Sensitivity of Soil P Availability Tests to Ca-P in Oxisols
| Autor: | Jefferson Luiz de Aguiar Paes, V Victor Hugo Alvarez, Wedisson Oliveira Santos, Samuel Vasconcelos Valadares, Caio Buainain Lins, Roberto Ferreira Novais |
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| Rok vydání: | 2017 |
| Předmět: |
Soil test
Chemistry Phosphorus Soil Science chemistry.chemical_element 04 agricultural and veterinary sciences 010501 environmental sciences Phosphate 01 natural sciences Zea mays chemistry.chemical_compound Animal science Agronomy Oxisol 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Dry matter Agronomy and Crop Science 0105 earth and related environmental sciences |
| Zdroj: | Communications in Soil Science and Plant Analysis. 48:1834-1842 |
| ISSN: | 1532-2416 0010-3624 |
| Popis: | We assessed the sensitivity of mixed exchange resin (MER) and Mehlich-3 (M3) to calcium-bound phosphate (Ca-P) in Oxisols. These methods were compared with Mehlich-1 (M1) and anion exchange resin (AER), which have high and low sensitivity, respectively, to this soil P form. We used maize (Zea mays L.) as a test plant. Three samples from two Oxisols were treated with five ratios of Triple Superphosphate—TS and Bayovar Phosphate Rock—BPR (0 + 100; 25 + 75, 50 + 50, 75 + 25 and 100 + 0% TS + BPR). The MER extracted more P than AER and M3 at the highest BPR:TS ratios (high Ca-P) and similar quantities at the higher TS:BPR ratios (low Ca-P) for two soil samples. Unlike M1-extracted P, M3-P, AER-P, and MER-P positively correlated with maize dry matter production and P uptake. Mehlich-3 and MER were suitable to assess P availability in high Ca-P Oxisols. |
| Databáze: | OpenAIRE |
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