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Effect of the addition of granitic powder to an acidic soil from Galicia (NW Spain) in comparison with lime

High amounts of granitic powders are produced in the granite industry in Galicia (NW Spain), whose accumulation could pose environmental threats, at least locally. Due to its natural alkalinity, the powder could be used to correct the acidity of soils or mining residues, where it would act at the same time as a source of plant nutrients. A greenhouse experiment was conducted to test the growth of Italian ryegrass on an acid soil amended with different rates of granitic powder (2.5, 5 and 10 %). Soil amended with lime or with lime in combination with P–K fertilizer, and the granitic powder alone, was used for comparison, with the unamended soil as ...