Abstract
AbstractVarious aspects of the P cycle in four and seven year old soils from the Meirama lignite mine (northwest Spain) were studied. With increasing soil age, The organic P (Po) content increased in parallel with the organic matter content. the observed increase in secondary inorganic P (Bic—Pi + NaOH‐Pi + us‐NaOH Pi) is related to the increase in the retention capacity for P with soil age. the observed increase in the HCl‐P fraction can be attributed to a gradual dissolution of the non‐extractable forms of P produced from fertilizers added in the course of spoil management. Both the C:Po ratio and phosphatase activity also increased with soil age, suggesting that biochemical mineralization processes are taking place and indicating a need for the hydrolysis of phosphate esters to ensure an adequate phosphorus supply to plants. All these findings suggest that in the long term plants May, suffer a pronounced P deficiency.
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