![]() ![]() The mapping tool can be zoomed into local stream reaches and also predicts the probability of stream reaches exceeding human health and aquatic life benchmarks. Watershed Regressions for Pesticides (WARP) is an online mapper that predicts the concentrations of 108 pesticides in the U.S. In these situations, statistical models and other types of models are used for predicting water-quality conditions at unmonitored locations under a range of possible circumstances. In addition, many decisions, such as setting monitoring priorities, approving registration of a new pesticide, and determining how much to spend on a management strategy, inherently depend on predicting the potential effects of pesticides on water quality for locations or amounts of use that have never been directly assessed. Predicted Pesticide Concentrations in StreamsĪssessment and management of pesticides require far more information than we can afford to directly measure for all the places, times, and pesticides of interest. Watershed Regressions for Pesticides (WARP) - Atrazine, 2012 The reliability of estimates, however, generally decreases with scale and these maps are not intended for detailed evaluations, such as within or between specific individual counties. These pesticide use estimates are suitable for evaluating national and regional patterns and trends of annual pesticide use. A graph accompanies each map, which shows annual national use by major crop for the mapped pesticide for each year during the period. Maps were created by allocating county-level use estimates to agricultural land within each county. The pesticide-use maps provided on Pesticide National Synthesis Project website show the geographic distribution of estimated pesticide use on agricultural land in the conterminous United States for numerous pesticides. Pesticide concentrations in streams vary widely across the United States and are influenced by many factors, such as the amount and timing of pesticide applications and the soils, climate, and hydrology where they are applied ( Gilliom and others, 2006). Pesticides applied to crops and soil, however, can be transported to surface water and groundwater, where they can degrade water quality. Pesticides are important to crop management because they contribute to increased crop yields and improve the quality of crops. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |