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Use of basalt rock dust in comparison to dolomite to adjust the pH of a pine bark compost substrate and its response in nutrient availability
Pine bark compost substrate (SCCP) generally has a pH value below the range appropriate for container grown plants (5.3 to 6.5). In Misiones (Argentina), there are mining operations where the main residue is basaltic rock dust (PRB). The objective of this work was to evaluate the capability of PRB t...
Pine bark compost substrate (SCCP) generally has a pH value below the range appropriate for container grown plants (5.3 to 6.5). In Misiones (Argentina), there are mining operations where the main residue is basaltic rock dust (PRB). The objective of this work was to evaluate the capability of PRB to adjust the pH of the SCCP in comparison to dolomite and to assess its response in the concentration of nutrients. Seven treatments were arranged: SCCP, SCCP with 1, 2 or 3 g L-1 doses of dolomite and SCCP with 0.74, 1.48 or 2.22 g L-1 of PRB. The PRB and dolomite were analysed for CaO, MgO percentage and size particles (10, 20 and 60 mesh) in order to calculate the relative power of total neutralization (PRNT). The pH and electrical conductivity (EC) for each treatment was measured at the beginning and every seven days. In addition, soluble nutrients were measured at the end of the trial. Both correctors presented high PRNT values. The suitable PRB doses to adjust the pH value were 0.74 and 1.48 g L-1. The availability of calcium, magnesium and potassium increased, and that of phosphorus, zinc, manganese, copper and iron decreased with higher pH.
