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Annual ryegrass seed yield response to grazing during early stem elongation

Young, William C. ; Chilcote, David O. ; Youngberg, Harold W.

Agronomy journal, 1996-03, Vol.88 (2), p.211-215 [Periódico revisado por pares]

Madison, WI: American Society of Agronomy

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Título:
Annual ryegrass seed yield response to grazing during early stem elongation
Autor: Young, William C. ; Chilcote, David O. ; Youngberg, Harold W.
Assuntos: Agronomy. Soil science and plant productions ; apical meristems ; Biological and medical sciences ; calidad ; caracteres de rendimiento ; choix de la date ; composante de rendement ; crop yield ; developmental stages ; duracion ; duration ; duree ; eleccion de la epoca ; etapas de desarrollo ; etapas de desarrollo de la planta ; Fundamental and applied biological sciences. Psychology ; General agronomy. Plant production ; Generalities. Agricultural and farming systems. Agricultural development ; Generalities. Production, biomass, yield. Quality ; germinacion ; germination ; graine ; grazing ; lolium multiflorum ; meristemas apicales ; meristeme apical ; oregon ; ovin ; ovinos ; pastizales ; pastoreo ; pastures ; paturage ; paturages ; plant developmental stages ; plantulas ; plantule ; qualite ; quality ; rendement des cultures ; rendimiento de cultivos ; seed ; seedlings ; seeds ; semence ; semilla ; semillas ; sheep ; stade de developpement ; stade de developpement vegetal ; stems ; tallo ; tige ; timing ; yield components
É parte de: Agronomy journal, 1996-03, Vol.88 (2), p.211-215
Notas: F
F01
Contribution from Oregon Agric. Exp. Stn., Tech. Paper no. 10674.
Descrição: Spring grazing annual ryegrass (Lolium multiflorum Lam.) seed fields with sheep (Ovis aries) is a common practice. The effects of grazing duration in early stages of stem elongation on seed yield and its components are not well known. We studied four durations of spring grazing annual ryegrass with sheep over a 2-yr period on an Argiaquic Xeric Argialboll soil. Grazing was begun before onset of stem elongation. Treatments were no grazing (G0) and grazing until one-third (G1), two-thirds (G2), or all (G3) primary tillers had their apical meristems removed. Leaf area was progressively reduced by grazing duration. The number of fertile tillers increased with grazing duration in the first year, but the effect was not significant in the second year. Grazing did not affect the number of spikelets per spike or florets per spikelet in the first year. In the second year, G2 and G3 reduced spikelets per spike and had no effect on the number of florets per spikelet, whereas G1 did not affect either character. Both G2 and G3 decreased seed weight in the first year, while G1 had no effect; treatments did not affect seed weight in the second year. Grazing treatment did not affect total herbage dry matter at seed maturity, seed yield, or seed quality in either year. We conclude that, in western Oregon, grazing annual ryegrass in late winter and early spring up to the time when the apical meristem of all primary tillers are removed (G3) does not reduce seed yield. Grazing until about one-third of primary tillers lose their apical meristem (G1) may actually improve seed yield.
Editor: Madison, WI: American Society of Agronomy
Idioma: Inglês

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Annual ryegrass seed yield response to grazing during early stem elongation

Young, William C. ; Chilcote, David O. ; Youngberg, Harold W.

Madison, WI: American Society of Agronomy

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