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O Encontro decorreu na Universidade do Algarve.
Poster apresentado no 6th International Phosphorus Workshop, que decorreu em Sevilha de 27 de Setembro a 1 de Outubro de 2010.
Low phosphate (P) availability is one of the major problems in most Ferralsols from Angola, due to
the strong ability of these soils to adsorb P, thereby limiting its bioavailability for crop production
(Ucuassapi, 2006). Application of biochar as soil amendment, along with superphosphate and rock
phosphate fertilizers may be useful in increasing supply of available P. However, appropriate P
management strategies may require information on the fate of biochar and applied P fertilizers in the
soil as well as on their interaction with soil colloidal constituents. Therefore, information on soil P
availability using different methods, and P forms (inorganic and organic) by Hedley modified
fractionation procedure (Tiessen and Moir, 1993), early plant growth performance and P content in
plant after biochar amendment along with different rates of P fertilizers, is crucial for making
appropriate fertilizer and biochar recommendations for crops.
Phosphorus (P) deficiency is the major constraint to crop production in most tropical
soils (Sahrawat et al., 2001). In Angola, such constraint (i.e, low concentration and low P
solubility) has also been reported to limit crop production in many agricultural soils
(Ucuassapi, 2006). These soils may require application of inorganic P through soluble and
relatively reactive phosphate rock sources, and lime (Dobermann et al., 2002; Murphy,
2007). However, appropriate P management strategies may require information on the
fate of applied P and its interaction with the colloidal constituents. Therefore, information
on the different P fractions (inorganic and organic) after the application of different rates
of P fertilizers and lime, as fractionated sequentially by the Hedley modified procedure
(Tiessen and Moir, 1993) is crucial for making appropriate fertilizer and lime rate
recommendations for crops (Islam et al., 2010).
