Contribution of Stems and Leaves to the Composition and Nutrient Content of Irrigated Bromegrass at Different Stages of Development

Kilcher, M. R.; Troelsen, J. E.

doi:10.4141/cjps73-149

Cited by 18 publications

(18 citation statements)

References 2 publications

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“…The average CP content observed in plants in this study was greater than the 90 g kg -1 DM observed by Kilcher and Troelsen (1973) for irrigated smooth brome, indicating an earlier maturing or earlier termination of the growth cycle in the latter. The CP content of Bromus-Poa plants falls well within the National Research Council (1984,1989) range of values considered adequate to meet protein requirement of all classes of grazing cattle: cows nursing calves and dry pregnant mature cows require a total protein level in rations of 92 g kg -1 DM and 59g kg -1 DM, respectively.…”

Section: Nutritive Value Responsementioning

confidence: 79%

Bromus-Poaresponse to defoliation intensity and frequency under three soil moisture levels

Donkor¹,

Bork²,

Hudson³

2002

Can. J. Plant Sci.

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Smooth brome (Bromus inermis Leyss.) and Kentucky bluegrass (Poa pratensis L.) are important herbage for livestock and wildlife in Aspen-Boreal ecosystems in central Alberta, but there is paucity of information on the relationship between soil moisture and defoliation regimes on herbage production in these ecosystems. In a greenhouse experiment, we evaluated the effect of Bromus-Poa defoliation frequencies (2 or 4 wk) and intensities (2.5, 7.5, or 15 cm above the soil surface) under three soil moisture regimes [field capacity (wet), 50% field capacity (moist), 20% field capacity (dry)] on dry matter (DM) yield. Crude protein (CP) content, crude protein yield (CPY) and neutral detergent fiber (NDF) were also determined for herbage harvested. Total accumulated shoot DM decreased under defoliation compared to the undefoliated control, was higher if plants were clipped every 4 wk, rather than 2 wk, and increased with increasing soil moisture availability. Defoliation regimes decreased root DM Compared to the undefoliated control. Soil moisture regime did not significantly affect below-ground DM production, but root:shoot ratio increased significantly with decreasing moisture supply. The average CP content of grasses ranged from 12 to 23%, but was adequate to meet crude protein requirements of growing, pregnant or lactating grazing cattle (Bos spp.) The CPY decreased with increasing moisture stress, and was greatest when plants were clipped at a 7.5-cm height. Shoot NDF concentration increased with decreasing clipping frequency. These result indicate the need to investigate the relationship between soil moisture and management practices that affect the productivity of tame pastures in Aspen-Boreal ecosystems. Key words: Bromus inermis, Poa pratensis, crude protein, neutral detergent fiber, water

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Section: Nutritive Value Responsementioning

confidence: 79%

Bromus-Poaresponse to defoliation intensity and frequency under three soil moisture levels

Donkor¹,

Bork²,

Hudson³

2002

Can. J. Plant Sci.

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“…Unfortunately, only 20% of the whole-plant DM is leaves at the dough stage (Kilcher and Troelsen 1973;Cherney and Marten 1982b (Conrad 1966 …”

Section: Digestibility Of Leaf Materials Declines Aftermentioning

confidence: 99%

“…Bien qu'on ne connaisse pas l'ampleur de I'effet compensatoire, la meilleure qualit6 fourragbre des m6langes devrait compenser, du moins en partie, la l6gdre baisse de leur rendement de MS par rapport aux c6r6ales de printemps. (Kilcher and Troelsen 1973;Cherney and Marten 1982a).…”

unclassified

“…Leaves have a lower cell wall concentration than stems, while grain has the lowest fibre content at this stage (Kilcher and Troelsen 1913;Cherney and Marten 1982b). Even though grain is highly digestible and increases as a proportion of the whole-plant after flowering, its contribution to whole-plant digestibility appears to be partially offset or even negated by lignification of the stem cell walls (Kilcher and Troelsen 1973;Cherney and Marten 1982b).…”

mentioning

confidence: 99%

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Post-flowering forage potential of spring and winter cereal mixtures

Baron¹,

Dick²,

Najda³

et al. 1992

Can. J. Plant Sci.

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“…Forage quality is affected by the partitioning of dry matter into leaves and stems. Kilcher and Troelsen (7) reported that leaves of smooth bromegrass (Bromus inermis Leyss.) were more digestible than stems, and digestibility of stems declined with plant maturity 677 at a more rapid rate and to a lower level than for leaves.…”

mentioning

confidence: 99%

Growth, Water‐Use Efficiency, and Digestibility of Crested, Intermediate, and Western Wheatgrass

Frank

Karn

1988

Agronomy Journal

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Relationships between dry matter distribution among plant components, growth rates, in vitro digestible organic matter (IVDOM), and water-use efficiency (WUE) have not been defined for cool-season wheatgrass species grown on the Northern Great Plains. Three cultivars each of crested wheatgrass (Agropyron desertorum (Fisch. ex Link) Schult.}, intermediate wheatgrass (Elytrigia intermedia (Host) Nevsk: Syn: A. intermedium (Host) Beauv.}, and western wheatgrass (Pascopyrum smithii (Rhdb.) LOve Syn: A. smithii Rydb.} were field grown and sampled over a 3-yr period to define these relationships. The soil was a Parshall fine sandy loam (coarse-loamy, mixed Pachic Haploboroll). Forage was harvested at three dates to measure IVDOM, WUE, forage yield, leaf area index (LAI), and leaf and stem dry matter. Significant differences were mainly present among cultivars of western wheatgrass compared to those of crested and intermediate wheatgrass. 'Rodan' western wheatgrass partitioned more dry matter into stems than leaves, which resulted in lower LAI, leaf/stem ratio (LSR), and IVDOM. However, Rodan had higher WUE and forage yield than did 'Flintlock' and 'Rosana' western wheatgrass. Although forage yield and IVDOM differed among western wheatgrass cultivars, there were no differences in total digestible organic matter. Growth analysis showed Rodan western wheatgrass to be more efficient than Flintlock and Rosana in accumulation of dry matter per unit of photosynthesizing leaf surface. These results suggest that partitioning of dry matter into leaves and stems is a primary factor in determining WUE and digestibility, especially for western wheatgrass.of cool season grass species and varieties using in vivo and in vitro techniques. Agron. J. 63:241-245.

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Contribution of Stems and Leaves to the Composition and Nutrient Content of Irrigated Bromegrass at Different Stages of Development

Cited by 18 publications

References 2 publications

Bromus-Poaresponse to defoliation intensity and frequency under three soil moisture levels

Bromus-Poaresponse to defoliation intensity and frequency under three soil moisture levels

Post-flowering forage potential of spring and winter cereal mixtures

Growth, Water‐Use Efficiency, and Digestibility of Crested, Intermediate, and Western Wheatgrass

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