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| 石灰性土壤上三种磷肥不同用量的磷肥利用率及其缓效率 | |
| 作者单位： | 中国农业科学院资源区划所 |
| 摘 要： | 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。 |
| 关 键 词： | 石灰性潮土 磷肥 磷肥利用率 磷肥缓效率 |
The Use Efficiency and Slow-Release Rate of Various P Fertilizers with Different Application Rates on Calcareous Soil |
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| Authors: | WANGShao-ren XIAPei-zhen |
| Abstract: | Although the 3 tested P fertilizers had different features, they had similar trend in use efficiency and slow-release rate. Their use efficiency decreased with increasing application rate, as well as with increasing cropping period. The slow-release rate |
| Keywords: | Calcareous soil Phosphate fertilizer Use efficiency of phosphate fertilizer Slow-release rate of phosphate fertilizer |
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