A system for quantitative evaluation of the fertility of tropical soils (QUEFTS)

A system is described for a quantitative evaluation of the native fertility of tropical soils, using calculated yields of unfertilized maize as a yardstick. The system is applicable to well drained, deep soils, that have a pH(H20) in the range 4.5–7.0, and values for organic carbon, P-Olsen and exchangeable potassium below 70 g/kg, 30 mg/kg and 30 mmol/kg, respectively (0–20 cm). Soil fertility is interpreted as the capacity of a soil to provide plants with nitrogen, phosphorus and potassium, but the methodology allows for including other nutrients.

model Global Crop


Bert Janssen, Mink Zijlstra
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Updated: 2023-07-07
Temporal extent: 2023-07-07

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Updated: 2023-07-07 Edit me on GIT