PEREGRINA, F. et al. Soil quality of vineyards in the Origin Denomination Rioja: Index of overcrusting risk (FAO-PNUMA), content of organic carbon and rela­tion with soil fertility. []. , 33, 1, pp.338-345. ISSN 0871-018X.

The aim of this study was evaluate in first approximation the soil quality in vineyards of the Origin Denomination Rioja. For this study, soil samples were collected from 0 cm to 30 cm depth in 123 vineyards under conventional tillage, and were determined the organic carbon, pH, C.E, % carbonates, texture, ex­changeables bases and P Olsen. Also was calculated the index of overcrusting risk by FAO-PNUMA. According FAO­PNUMA index, over 50 % of the soils had a medium-high overcrusting risk. The average organic carbon content was inferior to the 1 % necessary level to maintain the quality of the soil. Also organic car­bon was correlated with the clay content and with the P Olsen, indicating the posi­tive effect of the organic matter in the P availability.

: Organic carbon; Soil fertility; Soil quality; Vineyards.

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