Previous grazing or clipping affects seed of Indian ricegrass

Previous heavy grazing for more than 50 years, compared with protection from livestock grazing, in the semi-arid area of Chaco Canyon in the southwestern United States did not result in any significant decrease in seed production potential of Indian ricegrass [Oryzopsis hymenoides (Roem. and Schult....

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Bibliographic Details
Published in:Journal of range management 1998-01, Vol.51 (1), p.37-41
Main Authors: Orodho, A.B, Cuany, R.L, Trlica, M.J
Format: Article
Language:English
Subjects:
BIOLOGICAL DIFFERENCES
Canyons
COLORADO
CULTIVARS
DEFOLIACION
DEFOLIATION
DIFERENCIAS BIOLOGICAS
DIFFERENCE BIOLOGIQUE
DORMANCE
DORMANCY
DORMICION
ESCARIFICACION
FREQUENCY
GENETIC CHANGE
GENETICA
GENETICS
GENETIQUE
GERMINACION
GERMINATION
GRAINE
Grasses
GRAZING
NEW MEXICO
NOUVEAU MEXIQUE
NUEVO MEXICO
ORYZOPSIS
ORYZOPSIS HYMENOIDES
PASTOREO
PATURAGE
PESO DE LAS SEMILLAS
Plant Ecology
Plants
POIDS DES SEMENCES
RECALCITRANT SEEDS
SCARIFICATION
SEED
SEED OUTPUT
Seed production
Seed productivity
SEED WEIGHT
SEEDS
SEMENCE
SEMILLA
SEMILLAS
STRAIN DIFFERENCES
VARIEDADES
VARIETE
VARIETIES
VIABILIDAD
VIABILITE
VIABILITY
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Summary:Previous heavy grazing for more than 50 years, compared with protection from livestock grazing, in the semi-arid area of Chaco Canyon in the southwestern United States did not result in any significant decrease in seed production potential of Indian ricegrass [Oryzopsis hymenoides (Roem. and Schult.) Ricker]. There also were no significant differences in seed production between grazed and ungrazed collections of Indian ricegrass from the Chaco Canyon study site when transplanted and grown in a common garden. This indicated that long-term protection from livestock grazing probably had not genetically (ecotypically) altered seed production potential. Both grazed and ungrazed transplants of Indian ricegrass differed in seed production from the cultivars 'Paloma' and 'Nezpar'. Nezpar produced the greatest seed yield (312 kg/ha), while Paloma had the lowest yield (78 kg/ha). Defoliation about 1 June over a 2-year period reduced seed production and nitrogen fertilization did not increase seed yield. Previous grazing history had little effect on seed germination, but there were significant differences in germination among some collections and cultivars of Indian ricegrass. Germination was less than 5% for all entries. A tetrazolium viability test showed that seed of native strains were more viable than those of Paloma. Dormancy is a troublesome, but desirable, trait of Indian ricegrass seed for use in droughty areas
ISSN:0022-409X
2162-2728
DOI:10.2307/4003561