Data/hora: 23/04/2024 05:11:25

Biblioteca(s): 	Embrapa Agrobiologia.	
Data corrente: 	02/01/1996	
Data da última atualização: 	02/01/1996	
Autoria: 	ABBOUD, A. C. de S.	
Título: 	Mobilization of phosphorus in organic and conventional farming systems in Southwestern Ontario.	
Ano de publicação: 	1992	
Fonte/Imprenta: 	Nova Scotia: Dalhousie University Halifax, Agosto, 1992.	
Páginas: 	309p.	
Série: 	Tese de Doutorado.	
Idioma: 	Inglês	
Notas: 	Tese de Doutorado.	
Conteúdo: 	A study was conducted to examine the effects of 4 fertilizer treatments (compost, superphosphate, rock phosphate and control) on several variables related to P nutrition in barley. In 1988 the study was conducted on two organic (designated as 01 and 02) and one conventional farm (designated as C1). In 1989 the study was conducted on six farms: the same farms as above with the addition of one organic (designated as 03) and two conventional farms (designated as C2 and C3). In 1990, the study was conducted in the glasshouse, using soils from the six farms studied in 1989. Overall the farms provided a gradient of conditions ranging from long term organic to moderately intensive conventional. In 1988 the following variables were measured when barley reached the he ding stage: soil available P (sodium bicarbonate - P bicarbonate - and anionic resin.P res); soil exchangeable K, Ca, Mg and soil pH; VAM infection and root and soil P-ase activity. The following variables were measured at harvest: percentage of N, P, K, Ca, Mg in barley grain and straw, and grain, straw and weed biomass. In 1989 the variables measured were: soil P bicarb and soil P res (early stage); soil organic and inorganic fractions (heading stage); soil exchangeable K, Ca, Mg, and soil pH (heading stage); percentage of N, P, K, Ca and Mg in plants (early and heading stage); VAM infection (early stage); root and soil P-ase activity (early an heading stage); root length (heading stage) and grain, straw and weeds biomass at harvest. In 1990 the variables...	
Palavras-Chave: 	C; P; Plants.	
Thesagro: 	Carbono; Fósforo; Infecção; Micorriza Vesicular Arbuscular; Planta; Raiz; Solo; Solo Ácido.	
Thesaurus Nal: 	carbon; infection; phosphorus; roots; soil; soil pH; vesicular arbuscular mycorrhizae.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Agrobiologia (CNPAB)	
Exemplares: 	CNPAB - (25344-1) - ADD - TS - -- - 546.712 - A134m - 1992.00058 - DIS