不同吸附载体和剂型的溶磷菌剂改善土壤磷素状况的培养试验

Cultural Experiment of Different Adsorption Carriers and Dosage Forms of Solubilizing Phosphobacteria to Improve Phosphorus Status of Black Soil

为验证不同吸附载体及剂型的溶磷菌剂对土壤磷素状况的改善效果,选择了低磷和高磷两种肥力的土壤进行了室内培养试验。结果表明,对于低磷供试土壤,改善土壤速效磷含量效果较好剂型及配方为:配方4>配方3>液体剂型>配方1>配方2,在土壤培养过程中(30 d、60 d、90 d、120 d),与对照相比土壤速效磷平均含量依次增加11.22 mg/kg、9.43 mg/kg、7.34 mg/kg、4.36 mg/kg和3.38 mg/kg。对于高磷供试土壤,改善高磷土壤速效磷含量效果较好剂型及配方为:配方3>配方1>配方2>配方4,在土壤培养过程中(30 d、60d、90 d、120 d),与对照相比土壤速效磷平均含量依次增加10.37 mg/kg、7.83 mg/kg、3.99 mg/kg和3.08mg/kg,液体剂型的溶磷效果不十分明显。说明对于不同肥力的两种土壤,不同吸附载体配方及剂型的溶磷效果有一定的差异。而且土壤本身的磷素营养状况对于菌剂的溶磷效果也有一定的影响,土壤有效磷的本底值越高菌剂的溶磷效果越不好。

In order to verify the effect of different adsorption carriers and dosage forms of solubilizing phosphobacteria on the improvement of phosphorus status, low and high phosphorus soil were selected in this indoor culture experiments. The results showed that for low phosphorus tested soil, the better dosage forms and formulations to improve the effect of soil available phosphorus content were formulation 4 〉 formulation 3 〉 formulation 2 〉 liquid dosage form 〉 formulation 1 〉 formulation 2. Compared with the control, the average content of soil available phosphorus increased 1 !.22 mg/kg, 9.43 mg/kg, 7.34 mg/kg, 4.36 mg/kg and 3.38 mg/kg in the soil cultivation process of 30 days, 60 days, 90 days, and 120 days. While for high phospho-rus tested soil, the result was formulation 3 〉 formulation 1 〉 formulation 2 〉 formulation 4. Compared with the control, the average content of soil available phosphorus increased 10.37 mg/kg, 7.83 mg/kg, 3.99 mg/kg and 3.08 mg/kg. The effect of the liquid dosage form was not significant. For two soils of different fertility, there were some differences in the effect of dissolved phosphorus among different adsorption carrier formula- tions and dosage forms. And soil phosphorus nutritional status has a certain impact for the dissolved phos-phorus effect of the bacterial agent. The higher soil available phosphorus background value, the worse effect of the dissolved phosphorus.