Rice Herbicide Evaluation in Texas Gulf Coastby Eugene R. Lindemann, USDA, Temple, United States,
Abstract: The Texas rice belt, bordered on the south and east by the Gulf of Mexico, extends about 113 km (70 mile) inland and parallels the coastline for approximately 322 km (200 mile) from Victoria, Texas to Orange, Texas. The large volume of water used for rice production eventually drains into the bay and estuary system along the Texas gulf coast. Rice fields irrigation return flows have the potential of being loaded with nutrients and pesticides that could adversely affect the fragile estuarine environment. This 1990 - 1991 research work monitored the herbicide molinate used in 2 fields in Colorado and Wharton Counties. Some 322 soil samples and 1,247 water samples collected during the growing seasons were analyzed and evaluated for th fate of molinate. Retention times exceeding about 28 days indicated molinate degraded to non- detectable levels or below the minimum estimated detection limit in both irrigation return flows and in the soil.
Subject Headings: Pesticides | Crops | Gulfs | Soil pollution | Coastal environment | Water pollution | Soil water | Sea water | Estuaries | North America | United States | Texas | Australia | Gulf of Mexico | Colorado | Victoria
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