柠檬酸对石灰性土壤磷的释放效应

The effect of citric acid on release of phosphorus in calcareous soils

在盆栽条件下,以不施磷肥和不施柠檬酸为对照(CK1),研究了在不施磷和施磷情况下施用柠檬酸对土壤有效磷、小麦地上部和根部吸磷状况以及生物学产量的影响。结果表明,施用柠檬酸明显降低了土壤pH,增加了土壤中的有效磷的含量;在施用磷肥条件下,随着柠檬酸施用量的增加,土壤pH值逐步降低,土壤有效磷逐步提高,小麦地上部,尤其根部吸磷量增加,生物学产量显著增加。

The effects of applying citric acid on the available phosphorus in calcareous soils, the absorption of phosphorus by wheat and biologic output were studied, using no phosphorus fertilizer and no citirc acid as control. The pot experiment showed that applying citric acid could remarkably reduce soil pH, and increased the contents of available phosphorus in calcareous soils; Under the condition of applying phosphorus rertilizer, when the application rate of citric acid was increased, soil pH was lowered, the contents of available phosphorus in calcareous soil was increased, the absorption of phosphorus by shoots and especially by roots were increased, and the biologic output of wheat was increased as well.