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供试三种磷肥虽其性质不同,但其磷肥利用率和缓效率表现趋势一致。磷肥利用率均随磷肥用量的增高而降低,呈负相关,且随种植年限的延长而减小。磷肥缓效率随磷肥用量的增加而提高,呈正相关。磷肥利用率和缓效率,过磷酸钙的利用率最大,缓效率最小;磷酸二铵磷肥利用率最低,缓效率最高;钙镁磷肥利用率及缓效率均居上述两种磷肥之间,但其P2O5用量小于142.5kghm-2时,利用率大于缓效率,P2O5用量大于285kghm-2时,利用率小于缓效率。由此可知:P2O5含量以水溶性为主要成分的磷酸二铵和P2O5为枸溶性的钙镁磷肥对石灰性土壤均不是理想的磷肥品种。本试验结果提示:石灰性土壤施用磷肥最好的方法是水溶性磷与枸溶性磷合理搭配,其最佳的配合比例应据当地试验结果而定。
Although the three kinds of phosphate fertilizer for its different nature, but its phosphate fertilizer efficiency and slow efficiency of the same trend. Phosphate fertilizer use efficiency decreased with the increase of P application rate, and was negatively correlated with the increase of planting time. The efficiency of phosphate fertilizer slowed down with the increase of the amount of phosphate fertilizer, which was positively correlated. Phosphorus utilization efficiency and slow efficiency, the highest utilization of superphosphate, the slowest efficiency; the lowest phosphate fertilizer DOP, the slowest efficiency; the utilization rate of magnesium and magnesium phosphate and slow efficiency rate between the two kinds of phosphate fertilizer, but the P2O5 When the dosage is less than 142.5kghm-2, the utilization rate is greater than the slow efficiency, and when the P2O5 dosage is more than 285kghm-2, the utilization rate is less than the slow efficiency. It can be seen: P2O5 content as the main component of water-soluble diammonium phosphate and P2O5 citrate-soluble calcium magnesium phosphate for calcareous soil are not ideal for phosphate fertilizer varieties. The results of this experiment suggest that the best method for applying phosphate fertilizer in calcareous soil is that water-soluble phosphorus and citron-soluble phosphorus should be reasonably collocated with each other, and the optimum proportion should be determined according to local test results.