Comparison of soil tests with plant response to nutrients in selected soils of Vanuatu
Soils from seven sites in Vanuatu were evaluated by nutrient omission pot trials to identify deficiencies of plant-available nutrients. Results from these trials were compared with relevant soil test results, namely nitrate nitrogen, available phosphorus (NaHCO3 and H2SO4 extractants), exchangeable potassium and extractable sulfur. Except for sulfur and H2SO4-extractable P, the correlations between soil test value and plant response were poor, and all soil tests incorrectly assigned at least one of the seven soils to the "deficient" or "adequate" categories. In the case of sulfur, increasing the critical value to about 20 mg/kg would have improved the predictive power of the test.
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| Main Authors: | , , , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
Regional Institute
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| Subjects: | F60 - Physiologie et biochimie végétale, P33 - Chimie et physique du sol, propriété physicochimique du sol, réponse de la plante, http://aims.fao.org/aos/agrovoc/c_7182, http://aims.fao.org/aos/agrovoc/c_25446, http://aims.fao.org/aos/agrovoc/c_5159, |
| Online Access: | http://agritrop.cirad.fr/525361/ |
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