fertilizers

nutrientRates

Computes the amount of nutrients given a rate of fertilizer.

Fertilizers

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

Fertilizers function

<dl> <dt>supply</dt>
<dd>data.frame with columns "N", "P", "K" expressed as percentage of the product (row)</dd> <dt>treatment</dt>
<dd>amounts applied</dd></dl>

Arguments

Helper functions to go from fertilizers to nutrients — Fertilizers

<dl>

 <dt>supply</dt>
<dd>data.frame with columns "N", "P", "K" expressed as percentage of the product (row)</dd>

 <dt>treatment</dt>
<dd>amounts applied</dd>

</dl>

Fertilizers: Helper functions to go from fertilizers to nutrients

Description

Usage

Arguments

Examples