[Comparative study about the efficiency and P absorption from phosphate fertilizers with Chilean wheat genotypes] | Estudio comparativo de la eficiencia de uso y absorcion de fosforo, a partir de fertilizantes fosforicos, por genotipos chilenos de trigo

anglais. A greenhouse trial was performed in order to evaluate the efficiency of triple superphosphate (TSP) and Bahia Inglesa phosphoric rock (RBI) using the dilution isotopic method. Agronomic parameters, such as dry matter yield, absorbed P, and physiological efficiency of P were determined. At the same time, the isotopic parameters were determined considering the percentage of P in the plant derived from the TSP (%PddF), the percentage of P in the plant derived from the soil (%PddS), the percentage of P in the plant derived from RBI (%PddR), the fertilizers use efficiency and the agronomic evaluation. Significant differences were obtained between the wheat genotypes with the different parameters evaluated, this means that the genetic characteristics influenced the behavior of them. The efficiency of RBI was lower in comparison with TSP. According to efficiency, six genotypes were classified as less efficient and non-efficient

espagnol; castillan. Se realizo un ensayo de invernadero tendiente a evaluar la eficiencia de superfosfato triple (SFT) y roca fosforica de Bahia Inglesa (RBI) utilizando el metodo de dilucion isotopica. Se determinaron los parametros agronomicos como materia seca total (MST), P absorbido y eficiencia fisiologica de uso de P (EFU P). Paralelamente, se determinaron los parametros isotopicos considerando el porcentaje de P en la planta proveniente del SFT (%PddF), el porcentaje de P en la planta proveniente del suelo (%PddS), el porcentaje de P en la planta proveniente de la RBI (%PddR) y la evaluacion agronomica de los mismos (EA). Se encontraron diferencias significativas entre los genotipos de trigo para los parametros evaluados, lo que se atribuye a las caracteristicas geneticas inherentes a cada uno de ellos. La eficiencia de la RBI, en terminos generales, fue baja comparativamente con el SFT y de acuerdo con la clasificacion de eficiencia, seis genotipos se clasificaron entre poco eficientes y no eficientes