QUEFTSQuantitative Evaluation of the Fertility of Tropical Soils
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The NE for rice is a nutrient decision support tool developed by the IPNI China Program based on the modified QUEFTS model which simulated optimal nutrient uptake, and uses site-specific nutrient management principles that combine the 4R fertiliser strategy (right source, right rate, right time, and right place).
Two statistical formulae of root mean square error (RMSE) and normalised-RMSE (n-RMSE) were used to evaluate the QUEFTS model and the deviation between the measured and simulated data.