2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM

Paper No. 23
Presentation Time: 8:00 AM-6:00 PM

Assesment of Phosphorous Recovery Efficiency from Local and Concentrated Souced Ferilizer by Eucalypts {Eucalyptus Grandis}

ADEYEYE, Awodun Moses, BARROS, Nairam Felix, NOVAIS, Roberto Ferreira and DANTERS, Salete Vasconcelos, Departmento de Solos, Universidade Federal de Vicosa, Centro de Ciencias agrarias. Departmento de Ciencias de solos, Ufv, Vicosa. M. G. Brazil, Vicosa. M.G, +55, Brazil, m_awodun@yahoo.com

Attempts were made to validate the recovery efficiency of phosphate rocks {Araxa and the concentrated Arafertil} in planting Eucalyptus grandis in relation to triple superphosphate. Two experiments were carried out at Carbonita {longitude 17 0 44 1 and latitude 430141} and Bom Despacho { longitude 190351 and latitude450171 } in the Cerrado area of Minas Gerais State, Brazil. Application of the natural phosphate Araxa {P2o5 24% and Ca 25%} was at 500, 1000, 2000, and 4000kg/ha and Arafertil {33% -P2o5 and 33% Ca} was at 1000kg/ha. Also, triple superphosphate {45% -P2o5 and 13% Ca } was applied at 250, 500, 1000 and 2000kg/ha.

It was observed that, in both areas, the application of the natural sources (Araxa and Arafertil) gave similar results in volume, height , and production of dry matter. This is possibly due to best distribution of rains during the assessment period and, probably, limitation of potassium in the soil. The major plant P utilization estimate at Carbonita indicated minor availability of phosphorous in soils with reflection to critical concentration of nutrients in the above-ground portion of the plants. Plant phosphorous recovery from Araxa rock was similar to that from triple superphosphate, varying between 3-11 %.