Abstract
In this paper, phosphorus fixation in calcareous soils is controlled by means of rosin-coated diammonium phosphate pellets, with several rates of phosphorus release. Four soils from arid regions in the Spanish south-east were chosen and separately treated with one of the following fertilizers: superphosphate (SP) or diammonium phosphate (DAP) coated with 0, 10 or 22% rosin with a dosage of 1000 Kg P/ha. After treatment, the soils were incubated for 8 months, in the course of which samples were taken to evaluate the evolution of P availability by means of the electroultrafiltration (EUF) technique.
The results obtained show that the use of DAP with a 22% coating enables phosphorus fixation in calcareous soils to be controlled. The coating was sufficiently stable to last for the time it takes the crop to grow.
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Diez, J.A., Cartagena, M. & Vallejo, A. Controlling phosphorus fixation in calcareous soils by using coated diammonium phosphate. Fertilizer Research 31, 269–274 (1992). https://doi.org/10.1007/BF01051278
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DOI: https://doi.org/10.1007/BF01051278