Revista Brasileira De Herbicidas 2018; 17(1): 3-11
Mathematical modeling of the drought emergency flow: crop management decision tool
The appearance of weed biotypes resistant to herbicides and the increase in social pressure to reduce its use, created the need to develop tools to refine herbicides application and improve weed control. In this way, the development of weed emergence models has become crucial for the development of management strategies in agricultural areas. The objective of this review is to show the factors that influence the emergence flow and the main models used to predict weed emergence, the procedures of modeling and the practical impacts of their use for weed management. The emergence flow of weeds correlates directly with seed response patterns to the interference of environmental factors and cultural practices. The developed empirical and mechanistic emergence models allow predict weeds emergence in different years and geographic regions, based on climatic and ecophysiological conditions. However, mechanistic models are more complex and allow better comprehension of weed emergence, but empirical models provide the simplicity and the flexibility necessary for decision making. The knowledge of weed emergence flows allow the development of management strategies that provide a greater competitive ability to the crop and reduce productivity losses, as well as the selection of control measures that reduce the use of herbicides, environmental contamination and improve technologies used in agriculture.
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