Data/hora: 23/09/2024 23:10:00

Biblioteca(s): 	Embrapa Agroindústria Tropical; Embrapa Amazônia Ocidental.	
Data corrente: 	05/07/1993	
Data da última atualização: 	05/07/1993	
Autoria: 	ASHER, C. J.; OZANNE, P. G.; LONERAGAN, J. F.	
Título: 	A method for controlling the ionic environment of plant roots.	
Ano de publicação: 	1956	
Fonte/Imprenta: 	Soil Science, v.100, n.3, p.149-156, Sep. 1956.	
Idioma: 	Inglês	
Conteúdo: 	In experiments on ion uptake by plants, the root environment should be precisely defined. Although this cannot be done in the soil, it is possible in solution culture if adequate provision is made for replenishment of the solution in contact with the roots. A solution culture method is described in which nutrient solution is continuously circulated through 32 pots at rates up to 1300 liters/pot/day. Stirring of solution in the pots is enhanced by aeratiuon. Nutrient are added to the solution through a drip-dfeed system at a rate aprproximately equal to the rate of uptake by the plants. Temperature and pH of the solution are controlled. A total volume of 275 liters of solution acts as a buffer against change in solution composition. When necessary, this volume can be increased 10-fold by means of a large auxiliary tank. Using six units of the apparatus, a single operator can simultaneously control the root environment in 192 pots. The method has been used successfully in experiments with a large number of species growing at a wide range of nutrient ion concentations. Satisfactory control of solution composition has been maintained at concentrations as low as 10(elevado a)-8 M.	
Palavras-Chave: 	Concentração; Desenvolvimento ionico; Nutrientes; Planta - raiz - desenvolvimento ionico; Raiz - nutrientes - concentracao.	
Thesagro: 	Planta; Raiz.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Agroindústria Tropical (CNPAT)	
Exemplares: 	CNPAT - (612-1) - EMB - SP - -- - SP 00807 -  - 91.00807 - DIS
CPAA - (31107-1) - ADD - SP - PP - S4109 -  - S4109 - DIS