Efectos en el Sistema Suelo-Planta Después de Tres Años de Aplicación de Purín de Cerdo como Fertilizante en un Cultivo de Brócoli (Brassica oleracea L.)

Abstract

Effects in the soil-plant system after three years of application of pig slurry as fertilizer in a broccoli (Brassica oleracea L.) crop ABSTRACT This paper is aimed to determine the dose of correct application of pig slurry as fertilizer minimizing its polluting effects. It was experienced with a horticultural crop, broccoli, representative of the study area. The experience lasted three years and was carried out in four plots (630 m 2) with different applications of pig slurry: the treatments were: without slurry and 4,86 L/m 2 ; 11,05 L/m 2 and 14,86 L/m 2 of slurry application namely: control, B, C and D, respectively. After the experience, the soil presented important increments in N, P, K and organic carbon, especially after successive applications and high doses. It was also observed an slight increase of the pH and a decreasing of electric conductivity; the oligoelements increased without exceeding the limits ruled by the legislation. The plant tissue increased in N, P and K after successive slurry applications. The same happened with the oligoelements and NO 3-; however, these values were in the normal range, not surpassing the limit imposed by law. The broccoli production increased when increased the slurry doses in successive applications, surpassing the stocking of production of the Valley of the Guadalentín. Palabras claves: Purín de cerdo, características físico-químicas suelo, brócoli, fertilizante.