Data/hora: 17/06/2024 17:44:05

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	11/09/1996	
Data da última atualização: 	11/09/1996	
Autoria: 	VALLIS, I.	
Afiliação: 	Division of Tropical Pasture, C.S.I.R.O., Mill Road, St. Lucia, Queensland, Australia.	
Título: 	Sampling for soil nitrogen changes in large areas of grazed pastures.	
Ano de publicação: 	1973	
Fonte/Imprenta: 	Communications in Soil Science and Plant Analysis, v.4, n.2, p.163-170, 1973.	
Idioma: 	Inglês	
Conteúdo: 	Lateral variation in soil N content was studied in five pastures to find the best method of sampling for precise estimates of changes in soil N content with time. Variation increased with sampling area up to, but not beyond, 1.2 - 2.4 ha. Consequently, the most efficient method of sampling for changes in N content was to repeatedly sample a fixed set of small sites. An allocation of 1-3 cores per siute was shown to be optimum. The number of cores needed to measure a change in N content in a field with a probability of 0.8 that the 0.95 confidence limits of the mean change would be within +- 50 kg N ha-1 ranged from 150 to 1000. 	
Palavras-Chave: 	Pasture; Soil nitrogen.	
Thesagro: 	Nitrogênio; Pastagem; Solo.	
Thesaurus Nal: 	sampling.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (33040-1) - ADD - SP - -- - SP3283 -  - 3283 - DIS