Data/hora: 19/06/2024 01:23:07

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 01/08/1992
Data da última atualização: | 22/05/2023
Autoria: | ROSS, D. J.; MOLLOY, L. F.; COLLIE, T. W.; BALL, R.
Título: | Influence of fertiliser nitrogen on nitrogen fractions and nonstructural carbohydrates in grazed grass-clover herbage.
Ano de publicação: | 1978
Fonte/Imprenta: | New Zealand Journal of Agricultural Research, v. 21, n. 2, p. 231-239, 1978.
DOI: | https://doi.org/10.1080/00288233.1978.10427404
Idioma: | Inglês
Conteúdo: | Contents of Nand nonstructural carbohydrate fractions were measured over a year in herbage from a grazed ryegrass-white clover pasture, which had been fertilised with limeammonium nitrate at an annual rate of 0 (No), 112 (N112), and 448 (N448) kg N/ha. Total N wntent of the mixed herbage was often greater than 4% dry weight, and was highest in earlY spring and lowest in late summer. Levels in many cuts were increased significantly by the N448 treatment; the N112 treatment had little effect. The non-protein N and nitrate N contents were also highest in the N448 herbage, particularly in early spring; the level of nitrate N was also high in autumn. Most of the nitrate N occurred in the grass component. Total watersoluble carbohydrates, and those soluble in hot water but insoluble in cold water, usually comprised less than 12% and 1% dry w¢ight respectively of the mixed herbage. Total water-soluble carbohydrates were negatively and significantly correlated with both total N ;;nd "protein" N contents. The total N/total water-soluble carbohydrate ratio was, with one exception, greater than 0.3. No clear seasonal trends in the carbohydrate fractions were evident. Effects due to N treatments were generally small although sometimes significant for lhe hot-water-soluble fraction. The highest level of fertiliser N brought about high total N/total water-soluble carbohydrate ratios, and high herbage nitrate N contents, namely 0.66% dry weight in early spring and an average of 0.45% in August-January. The implications of these results for animal health are discussed.
Palavras-Chave: | Herbage crops.
Thesagro: | Adubação; Pastagem.
Thesaurus Nal: | Feed composition; Grasslands; Grazing; Lolium; Nitrogen fertilizers; Nonprotein nitrogen.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (6402-1) - ADD - AP - DD -  -  -  - DIS