Comparison of Soil Phosphorus Tests for Assessing Plant Availability of Phosphorus in an Ultisol Amended with Water-Soluble and Phosphate Rock Sources
This work reports on soil phosphorus (P) test calibrations in triple superphosphate (TSP)– and phosphate rock (PR)–fertilized soils for cost-effective fertilizer recommendations. Results showed that separate calibrations are required for TSP and PR fertilizers for conventional soil tests. Use of cri...
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Main Authors: | , , , |
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Format: | Article |
Language: | English English |
Published: |
2010
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Online Access: | http://psasir.upm.edu.my/id/eprint/11708/1/Comparison%20of%20Soil%20Phosphorus%20Tests%20for%20Assessing%20Plant%20Availability%20of%20Phosphorus%20in%20an%20Ultisol%20Amended%20with%20Water.pdf http://psasir.upm.edu.my/id/eprint/11708/ |
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Summary: | This work reports on soil phosphorus (P) test calibrations in triple superphosphate (TSP)– and phosphate rock (PR)–fertilized soils for cost-effective fertilizer recommendations. Results showed that separate calibrations are required for TSP and PR fertilizers for conventional soil tests. Use of critical P levels (CPLs) established for TSP in PR recommendations leads to erroneous application of PR while it incurs unnecessary application costs. The iron oxide–impregnated paper was insensitive to P sources and would be the most appropriate soil test in integrated nutrient systems |
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