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United States Department of Agriculture

Agricultural Research Service

Irrigated Pastures
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Vision

To develop improved plant materials that enhance productivity of irrigated pastures in semi-arid growing regions.

Research Objectives

  1. Release new varieties with improved nutritional quality, palatability, and livestock utilization.
  2. Develop improved plants that require reduced inputs of irrigation and fertilizer.
  3. Discover improved selection protocols and methods for use in forage germplasm improvement.
  4. Develop new genomic resources for use in evaluation and breeding.
  5. Identify the role of plant endophytes in abiotic and biotic plant stress tolerance in semi-arid growing regions.


Line-source irrigation for drought analysis

Outcomes

  • Improved grass and legume cultivars that have enhanced digestibility, elevated soluble sugar concentrations, and softer, more-palatable leaves to increase animal intake, gains, and health.
  • New grasses and legumes that can survive drought and efficiently utilize limited fertilizer, are compatible in grass/legume mixtures, and will conserve water resources.
  • Research will elucidate how plant spacing, machine harvesting versus livestock grazing, and hybrid vigor affect plant selection to make forage breeding more effective and efficient.
  • Molecular biology tools used in breeding and selection that will elucidate the genetic mechanisms behind increased digestibility, soluble sugar, and soft leaves.
  • Research will determine the extent and differences in plant genetic control versus symbiotic fungal endophyte effects upon drought and other stress tolerances.

Improved Plant and Management Practices

Fescue

  • High-yielding tall fescue cultivars with improved nutritional quality (e.g., higher digestibility and soluble sugars, and lower lignin).
  • Soft-leaved fescue germplasm to be used in breeding programs to improve livestock intake and utilization of tall fescue.
  • Tall fescue cultivars with increased drought tolerance that require less irrigation to maintain high yields.
  • Tall fescue cultivars that are more compatible with nitrogen-fixing legumes for improved economic and environmental sustainability.
  • Genetic mapping in tall fescue to understand traits of interest including soft leaves, higher digestibility, and drought stress.
  • Discovery and development of evaluation and selection methods that allow simulation of seeded stands and grazed pastures.


Highly digestible tall fescue

Bromegrass

  • Recent release of "Cache" meadow bromegrass (2004) with improved yield under reduced irrigation.
  • High-yielding, drought-tolerant meadow bromegrass cultivars for dryland (very limited irrigation) pastures.


"Cache" meadow bromegrass

Legumes

  • Recent release of "Don" yellow-flowered alfalfa (2008) with extreme persistence under reduced irrigation.  "Don" also possesses a lower growth form that mixes well with grasses to provide nitrogen for grasses.
  • High-yielding, salt-tolerant, spreading-type (rhizomatous) alfalfa cultivars which are adapted to the intensive grazing.
  • Non-bloating birdsfoot trefoil cultivars that are high-yielding and persistent under intensive grazing in irrigated pastures.
  • Drought-tolerant, upright cultivars of cicer milkvetch and kura clover as legume components in pasture mixes.
  • Identify growth factors that influence compatibility of legume/grass mixtures and their interaction with the environment.
  • Identify and map genes controlling salt tolerance in legumes.

   

Non-spreading (left) and spreading (right) alfalfa

Trefoil grazing persistence study

Orchardgrass

  • Orchardgrass germplasm with improved winter survival for high-elevation, cold-temperate regions.
  • Identify hybrid vigor groups that lead to high-yielding, persistent orchardgrass hybrids and cultivars.
  • Develop novel orchardgrass germplasm that will be used for gene mapping and incorporation of improved stress tolerance and the forage production into current populations.


Orchardgrass grazing study

Warm-season Grasses

  • Assess the feasibility and utility of warm-season grasses for grazing in areas with predominantly cool-season grass pastures.
  • Develop switchgrass cultivars adapted to the irrigated pastures of the semi-arid western U.S.


Warm-season grasses in a temperate environment

Endophytes

  • Collect and evaluate the potential of new fungal endophytes to improve drought, salt, and insect tolerance in grasses.
  • Develop methods to transfer potentially beneficial endophytes into pasture grass species.

Seed available from the Utah Crop Improvement Association  1-435-797-2082


Last Modified: 4/21/2009
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