PUBLICATIONS 2004 http://forageresearch.tamu.edu Forage Research in Texas 2004. CPR-5267 Native, Perennial, Warm-Season, Herbaceous Legumes for the Cross Timbers Catherine Packard, Judy Taylor and James P. Muir bundleflowers. All entries maintained seed production and improved forage Summary and Application yield after perenniating the third season. Perennial, herbaceous native warm- season legumes were evaluated to Introduction determine forage yield, crude protein (CP), and seed production. Fifteen Pasture and range comprise about 90% of entries were planted in 2000 and the agricultural land use in the south-central evaluated in 2001 and 2002. The species USA (Greene, 1997; Anonymous, 1995). evaluated were yellow puff neptunia Summer pasture forage quality for this (Neptunia lutea), tropical neptunia region is often insufficient to meet the (Neptunia pubescens), prairie acacia nutritional needs of livestock and wildlife. (Acacia angustissima), prairie bundle- Legumes are known for improving soil flower (Desmanthus leptolobus), velvet fertility by fixing atmospheric nitrogen and bundle-flower (Desmanthus velutinus), producing forage with high protein content Illinois bundle-flower (Desmanthus (Iglesias and Lloveras, 1998). Legumes can illinoensis), sharp-pod bundle-flower also have double the CP concentration of (Desmanthus acuminatus), scarlet-pea grasses without the need for expensive N (Indigofera miniata var. leptosephala), fertilizers (White and Wight, 1984). downy milk-pea (Galactia volubilis), tall Native warm-season herbaceous legumes bush-clover (Lespedeza stuevei), trailing from the Texas Cross Timbers are bush-clover (Lespedeza procumbens), potentially useful for native prairie and Tweedy’s tick-clover (Desmodium woodland restoration, deer plots, goat tweedyi), Nuttall’s tick-clover (Desmodium browse, and cattle pastures. These native nuttallii), American snout-bean legumes provide food and protection for (Rhynchosia americana) and Texan snout- wildlife; they also increase forage quality for bean (Rhynchosia senna var. texana). livestock during the warm season (Osman et Sub-plots were harvested after flowering al., 2002). At present, native warm-season or the plants had reached the perimeter herbaceous legumes are not being widely of the 3 ft X 6 ft plot and continued to be seeded in rangelands and cultivated pastures harvested monthly until the end of the to compliment native and introduced season. Prairie acacia and yellow-puff grasses. Illinois bundleflower cv. Sabine and neptunia had forage yields over 4,500 showy partridge-pea (Chamaecrista lbs/acre/year. Both tall and sharp-pod fasciculata) are the only native legumes bush-clovers had forage CP commercially available and both have concentrations below 12% while sharp- limitations in forage distribution (Sabine is pod and prairie bundleflowers had CP productive only in early summer) or concentrations over 20%. Average seed palatability (partridge pea is rejected by yields from unharvested plants, most herbivores). measurable on only 8 entries, were The objectives of this study were to greatest for Illinois and prairie evaluate forage yield and nutritional value as http://forageresearch.tamu.edu Forage Research in Texas 2004. CPR-5267 well as seed production of 15 herbaceous, Seed Yield perennial legumes native to the Texas Cross Timbers. Illinois and prairie bundle-flowers both produced about the equivalent of 700 lbs Methods and Materials seed/acre/year on unharvested plants (Fig. 1) while other entries produced considerably The data was collected at the less. Stephenville Texas Agricultural Experiment Station during the spring and summer of 800 2001 and 2002. Fifteen perennial, native, 700 warm-season herbaceous legumes originally 600 collected in the Cross Timbers were 500 evaluated to determine forage and seed yields as well as forage nutritional value. 400 Irrigation was applied up to monthly 30-year 300 Lbs seed/acre/year precipitation averages. Plants were divided 200 into harvest and no-harvest subplots, the 100 latter used for measuring seed yields. Forage CP was determined from sub-plots harvested 0 throughout the season at intervals of thirty Scarlet-pea days, once plots were covered, at a 4 in. Prairie acacia Tall bush-clover Trailing bush-clover stubble-height. Forage yield per acre was Illinois bundle-flower Prairie bundle-flower Velvet bundle-flower American snout-bean estimated from per plant yields during the second year of the trial when most plants Fig. 1 Seed yields per unharvested plants were three years old and would be the averaged over the two-year trial period equivalent of growing these legumes in pure (LSD0.05=106) estimated from a per plant stands with no weed competition. Seed basis. production was measured on no-harvest subplots throughout the season by manually Forage Production collecting ripened pods. During the last year of the trial, most of Results and Discussion the legumes produced over a ton of forage per acre equivalent as measured on per plant May-October (growing season) rainfall in basis, indicating that these species, when 2001 was 11 in., 40% below the 30-year present in significant populations, can average, and 23 in. in 2002, 25% above the contribute considerable forage (Fig. 2). 30-year average. There were year by entry interactions for seed and forage yields, so these values are reported for the high rainfall year when plants were well established. The CP values are an average of both years. http://forageresearch.tamu.edu Forage Research in Texas 2004. CPR-5267 5000 4500 Both bush-clovers had low CP levels, close 4000 to 11%. 3500 3000 Conclusions 2500 2000 1500 Seed yield is important for stand 1000 persistence, seedling recruitment or feeding Forage lb/acre/year 500 game birds. Most of the entries where seed 0 production was measurable produced sufficient amounts of seed to guarantee soil Scarlet-pea Praire acacia seed banks, even if predation by insects, Tall bush-clover Downy milk-pea Texan snout-bean Tropical neptunia Nuttall's tick-clover Velvet bundle-flower Prairie bundle-flowerTrailing bush-clover Illinois bundle-flowerYellow-puff neptunia American snout-bean rodents or birds occurs. The next question Sharp-pod bundle-flower that needs to be studied is whether game Fig. 2 Forage yields of three-year old birds find these seeds palatable and native, herbaceous legumes (LSD = 25) 0.05 nutritious. estimated from a per plant basis. Quality and quantity of forages is of greater importance when feeding white- Prairie acacia and yellow puff neptunia had tailed deer or domesticated herbivores. The the greatest forage yields. Texan snout-bean CP levels in the legume species were and Nuttall’s tick-clover both produced less generally good, especially among the than 500 lbs/acre/year equivalent. bundle-flowers. At these levels, even if forage yields are low, they will contribute 25 considerably to the nutrition of browsing 20 herbivores capable of harvesting leaves and growing points that have the greatest 15 concentration of digestible nutrients. Three of the entries studied had forage CP % 10 yields per plant equivalent to over 2 tons/acre/year. Illinois bundle-flower is 5 notable for being among the greatest forage and seed producers. In others, there appears 0 to be a trade-off in forage and seed yield, so producers may have to choose species scarlet-pea prairie acacia according to their production priorities. tall bush-clover downy milk-pea tropical neptunia Texan snout-bean Nuttall's tick-clover trailing bush-cloverTweedy's tick-clover velvet bundle-flowerillinois bundle-floweryellow-puff neptuniaprairie bundle-flower Species with superior forage production and American snout-bean sharp-pod bundle-flower high CP concentration will be more Fig. 3 Forage crude protein concentration appropriate for white-tailed deer plantings averaged over the two-year trial period while species that produce high seed yield (LSD0.05= 3.4). would be more useful for quail or turkey. Those interested in improving nutrition of Crude Protein both white-tailed deer and game birds would Crude Protein was highest in prairie have to choose entries that compromise bundle-flower at 22% over the two-year between seed and forage production or plant period while sharp-pod bundle-flower had mixtures of species. the second highest CP level at 20% (Fig.3). Except for Illinois bundle-flower cv. Sabine, none of these species are presently http://forageresearch.tamu.edu Forage Research in Texas 2004. CPR-5267 available on a commercial basis. Techniques for maximizing seed production and harvest need to be developed. If wildlife enthusiasts and those purely interested in re-establishing native prairie and woodland bio-diversity show an interest, there may be a huge market for these native Texas legumes in the near future. Indigofera miniata Scarlet pea Desmanthus illinoensis Desmodium tweedyi Illinois bundleflower Tweedy’s tick-clover Lespedeza stuevei Tall bush-clover Rhynchosia americana American snout-bean http://forageresearch.tamu.edu Forage Research in Texas 2004. CPR-5267 Desmodium nuttallii Desmanthus acuminatus Nuttall’s tick-clover Sharp-pod bundleflower Desmanthus velutinus Rhynchosia senna var. texana Velvet bundleflower Texan snout-bean Galactia volubilis Downy milk-pea Desmanthus leptolobus Prairie bundleflower http://forageresearch.tamu.edu Forage Research in Texas 2004. CPR-5267 Neptunia lutea Yellow puff, Yellow neptunia Lespedeza procumbens Trailing bush clover Acacia angustissima Fig. 4 Native Texas herbaceous legumes prairie