Water marketing, which involves the purchase or transfer of water supplies or rights between a willing buyer and seller, represents one strategy for redistributing water resources among competing users. Most frequently, municipalities purchase agricultural water rights to augment their existing supply and help meet projected water demand. In Texas, the most active water market is in the lower Rio Grande Valley where the cities of Brownsville, Harlingen, and McAllen havc acquired surface water rights for converting water from agricultural to municipal and industrial uses. The existence of the Rio Grande Watermaster simplifies the procedure for transferring surface water rights, helps address problems such as the maintenance of instream flow and protection of senior water rights holders, and serves as an administrative model for water resource management. Key Words: water markets, watermaster, allocation, redistributive policy, Texas. 8(1):11-20. soil surveys published between 1973 and 1988.
30(1):13-15.
Studies of soil productivity must compensate for the effects of temporal trends in order to examine the pattern of crop yields along spatial gradients. A n analysis of the published yield estimates for 30 soils in 233 counties, however, did not find consistent yield increases over the past three decades. O n the contrary, the yield estimates for many soils weTe markedly uniform since 1972. The uniformity appears to have two cawes: the acknowledged difficulty of making yield estimates in a time of increasing variability in soil and crop management, both within and between regions, and surveyors' awareness of data stored in a national soils data base. The effect is to cast doubt on soil productivity data reported in county
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