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FORAGE & GRAZING LANDS

Nitrogen Source and Rate Effects on the Production of Buffalograss Forage Grown with Irrigation

^a USDA-ARS, Southern Plains Range Res. Stn., 2000 18th Street, Woodward, OK 73801
^b Oklahoma State Univ., Dep. of Plant and Soil Sciences, Stillwater, OK 74078

^* Corresponding author (tspringer{at}spa.ars.usda.gov)

Application of livestock manure to crop lands is one method of recycling nutrients. An experiment was conducted to determine the effect of applying solid cattle (Bos spp.) manure (SCM), liquid swine (Sus spp.) effluent (LSE), or commercial fertilizer (CF; urea) at three application rates (0, 120, or 240 kg N ha^–1) on the yield, plant canopy height, and nutritive value (crude protein, CP; and in vitro organic matter digestibility, IVOMD) of buffalograss [Buchloë dactyloides (Nutt.) Engelm.] forage grown with irrigation during a 4-yr period. Two forage harvests were made in each of four growing seasons, and canopy height was measured before each harvest. For all N sources, seasonal dry matter yield (DMY), canopy height, and CP increased as N rate increased during each of the 3 yr following establishment. However, as the buffalograss stand aged, the yield, canopy height, and nutritive value of forage declined. Given the availability of livestock manure in the High Plains region of the USA and the need to recycle this by-product from confined animal feeding operations, the application of livestock manure to buffalograss grown with irrigation for hay or pasture could be a viable and sustainable production system. Future work should address the long-term effects of applying livestock manure to soils in relation to nutrient loading and water quality.

Abbreviations: CF, commercial fertilizer–urea • CP, crude protein • DM, dry matter • DMY, dry matter yield • IVOMD, in vitro organic matter digestibility • LSE, liquid swine effluent • SCM, solid cattle manure

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Crop Science 2005 45: vi. [Full Text]