Green-Tree Reservoir Management Page: Green-Tree Reservoir Management
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and produce abundant mast. Of this 80 square feet BA, preferred species should
occupy from 40-60 square feet.
2. Maintain a variety of mast producers because no single species will produce
suitable quantities of mast every year.
3. Remove or kill low value trees to make room for better mast producers. Remove or
kill stunted trees of all species that show no sign of mast production. A few standing
dead trees are desirable nest sites of wood ducks and other cavity nesting wildlife.
4. Obtain optimum mast production from trees with d.b.h. (diameter of atree at 4.5 feet
above the ground) of 14-30 inches. Optimum mast production can be sustained by
maintaining a good supply of middle age and younger trees in the stand. Healthy
forest stands in GTR location should have an even distribution of desirable mast
producers from seedlings through middle age pole timber to older saw timber.
5. Create or retain large den trees and snags that might be suitable for nesting by wood
ducks and other wildlife.
In addition, cattle grazing should be eliminated or controlled to prevent damage to
hardwood regeneration. GTR sites should be protected from fire.
Openings. Natural openings or artificially maintained openings (1/2+ acres in size)
can provide diversity and produce additional foods, and provide a different setting for
hunting.
Hunting over plantings of small grain crops in the openings are legal only if normal
agricultural practices are conducted in their planting and harvest. If normal procedures
are not followed, hunting is not legal.
For openings that remain moist or wet most of the year, native wetland plants can
produce desirable duck food. Some sites may be suitable for planting Japanese millet
in mid to late July. Best results with Japanese millet plantings are obtained by disking
and fertilizing seedbeds. Broadcast seeding at rates of 10-15 pounds per acre are
recommended. Light harrowing may be necessary to cover seed.
Openings that are high and remain dry most of the spring and summer (and are not
needed for tree reproduction), should be planted to small grains. Some suitable species
are corn, browntop millet, Japanese millet, pearl millet, proso millet and soybean. A soil
test should be conducted to determine liming and fertilization rates, and an opening of
at least 2 acres is needed for high grain production.
Hunting. Half-day morning hunts should be conducted no more than 2-3 days per
week to prevent scaring ducks away from the site.
Wetlands and the Law
The U.S. Army Corps of Engineers and the Texas Water Commission regulate the
discharge of dredge or fill material in wetlands, and the retention of public water for
private use, respectively. Before constructing a GTR, they must be contacted to find
out about existing regulations.
Assistance
Assistance in developing plans for Green-Tree Reservoirs and other wildlife
management activities can be obtained by contacting the Parks and Wildlife Department,
Wildlife Division, 4200 Smith School Road, Austin, Texas 78744; 1-800-792-1112, Attn:
Technical Guidance.
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Ortego, Brent; Frentress, Carl; Haucke, Hayden & Rose, Julie Hogan. Green-Tree Reservoir Management, pamphlet, November 1988; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth639001/m1/5/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.