quefts_crop

A number of default crop parameter sets are provided

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_crop function

<dl> <dt>name</dt>
<dd>character. crop name</dd>
 
</dl>

Arguments

Crop parameters — quefts_crop

<dl>

 <dt>name</dt>
<dd>character. crop name</dd>
 
</dl>

	Input Parameters	Explanation
	`_minVeg, _maxVeg, _minStore, _maxStore`	minimum and maximum concentration of "`_`" (N, P, or K) in vegetative organs and in storage organs (kg/kg)
	`Yzero`	the maximum biomass of vegetative organs at zero yield of storage organs (kg/ha)
	`Nfix`	the fraction of a crop's nitrogen uptake supplied by biological fixation

quefts_crop: Crop parameters

Description

Usage

Value

Arguments

Details

Examples