Tuesday, 8 November 2005
7

Nutrient Status of Texas Agricultural and Urban Soils.

Tony Provin, Mark McFarland, John Pitt, and Jeff S. Waskom. Texas A&M University, 343 Heep Center Tamu 2474, College Station, TX 77843-2474

Considerable attention has been focused on the nutrient status of agricultural soils, particularly on or near confined animal feeding operations (CAFOs) and nutrient impaired watersheds. A number of nutrient impaired watersheds serve as drinking water sources for municipalities, feed wildlife and recreational areas or are derived of mixed agricultural, urban or industrial uses. Most CAFOs in Texas are under regulatory mandate to have a nutrient management plan and an operational permit. These plans and permits often require annual soil testing, manure, litter and effluent testing, and extensive record keeping of all enterprise activities. While extensive state and Federal legislation attention has been directed toward CAFOs, other agricultural enterprises and the urban sector are largely unaffected by regulations. The Texas Cooperative Extension Soil, Water and Forage Testing Laboratory routinely captures soil testing data from urban and agricultural samples. These data indicate a significantly higher percentage of urban samples, than agricultural samples, test high, very high or excessive for phosphorus and nitrate-nitrogen. Changes over time of nitrate-nitrogen in agricultural and non-agricultural (urban) soils will be presented. Additionally, comparison of non-agricultural soil testing data between metropolitan and non-metropolitan samples will be discussed.

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