Data/hora: 05/06/2024 11:10:29

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	29/01/1996	
Data da última atualização: 	29/01/1996	
Autoria: 	BRAMLEY, R. G. V.; WHITE, R. E.	
Afiliação: 	Massey University.	
Título: 	The effect of pH, liming, moisture and temperature on the activity of nitrifiers in a soil under pasture.	
Ano de publicação: 	1989	
Fonte/Imprenta: 	Australian Journal of Soil Research, v.27, p.711-724, 1989.	
Idioma: 	Inglês	
Conteúdo: 	A short-term nitrification assay (SNA) was used to measure the activity of soil nitrifiers in the field in relation to soil pH and seasonal changes in soil temperature and moisture content. At roughly two-monthly intervals over two successive years, samples of the Tokomaru silt loan which had been limed in 1982 and/or 1987 were analysed in additionto an unlimed control. The SNA analysis was carried out for a range ofph values between 4.5 and 7.5, obtained by amending the incubation medium with small amounts of HCL or KOH. A quadratic curve was fitted to a plot of SNA value v. incubation pH. The fitted equations were used to calculate the pH optimum for nitrification (pHopt), the SNA value atpHopt (SNAopt) and the SNA value at the soil ph at sampling (SNAph).Values of pHopt and the mean soil pH over the year were higher in soillimed in 1982 than control soil; neither variable showed marked changein either soil over the first 320 days of observation. The addition oflime in 1987 raised the mean soil pH and pHopt in unlimed soil, but had negligible effect on either variable in soil limed five years previously. A covariance-type analysis demonstrated that the same quadratic equation could be fitted to each plot of SNA v. incubation pH for eachsoil treatment by changing the intercept parameter (C), i.e. the relationship between nitrifier activity and pH in the four soils remained constant over the year. No significant relationships could be found forthe four soils between soil pH, pHopt, SNA, soil moisture content...	
Palavras-Chave: 	Moisture; Nitrificante; Nitrifiers.	
Thesagro: 	Calagem; Pastagem; Ph; Umidade.	
Thesaurus Nal: 	liming; pastures; temperature.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (4841-1) - ADC - SP - -- -  -  - 1996.00026 - DIS