Estimating the Spatial Distribution of Groundwater Demand In the Texas High Plains

Developing groundwater management plans requires a good understanding of the interdependence of groundwater hydrology and producer water use behavior. While state-of-the-art groundwater models require water demand data at highly disaggregated levels, the lack of producer water use data has held up the progress to meet that need. This paper proposes an econometric framework that links county-level crop acreage data to well-level hydrologic data to produce heterogeneous patterns of crop choice and irrigation practices within a county. Together with agronomic data on irrigation water requirements of various crops and irrigation practices, this model permits estimation of the water demand distribution within a county. We apply this model to a panel of 16 counties in the Southern Texas High Plains from 1972 to 2000. The results obtained not only are consistent with those from the traditional multinomial logit land use model, but also indicate the presence of large intra- and inter-county heterogeneity in producer water use behavior.Discrete Choice Model, Random-coefficients Discrete Choice Model, Crop Choice, BLP, Groundwater, Texas High Plains, Ogallala Aquifer, Crop Production/Industries, Resource /Energy Economics and Policy,

Proceedings of the 24th annual Central Plains irrigation conference

Presented at Proceedings of the 24th annual Central Plains irrigation conference held on February 21-22 in Colby, Kansas.Includes bibliographical references

Unerwartete Abbrüche von Pflegeverhältnissen im Kinder- und Jugendalter

A field planting system for use in conjunction with large span and wheel tower irrigation apparatus to place seed in a field across a number of rows simultaneously. Seed is suspended uniformly in a gel solution and injected into a stream of carrier water. The seeds, suspended in water, travel in piping separate from irrigation piping to a manifold suspended from the overhead span section. Each manifold distributes seed and carrier water to a plurality of drop tubes. A tube valve located in each drop tube is closed to permit the manifold to be charged with seeds and water under pressure. Once the manifold is charged, the tube valves open simultaneously and the water and seed discharges from the manifold through drop tubes to a planting shoe. The planting shoe includes a forward nozzle to emit a high pressure stream of water to excavate a small trench or furrow into which the seed is dispensed. A perforated metal tube angling rearwardly from the drop tube dissipates the energy of the carrier water to assure that the seed is not washed from the trench. A trench closer trails the planting shoe to push some of the dislodged soil over the seed and cover the furrow.U

Row crop planting apparatus for mobile pipe span-and-tower irrigation systems

A field planting system for use in conjunction with large span and wheel tower irrigation apparatus to place seed in a field across a number of rows simultaneously. Seed is suspended uniformly in a gel solution and injected into a stream of carrier water. The seeds, suspended in water, travel in piping separate from irrigation piping to a manifold suspended from the overhead span section. Each manifold distributes seed and carrier water to a plurality of drop tubes. A tube valve locate in each drop tube is closed to permit the manifold to be charged with seeds and water under pressure. Once the manifold is charged, the tube valves open simultaneously and the water and seed discharges from the manifold through drop tubes to a planting shoe. The planting shoe includes a forward nozzle to emit a high pressure stream of water to excavate a small trench or furrow into which the seed is dispensed. A perforated metal tube angling rearwardly from the drop tube dissipates the energy of the carrier water to assure that the seed is not washed from the trench. A trench closer trails the planting shoe to push some of the dislodged soil over the seed and cover the furrow.U

Row crop planting apparatus for mobile pipe span-and-tower irrigation systems

A field planting system for use in conjunction with large span and wheel tower irrigation apparatus to place seed in a field across a number of rows simultaneously. Seed is suspended uniformly in a gel solution and injected into a stream of carrier water. The seeds, suspended in water, travel in piping separate from irrigation piping to a manifold suspended from the overhead span section. Each manifold distributes seed and carrier water to a plurality of drop tubes. A tube valve locate in each drop tube is closed to permit the manifold to be charged with seeds and water under pressure. Once the manifold is charged, the tube valves open simultaneously and the water and seed discharges from the manifold through drop tubes to a planting shoe. The planting shoe includes a forward nozzle to emit a high pressure stream of water to excavate a small trench or furrow into which the seed is dispensed. A perforated metal tube angling rearwardly from the drop tube dissipates the energy of the carrier water to assure that the seed is not washed from the trench. A trench closer trails the planting shoe to push some of the dislodged soil over the seed and cover the furrow.U

Distribution manifold for mobile span-and-tower irrigation systems

A field planting system for use in conjunction with large span and wheel tower irrigation apparatus to place seed in a field across a number of rows simultaneously. Seed is suspended uniformly in a gel solution and injected into a stream of carrier water. The seeds, suspended in water, travel in piping separate from irrigation piping to a manifold suspended from the overhead span section. Each manifold distributes seed and carrier water to a plurality of drop tubes. A tube valve located in each drop tube is closed to permit the manifold to be charged with seeds and water under pressure. Once the manifold is charged, the tube valves open simultaneously and the water and seed discharges from the manifold through drop tubes to a planting shoe. The planting shoe includes a forward nozzle to emit a high pressure stream of water to excavate a small trench or furrow into which the seed is dispensed. A perforated metal tube angling rearwardly from the drop tube dissipates the energy of the carrier water to assure that the seed is not washed from the trench. A trench closer trails the planting shoe to push some of the dislodged soil over the seed and cover the furrow.U

Row crop planting apparatus for mobile pipe span-and-tower irrigation systems

A field planting system for use in conjunction with large span and wheel tower irrigation apparatus to place seed in a field across a number of rows simultaneously. Seed is suspended uniformly in a gel solution and injected into a stream of carrier water. The seeds, suspended in water, travel in piping separate from irrigation piping to a manifold suspended from the overhead span section. Each manifold distributes seed and carrier water to a plurality of drop tubes. A tube valve locate in each drop tube is closed to permit the manifold to be charged with seeds and water under pressure. Once the manifold is charged, the tube valves open simultaneously and the water and seed discharges from the manifold through drop tubes to a planting shoe. The planting shoe includes a forward nozzle to emit a high pressure stream of water to excavate a small trench or furrow into which the seed is dispensed. A perforated metal tube angling rearwardly from the drop tube dissipates the energy of the carrier water to assure that the seed is not washed from the trench. A trench closer trails the planting shoe to push some of the dislodged soil over the seed and cover the furrow.U

Distribution manifold for mobile span-and-tower irrigation systems

A field planting system for use in conjunction with large span and wheel tower irrigation apparatus to place seed in a field across a number of rows simultaneously. Seed is suspended uniformly in a gel solution and injected into a stream of carrier water. The seeds, suspended in water, travel in piping separate from irrigation piping to a manifold suspended from the overhead span section. Each manifold distributes seed and carrier water to a plurality of drop tubes. A tube valve located in each drop tube is closed to permit the manifold to be charged with seeds and water under pressure. Once the manifold is charged, the tube valves open simultaneously and the water and seed discharges from the manifold through drop tubes to a planting shoe. The planting shoe includes a forward nozzle to emit a high pressure stream of water to excavate a small trench or furrow into which the seed is dispensed. A perforated metal tube angling rearwardly from the drop tube dissipates the energy of the carrier water to assure that the seed is not washed from the trench. A trench closer trails the planting shoe to push some of the dislodged soil over the seed and cover the furrow.U

Estimating the Spatial Distribution of Groundwater Demand In the Texas High Plains

Developing groundwater management plans requires a good understanding of the interdependence of groundwater hydrology and producer water use behavior. While state-of-the-art groundwater models require water demand data at highly disaggregated levels, the lack of producer water use data has held up the progress to meet that need. This paper proposes an econometric framework that links county-level crop acreage data to well-level hydrologic data to produce heterogeneous patterns of crop choice and irrigation practices within a county. Together with agronomic data on irrigation water requirements of various crops and irrigation practices, this model permits estimation of the water demand distribution within a county. We apply this model to a panel of 16 counties in the Southern Texas High Plains from 1972 to 2000. The results obtained not only are consistent with those from the traditional multinomial logit land use model, but also indicate the presence of large intra- and inter-county heterogeneity in producer water use behavior

Hydrogen Peroxide Treatment of Manganese Clogged SDI Emitters Written for presentation at the 2009 ASABE Annual International Meeting Sponsored by ASABE Grand Sierra Resort and Casino

Abstract. Dissolved manganese in irrigation water has contributed to emitter clogging of subsurface drip irrigation (SDI) systems in the Texa