quefts_soil

An implementation of the QUEFTS (Quantitative Evaluation of the Native Fertility of Tropical Soils) model. The model (1) estimates native nutrient (N, P, K) supply of soils from a few soil chemical properties; and (2) computes crop yield given that supply, crop parameters, fertilizer application, and crop attainable yield. See Janssen et al. (1990) <doi:10.1016/0016-7061(90)90021-Z> for the technical details and Sattari et al. (2014) <doi:10.1016/j.fcr.2013.12.005> for a recent evaluation and improvements.

Robert Hijmans

Rquefts

Quantitative Evaluation of the Native Fertility of Tropical
Soils

Robert J. Hijmans

Pieter Pypers

Joost Wolff

quefts_soil function

soil parameters — quefts_soil

soil parameters

	Input Parameters	Explanation
	`N_base_supply, P_base_supply, K_base_supply`	Potential supply (kg/ha) of N, P and K of the (unfertilized) soil in a growing season of standard length (default is 120 days). See `nutSupply2` to estimate that.
	`N_recovery, P_recovery, K_recovery`	Fertilizer recovery, that is, the fraction of applied fertilizer that can be taken up by the plant.
	`UptakeAdjust`	Two-column matrix to compute the fraction uptake from soil supply as function of length of season. The default standard season length is 120 days. The first column is the length of the growing season, the second column is the fraction uptake. Intermediate values are computed by linear interpolation.

Last chance! 50% off unlimited learning

quefts_soil: soil parameters

Description

Usage

Arguments

Value

Details

Examples