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Titre du document / Document title

Simulating forage sorghum yields with SORKAM

Auteur(s) / Author(s)

FRITZ J. O. (1) ; VANDERLIP R. L. (1) ; HEINIGER R. W. (2) ; ABELHALIM A. Z. (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Agronomy Dep., Kansas State Univ., Manhattan, KS 66506, ETATS-UNIS
(2) Vernon James Res. & Ext. Ctr., Plymouth, NC 27962, ETATS-UNIS
(3) Agric. Res. Ctr., Giza, EGYPTE

Résumé / Abstract

A validated crop model can be a valuable tool for evaluating new production and management practices, particularly for crops routinely grown in environments that produce large variation in field performance tests. Previous work has been done to validate SORKAM a crop growth model for grain sorghum [Sorghum bicolor (L.) Moench]. The purpose of this study was to determine the ability of SORKAM to simulate forage sorghum yields for a wide range of environmental conditions. Data for the simulations used in the validation process were taken from performance tests for four cultivars ('Early Sumac', 'Atlas', 'Sugar Drip', and 'Canex') conducted at two sites in Kansas over 25 yr. Simulated bloom date, grain, stover, and total dry matter yields were regressed on measured data. The SORKAM model simulated bloom dates without bias; however, the root mean square error (RMSE) was 8 d, and the model tended to overestimate bloom date under conditions of water deficit. The model generally overpredicted yields of the four cultivars for grain (bias = 3.2 Mg ha-1), stover (bias = 2.0 Mg ha-1), and total dry matter (bias = 5.2 Mg ha-1). In addition to overestimation of total dry matter production, weaknesses in the SORKAM model in simulating forage sorghum growth included inability to simulate phenological development accurately under moisture deficit stress and to partition dry matter into grain and stover. These problems must be resolved before SORKAM can be used to address management decisions.

Revue / Journal Title

Agronomy journal    ISSN  0002-1962   CODEN AGJOAT 

Source / Source

1997, vol. 89, no1, pp. 64-68 (38 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Society of Agronomy, Madison, WI, ETATS-UNIS  (1949) (Revue)

Mots-clés anglais / English Keywords

Model matching

;

Environmental effect

;

Simulation model

;

Yield

;

Numerical simulation

;

Validation

;

Cultivar

;

Sorghum bicolor

;

Fodder

;

Dry matter

;

Kansas

;

Field experiment

;

Variety trial

;

Gramineae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

United States

;

North America

;

America

;

Biometrics

;

Modeling

;

Fodder crop

;

Mots-clés français / French Keywords

Ajustement modèle

;

Effet environnement

;

Modèle simulation

;

Rendement

;

Simulation numérique

;

Validation

;

Cultivar

;

Sorghum bicolor

;

Fourrage

;

Matière sèche

;

Kansas

;

Essai en champ

;

Essai variétal

;

Gramineae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Etats Unis

;

Amérique du Nord

;

Amérique

;

Biométrie

;

Modélisation

;

Plante fourragère

;

Mots-clés espagnols / Spanish Keywords

Ajustamiento modelo

;

Efecto medio ambiente

;

Modelo simulación

;

Rendimiento

;

Simulación numérica

;

Validación

;

Cultivar

;

Sorghum bicolor

;

Forraje

;

Materia seca

;

Kansas

;

Ensayo en campo

;

Ensayo varietal

;

Gramineae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Estados Unidos

;

America del norte

;

America

;

Biometría

;

Modelización

;

Planta forrajera

;

Localisation / Location

INIST-CNRS, Cote INIST : 553, 35400006357942.0100

Nº notice refdoc (ud4) : 2638666



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