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Harvest management and N-fertilization effects on yield and regrowth of smooth bromegrass, crested wheatgrass, and meadow bromegrass in the eastern prairies


Harvest management and N-fertilization effects on yield and regrowth of smooth bromegrass, crested wheatgrass, and meadow bromegrass in the eastern prairies



Canadian Journal of Plant Science 76(4): 773-782



ISSN/ISBN: 0008-4220

DOI: 10.4141/cjps96-130

Little information exists describing how pasture-type grasses such as meadow bromegrass (Bromus biebersteinii Roem and Schult.; MBR) may differ from hay-type grasses such as crested wheatgrass (Agropyron cristatum (L.) Gaertn.; CWG) and smooth bromegrass (Bromus inermis Leyss.; SBR) in terms of DMY response to harvest and fertilizer management. In a 3-yr field trial at Brandon, MB, harvest management (two-cut hay management or three- to four-cut simulated pasture management) and nitrogen fertilizer (0, 40, 80, 120, 160 kg N ha-1) were examined for their interactive effects on DMY and percent regrowth of CWG, MBR, and SBR. Grasses managed under a two-cut hay system generally had greater (P lt 0.05) DMY and lower (P lt 0.05) percent regrowth than grasses managed under a three- to four-cut simulated pasture system. There were few consistent differences in DMY between grass species with relative ranking and significance changing between site-years. However, percent regrowth of MBR was always greater (P lt 0.05) than either CWG or SBR, indicating its value in rotational gazing systems. Generally, MBR responded to N-fertilizer in a similar manner to CWG and SBR. Nitrogen fertilization increased (P lt 0.0001) total DMY linearly in all site-years with an apparent optimum of greater than 160 kg N ha-1 yr-1, but percent regrowth did not respond in a consistent manner. Environment, management, and grass species, respectively, accounted for 38.4, 33.2, and 0.6% of the total variation in DMY, emphasizing their relative impact on yield of dryland grasses.

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Accession: 008757028

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