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Texoma

Technical Summary

Texoma is located in north central Texas south of Lake Texoma and the Red River that borders the states of Oklahoma and Texas. This AVA was established in January of 2006, covers approximately 2.3 million acres, and includes Montague, Cooke, Grayson, and Fannin counties. The Texoma region is where 19th century viticulturist Thomas Volney Munson discovered that grafting Vitis vinifera grapevines onto Native American varieties of vine rootstock resulted in vines that were resistant to the insect pest phylloxera. The landscape of the Texoma AVA slopes northward towards the Red River. The elevation ranges from a low of 129m in the north east to a high of 402m on ridges in southeast Montague County. Lake Texoma and the Red River are two prominent water bodies in the area.

Soils

There are 23 different soil associations randomly distributed throughout the Texoma AVA. The texture of soils in this region consists mostly of sandy loam, silty clay loam, and clay. There is a broad range of values for available water capacity (AWC) ranging from 6cm to 32cm which may be attributed to the wide array of different soil associations in the region. The average soil permeability is 2.48cm/hr. and soil bulk density is 1.59g/cm3 in the region. The average soil depth is approximately 128.58cm with a number of various soil texture types in the Texoma AVA. This depiction of soil texture type is at a depth of 80cm.The average pH values of approximately 6.81. The pH range of 5.30 to 8.20 is rather broad and more acidic than other AVAs but may also be attributed to the number of different soil associations located in the Texoma AVA.

Climate

The minimum temperature readings during the winter months are drop as low as -10ºC with highs around 11ºC. The summer months exhibit much less variation with readings from 15º to 21ºC. Average temperature in the winter months again show quite a bit of variation dropping below 0ºC but highs are often well above 20ºC. The summer months show slight, if any variation with temperature fluctuating around 33ºC. Maximum temperature readings for winter months also show a fair degree of variation while summer months exhibit relatively less. The average annual precipitation of this AVA displays a distinct east to west trend with higher precipitation values in the far eastern parts of the regions and lower values in the west and North West. The range for precipitation in the region is 84-124cm annually which is one of the highest of all the Texas AVAs.

The Cumulative growing degree days (April-October, 10ºC base) for Texoma AVA range from 2767 to 2970 days (ºC). The general trend in the region is greater solar radiation in areas of higher elevation This trend does not seem to hold during the months of August and September as areas of low elevation have values of solar radiation similar to regions at higher elevations. During the spring months and early summer, there is low vapor pressure in areas of higher elevation and high vapor pressure in areas of low elevation. This trend is not followed in late summer and early fall as lower vapor pressure is observed in areas of both high and low elevation The number of frost days follow elevation trends with the eastern part of the region showing fewer frost days due to lower elevation and greater number of frost days in the west where elevation is much greater.

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