Burning of Northern Mixed Prairie during Drought

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Abstract
Standing crop of current year''s growth and response of key management species [primarily Andropogon gerardi, A. smithii, Poa pratensis, Stipa spp. and Carex spp.] were evaluated following burning in mid-May (before emergence of warm-season grasses) and mid-June (after emergence of warm-season grasses). The study was conducted during 2 dry years in a mesic mixed prairie in South Dakota [USA]. Cool-season precipitation was 33% below average in both years of the study, while warm-season precipitation was only slightly below average both years. Standing crop of current year''s growth was increased by burning on overflow range sites, but not on silty range sites. Big bluestem (A. gerardi) standing crop was greatest with mid-May burning. Kentucky bluegrass (P. pratensis) standing crop and leaf length were reduced with burning on both dates. Leaf length, basal area and number of inflorescences of native cool-season grasses were also reduced. Mid-May burning in drought years may be recommended for the reduction of Kentucky bluegrass. Reductions in production of native cool-season vegetation can be expected on silty range sites. Mid-June burning in dry years is not recommended.