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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
22/05/2023 |
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Autoria: |
METSON, A. J.; SAUNDERS, W. M. H. |
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Título: |
Seasonal variations in chemical composition of pasture. I. Calcium, magnesium, potassium, sodium, and phosphorus. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
New Zealand Agricultural Research, v. 21, n. 2, p. 341-353, 1978. |
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DOI: |
https://doi.org/10.1080/00288233.1978.10427419 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: As part of a study of seasonal variations in chemical composition of pasture herbage Ca, Mg, K, and Na concentrations, and the ratios K/(Ca + Mg) and Ca/P, were determined by monthly samplings at seven sites in the lower North Island. Grass and clover components were harvested separately at six sites, and grasses, clovers, and “other species” (herbs) at the seventh. Sub-plots were harvested by hand shears, after which sheep were allowed to graze before the plots were enclosed until the next sampling date. The seasonal patterns in herbage chemical composition were similar at all sites despite wide differences in soil, climate, and dry matter production. For Ca, the highest values occurred in summer and the lowest in mid winter. Calcium concentrations were higher, and the variations greater, in clovers than in grasses, and concentrations were even higher in “other species”. Trends in Mg were seasonally similar to those for Ca but were much less pronounced; and differences between grasses and clovers were generally small. Potassium showed marked monthly fluctuations which were generally similar in the grass and clover components suggesting an effect of stock urine. High levels occcurred in late winter, with a peak in early spring, and the lowest levels in early bummer. There were no clear trends in Na concentrations, which were generally quite high in both grasses and clovers. Very high levels in “other species” occurred in late autumn to early spring. The K/(Ca + Mg) ratio (in chemical equivalents) in the grass component generally remained above the proposed critical level of 2.2 for 3–4 months at most sites during the winter and early spring, indicating a possible grass tetany hazard. On the other hand, the Ca/P ratio (in percentages) tended to fluctuate about the suggested “ideal” value of 1.5. The results were generally in accord with data from previous investigations on New Zealand pastures. MenosAbstract: As part of a study of seasonal variations in chemical composition of pasture herbage Ca, Mg, K, and Na concentrations, and the ratios K/(Ca + Mg) and Ca/P, were determined by monthly samplings at seven sites in the lower North Island. Grass and clover components were harvested separately at six sites, and grasses, clovers, and “other species” (herbs) at the seventh. Sub-plots were harvested by hand shears, after which sheep were allowed to graze before the plots were enclosed until the next sampling date. The seasonal patterns in herbage chemical composition were similar at all sites despite wide differences in soil, climate, and dry matter production. For Ca, the highest values occurred in summer and the lowest in mid winter. Calcium concentrations were higher, and the variations greater, in clovers than in grasses, and concentrations were even higher in “other species”. Trends in Mg were seasonally similar to those for Ca but were much less pronounced; and differences between grasses and clovers were generally small. Potassium showed marked monthly fluctuations which were generally similar in the grass and clover components suggesting an effect of stock urine. High levels occcurred in late winter, with a peak in early spring, and the lowest levels in early bummer. There were no clear trends in Na concentrations, which were generally quite high in both grasses and clovers. Very high levels in “other species” occurred in late autumn to early spring. The K/(Ca + Mg)... Mostrar Tudo |
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Thesagro: |
Cálcio; Composição Química; Fósforo; Magnésio; Pastagem; Potássio; Sódio. |
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Thesaurus Nal: |
Plant physiology. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02702naa a2200241 a 4500
001 1522094
005 2023-05-22
008 1978 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1080/00288233.1978.10427419$2DOI
100 1 $aMETSON, A. J.
245 $aSeasonal variations in chemical composition of pasture. I. Calcium, magnesium, potassium, sodium, and phosphorus.$h[electronic resource]
260 $c1978
520 $aAbstract: As part of a study of seasonal variations in chemical composition of pasture herbage Ca, Mg, K, and Na concentrations, and the ratios K/(Ca + Mg) and Ca/P, were determined by monthly samplings at seven sites in the lower North Island. Grass and clover components were harvested separately at six sites, and grasses, clovers, and “other species” (herbs) at the seventh. Sub-plots were harvested by hand shears, after which sheep were allowed to graze before the plots were enclosed until the next sampling date. The seasonal patterns in herbage chemical composition were similar at all sites despite wide differences in soil, climate, and dry matter production. For Ca, the highest values occurred in summer and the lowest in mid winter. Calcium concentrations were higher, and the variations greater, in clovers than in grasses, and concentrations were even higher in “other species”. Trends in Mg were seasonally similar to those for Ca but were much less pronounced; and differences between grasses and clovers were generally small. Potassium showed marked monthly fluctuations which were generally similar in the grass and clover components suggesting an effect of stock urine. High levels occcurred in late winter, with a peak in early spring, and the lowest levels in early bummer. There were no clear trends in Na concentrations, which were generally quite high in both grasses and clovers. Very high levels in “other species” occurred in late autumn to early spring. The K/(Ca + Mg) ratio (in chemical equivalents) in the grass component generally remained above the proposed critical level of 2.2 for 3–4 months at most sites during the winter and early spring, indicating a possible grass tetany hazard. On the other hand, the Ca/P ratio (in percentages) tended to fluctuate about the suggested “ideal” value of 1.5. The results were generally in accord with data from previous investigations on New Zealand pastures.
650 $aPlant physiology
650 $aCálcio
650 $aComposição Química
650 $aFósforo
650 $aMagnésio
650 $aPastagem
650 $aPotássio
650 $aSódio
700 1 $aSAUNDERS, W. M. H.
773 $tNew Zealand Agricultural Research$gv. 21, n. 2, p. 341-353, 1978.
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Embrapa Caprinos e Ovinos (CNPC) |
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