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Modeling seedling johnsongrass (Sorghum halepense) emergence as influenced by temperature and burial depth

Published online by Cambridge University Press:  12 June 2017

Eric P. Prostko ,
Hsini-I Wu  and
J. Michael Chandler
Hsini-I Wu
Affiliation:
Department of Biological/Industrial Engineering, Texas A&M University, College Station, TX 77843-3131
J. Michael Chandler
Affiliation:
Department of Soil & Crop Sciences, Texas A&M University, College Station, TX 77843-2474
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Abstract

Research was conducted to formulate a seedling johnsongrass emergence model as influenced by temperature and burial depth using the poikilotherm rate equation. A series of constant-temperature growth chamber experiments with johnsongrass seed buried at various depths in fritted clay was conducted to develop a temperature/burial emergence database. The poikilotherm rate equation was fit to the emergence data from burial depths of 0 to 2.5 cm at constant temperatures between 20 and 44 C. These data were then combined to formulate a single poikilotherm rate equation to model the emergence of seedling johnsongrass from 0 and 2.5 cm deep and 20 to 44 C. This combined model was validated against two independent emergence data sets with good results.

Keywords

Johnsongrass, Sorghum halepense (L.) Pers. SORHAMechanistic modelpoikilotherm rate equation
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 5 , October 1998 , pp. 549 - 554
Copyright
Copyright © 1998 by the Weed Science Society of America 

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