Abstract

PEREZ, María J; MORILLO, Maryelin  and  MALPICA, Lesly. Efficiency of four Centrosema species to use phosphorus from Riecito phosphate rock in soils with different phosphorus sorption capacity. Zootecnia Trop. [online]. 2009, vol.27, n.3, pp.239-247. ISSN 0798-7269.

The ability of plants to absorb P is variable among plant species. The soil P sorption capacity (PSC) may affect the ability of plants to dissolve and use P from phosphate rocks (PR). The objectives of this study were to compare the ability of four Centrosema species to dissolve and use P from Riecito phosphate rock (RPR), and to study the influence of soil P sorption capacity on Centrosema efficiency to dissolve and use P from RPR. Three acid P deficient soils were used, identified as Espino, Iguana, and Pao. The soil P sorption capacity was determined using the Langmuir isotherms model. The efficiency of Centrosema brasilianum, Centrosema molle, Centrosema macrocarpum, and Centrosema rotundifolium to dissolve and use P from RPR were compared in a greenhouse experiment, using a soil low in P sorption capacity. The P treatments were 0, 15, 30, 45, and 60 mg/kg of P from RPR. After choosing the most efficient Centrosema species, it was evaluated in three soils with different P sorption capacity and three P treatments (0, 50, and 75 mg/kg) from RFR. Centrosema brasilianum showed higher efficiency to use P from RPR in the soil with low P sorption capacity. As soil P sorption capacity increased, the dissolution of RPR also increased. However, plant growth and P absorption were not enhanced.

Keywords : Centrosema; P adsorption isotherms; phosphate rock; soil P sorption capacity; soil available P.

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