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Modeling Weed Emergence in Italian Maize Fields

Published online by Cambridge University Press:  20 January 2017

Roberta Masin ,
Donato Loddo ,
Stefano Benvenuti ,
Stefan Otto  and
Giuseppe Zanin
Roberta Masin*
Affiliation:
Dipartimento di Agronomia Ambientale e Produzioni Vegetali, Università di Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
Donato Loddo
Affiliation:
Dipartimento di Agronomia Ambientale e Produzioni Vegetali, Università di Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
Stefano Benvenuti
Affiliation:
Dipartimento di Biologia delle Piante Agrarie, Viale delle Piagge 23, 56100, Pisa, Italy
Stefan Otto
Affiliation:
Istituto di Biologia Agroambientale e Forestale – CNR, Viale dell'Università 16, 35020 Legnaro (PD), Italy
Giuseppe Zanin
Affiliation:
Dipartimento di Agronomia Ambientale e Produzioni Vegetali, Università di Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
*
Corresponding author's E-mail: [email protected]
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Abstract

A hydrothermal time model was developed to simulate field emergence for three weed species in maize (common lambsquarters, johnsongrass, and velvetleaf). Models predicting weed emergence facilitate well-timed and efficient POST weed control strategies (e.g., chemical and mechanical control methods). The model, called AlertInf, was created by monitoring seedling emergence from 2002 to 2008 in field experiments at three sites located in the Veneto region in northeastern Italy. Hydrothermal time was calculated using threshold parameters of temperature and water potential for germination estimated in previous laboratory studies with seeds of populations collected in Veneto. AlertInf was validated with datasets from independent field experiments conducted in Veneto and in Tuscany (west central Italy). Model validation resulted in both sites in efficiency index values ranging from 0.96 to 0.99. AlertInf, based on parameters estimated in a single region, was able to predict the timing of emergence in several sites located at the two extremes of the Italian maize growing area.

Keywords

common lambsquarters, Chenopodium album L.,CHEALjohnsongrass, Sorghum halepense L. Pers, SORHAvelvetleaf, Abutilon theophrasti Medik., ABUTHHydrothermal timeemergence predictionmodelingweed control
Type
Weed Management
Information
Weed Science , Volume 60 , Issue 2 , June 2012 , pp. 254 - 259
Copyright
Copyright © Weed Science Society of America 

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