Publications des agents du Cirad


Comparison of soil tests with plant response to nutrients in selected soils of Vanuatu

Melteras M., O'Sullivan J., Asher C., Lebot V.. 2004. In : Turner Neil (ed.), Angus John (ed.), Mc Intyre Lynne (ed.), Robertson Michael (ed.), Borrell Andrew (ed.), Lloyd David (ed.). New directions for a diverse planet : Proceedings for the 4th International Crop Science Congress, Brisbane, Australia, 26 Sep - 1 Oct 2004. Gosford : Regional Institute. International Crop Science Congress. 4, 2004-09-26/2004-10-01, Brisbane (Australie).

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.

Mots-clés : propriété physicochimique du sol; réponse de la plante; vanuatu

Communication de congrès

Agents Cirad, auteurs de cette publication :