological effect of weathered coal, peat, bentonite on different type inorganic phosphorus in the lime soil was studied by the test of sorption-desorption of phosphorus and soybean grown in pots and field. The results showed that the active effect of weathering coal and peat on phfosphorus is significant, while the effect of bentonite is relatively weak. When applied weathered coal and peat, Ca 2 -P content, which is more effective to crops, was increased, but Ca 10 -P content, which is difficult to be absorbed, decreased. The application of peat increased soil available phosphorus content clearly. The availability of peat with phosphorus is greater than that of weathered coal and bentonite. After comprehensive evaluation on every index, the result of activating phosphorus of the three martials is: weathering coal>peat>bentonite.