Distribution of Potassium, Calcium, Magnesium, and Sodium in Grasses at Progressive Stages of Maturity

Pritchard, Gordon; Pigden, W. J.; Folkins, L. P.

doi:10.4141/cjps64-062

Cited by 17 publications

(11 citation statements)

References 7 publications

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“…Timothy had lower Na and Mg concentrations than most other grass species but tended to have a higher Ca concentration. Pritchard et al (1964), in eastern Canada, also noted that timothy had a low Na concentration. Several studies cited by Whitehead (2000) reported lower Na and Mg concentrations in timothy than orchardgrass; however, Sleper et al (1989) reported a lower Mg concentration in orchardgrass than in timothy.…”

Section: Discussionmentioning

confidence: 95%

“…The proportion of leaves was also probably higher in summer regrowth than in spring growth, even in timothy, the only recurrent‐flowering species (Bélanger and McQueen, 1998). The concentration of certain elements (K, Ca, and Mg) is usually higher in leaves than in stems (Pritchard et al, 1964). This, combined with a greater proportion of leaves in the summer growth, may have counterbalanced the reduced nutrient availability.…”

Section: Discussionmentioning

confidence: 99%

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Dietary Cation Anion Difference of Five Cool‐Season Grasses

et al. 2006

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Forage-based rations with a low dietary cation anion difference (DCAD) should be fed to dairy cows 2 to 4 wk prepartum to prevent hypocalcaemia or milk fever. We evaluated the DCAD of two to four cultivars of five grass species at three locations in Qué bec, Canada. Orchardgrass (Dactylis glomerata L.), meadow bromegrass (Bromus riparius Rehmann), tall fescue (Festuca arundinacea Schreb.), smooth bromegrass (Bromus inermis Leyss.), and timothy (Phleum pratense L.) were harvested twice a year during two production years. Forage mineral concentrations were measured and the DCAD was calculated with a short equation [DCAD S 5 (Na 1 1 K 1 ) 2 (Cl 2 1 S 22 )], and a long equation [DCAD L 5 (Na 1 1 K 1 1 0.15Ca 21 1 0.15Mg 21 ) 2 (Cl 2 1 0.6S 22 1 0.5P 32 ). The five species had, respectively, DCAD S of 656, 540, 510, 490, and 384 mmol c kg 21 DM (dry matter) in spring growth, and 633, 569, 496, 447, and 332 mmol c kg 21 DM in summer regrowth. Orchardgrass had the highest DCAD and timothy the lowest while the three other species were intermediate in both spring growth and summer regrowth. Species differences in DCAD were primarily related to differences in K concentration. Timothy was the only species that decreased significantly in DCAD S (by 52 mmol c kg 21 DM) and DCAD L (by 35 mmol c kg 21 DM) from spring growth to summer regrowth. Cultivars did not differ in DCAD S and DCAD L except for tall fescue. Locations did not differ in DCAD. Among the grass species in this study, and because of its low DCAD, timothy is the best suited for producing forages fed to dairy cows in the weeks preceding calving.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Dietary Cation Anion Difference of Five Cool‐Season Grasses

et al. 2006

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“…The use of only those resources directly invested in seed and pollen ignores two constituents of reproductive effort: investment in unfertilized ovules and in anther walls. Published data (Miller, 1958;Pritchard et al, 1964) allow a crude estimate of sex allocation that includes these structures. Sex allocations so calculated are very similar to those shown in Figure 1, though consistently slightly more male biased.…”

Section: Discussionmentioning

confidence: 99%

Sex Allocation and Outcrossing Rate: A Test of Theoretical Predictions Using Bromegrasses (Bromus)

McKone¹

1987

Evolution

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Predictions of sex-allocation theory were tested by comparisons among hermaphroditic bromegrass (Bromus) species that differed in outcrossing rate. Relative maternal and paternal investment were calculated using both the ratio of pollen to seed production, and absolute allocations in units of energy, nitrogen, phosphorus, potassium, magnesium, and calcium. Outcrossing rate had a large effect on sex allocation; species having greater outcrossing rates had relatively more paternal reproductive effort. Bromus inermis was obligately outcrossing, and nearly half of its reproductive effort was devoted to pollen production. Three partially outcrossed species, B. kalmii, B. ciliatus, and B. latiglumis, invested between 5% and 11% of reproductive effort in pollen production. Paternal investment was less than 2% in the selling species B. tectorum. Estimates of sex allocation were relatively unaffected by the resource currency used in calculation. The differences among species in sex allocation were mostly due to differences in anther size and seed set.>.

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“…95 g/kg on 16 June. Reductions in the Mg concentration during uninterrupted growth in spring were also recorded by Thomas et al (1952), Gue´guen (1959), Fleming & Coulter (1963) and, in timothy and bromegrass (Bromus inermis L.), by Pritchard et al (1964). However, there was very little reduction in the Mg concentration in the grasses sampled by Wilson & McCarrick (1967) and Fleming & Murphy (1968).…”

Section: Ner Al Elem Entsmentioning

confidence: 52%

“…However, there was very little reduction in the Mg concentration in the grasses sampled by Wilson & McCarrick (1967) and Fleming & Murphy (1968). Magnesium appears to be higher in dying and dead than in younger leaf blades (Wilman et al 1994), but lower in ' stems ' (including leaf sheaths) than in leaf blades (Gue´guen 1959;Pritchard et al 1964). It seems that the latter factor usually outweighs the former in determining the Mg concentration of a reproductive grass crop as it develops.…”

Section: Ner Al Elem Entsmentioning

confidence: 94%

Some changes in grass crops during periods of uninterrupted growth

Wilman

2004

J. Agric. Sci.

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Wilman, D. (2004). Some changes in grass crops during periods of uninterrupted growth. Journal of Agricultural Science, 142, (2), 129-140.In order to make informed decisions about the timing of harvests of grass crops, it is helpful to be aware of the changes that are taking place in the crops as they grow. Most people growing grass commercially or experimentally have a general awareness of the more obvious changes. However, greater awareness and understanding should lead to greater precision and greater success in the relevant enterprises. The present review considers some of the more important changes that are of interest from an agricultural point of view and for which sufficient information is available in the scientific literature. It is intended for relevant students, lecturers, research workers, advisers and producers.Peer reviewe

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Distribution of Potassium, Calcium, Magnesium, and Sodium in Grasses at Progressive Stages of Maturity

Cited by 17 publications

References 7 publications

Dietary Cation Anion Difference of Five Cool‐Season Grasses

Dietary Cation Anion Difference of Five Cool‐Season Grasses

Sex Allocation and Outcrossing Rate: A Test of Theoretical Predictions Using Bromegrasses (Bromus)

Some changes in grass crops during periods of uninterrupted growth

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