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Spatial Distribution Patterns of Johnsongrass (Sorghum halepense) in Corn Fields in Spain

Published online by Cambridge University Press:  20 January 2017

Dionisio Andújar
Affiliation:
Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas, Serrano 115 B, 28006 Madrid, Spain
David Ruiz
Affiliation:
Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas, Serrano 115 B, 28006 Madrid, Spain
Ángela Ribeiro
Affiliation:
Centro de Automática y Robótica, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Madrid, 28500 Arganda del Rey, Madrid, Spain
César Fernández-Quintanilla
Affiliation:
Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas, Serrano 115 B, 28006 Madrid, Spain
José Dorado*
Affiliation:
Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas, Serrano 115 B, 28006 Madrid, Spain
*
Corresponding author's E-mail: jose.dorado@ccma.csic.es

Abstract

This study describes the distribution patterns of Johnsongrass populations present in 38 commercial corn fields located in three major corn growing regions of Spain. A total of 232 ha were visually assessed from the cabin of a combine during harvesting using a three-category ranking (high density, low density, no presence) and recording the georeferenced data in a tablet personal computer. On average, 10.3 and 3.9% of the surveyed area were infested with high and low density of Johnsongrass, respectively. Most of the infested area was concentrated in a few large patches with irregular shape. Small patches (less than 1,000 m2) represented only 27% of the infested area. Management factors could explain much of the spatial distribution of this weed in the studied fields. Tillage direction was the main factor explaining patch shape: the length width−1 ratio of the patches was greater than two in the tillage direction. In sprinkler irrigated fields, higher levels of infestation were generally observed close to the sprinkler lines. Areas close to the edges of the field had a higher risk of infestation than the areas in the middle of the fields: a negative relationship between distance from the edge and weed abundance was established. Because a few patches, located in some predictable parts of the field, such as field edges, represent most of the seriously infested area, site-specific treatments of these areas could reduce herbicide inputs, until more reliable, spatially precise and practical detection, mapping, and spraying systems are developed.

Information

Type
Weed Biology and Ecology
Copyright
Copyright © Weed Science Society of America 

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