Data/hora: 10/06/2024 17:11:15

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 01/08/1992
Data da última atualização: | 04/01/2024
Autoria: | VALLIS, I.; HARPER, L. A.; CATCHPOOLE, V. R.; WEIER, K. L.
Título: | Volatilization of ammonia from urine patehes in a subtropical pasture.
Ano de publicação: | 1982
Fonte/Imprenta: | Australian Journal of Agricultural Research, v. 33, n. 1, p. 97-107, 1982.
DOI: | https://doi.org/10.1071/AR9820097
Idioma: | Inglês
Conteúdo: | Abstract: Ammonia volatilization from artificially applied cattle urine was measured in a fertilized (374 kg nitrogen ha-1 year-1) and grazed (4 beef steers ha-1) pasture of Nandi setaria (Setaria sphacelata var. sericea) in south-eastern Queensland. Microplots (0.5 by 0.5 m) of pasture were treated with 1.4 1. of urine (= 37-48 g nitrogen m-2) and evolved ammonia measured with a flow-through chamber system that maintained near ambient temperatures and air flows. Calculated volatilization over a 14-day period was 18.8 % of the applied urine nitrogen in June, 14.4 % in November-December and 28.4 % in February-March. More than half of the volatilization occurred within 48 h of applying the urine. Measurements of soil mineral nitrogen in February-March showed that more than 80% of the urinary urea was hydrolysed within 2 h and only traces remained unhydrolysed after 24 h. Soil ammonium declined from 700 to 1000 ¦g nitrogen cm-3 in the surface 2.5 cm on the first day to near-background levels on the 14th day. Accumulation of nitrate was rapid after the 2nd day, and accounted for one-third of the applied nitrogen by the 14th day. Nitrite reached a maximum of 2.3 % of the applied nitrogen on the 7th day and had virtually disappeared by the 14th day. Only traces of nitrite were detected below 2.5 cm depth.
Palavras-Chave: | Fertilizacao.
Thesagro: | Pastagem.
Thesaurus Nal: | Ammonia; Cattle; Nitrites; Urine; Volatilization.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (5938-1) - ADD - AP - PP - SP 03757 -  - SP 03757 - DIS