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La escala de pH va de 1 a 14, siendo el pH 7 la disolución neutra. Si el pH es inferior a 7 la disolución es en su conjunto ácida, tanto más ácida cuanto menor sea el valor del pH. En cambio, si el pH es superior a 7, la disolución entra a denominarse básica, y será tanto más básica cuanto mayor sea su pH, hasta llegar al límite de 14.

Clasificación del pH

Según la escala de pH en la que se encuentre el suelo, los elementos nutritivos pueden estar o no en condiciones de disponibilidad por la planta, e incluso afectar a su grado de toxicidad.

Para exponer de forma sencilla la incidencia del pH en la definición del suelo y su incidencia en los nutrientes, realizamos la siguiente clasificación:

  • Cuando el pH es inferior a 4,5, decimos que es extremadamente ácido y las condiciones del suelo son muy desfavorables.
  • De 4,5 a 5 es muy fuertemente ácido y existe una posible toxicidad por efecto del aluminio.
  • De 5,1 a 5,5 es fuertemente ácido y suele ir acompañado de deficiencia de Ca, K, Mg, N, P, S, Mo… exceso de Cu, Fe, Mn, Zn, Co y la actividad bacteriana en el suelo es escasa.
  • De 5,6 a 6 es medianamente ácido y es un suelo adecuado para la mayoría de los cultivos.
  • De 6,1 a 6,6 es ligeramente ácido y es donde se encuentra la disponibilidad máxima de nutrientes.
  • De 6,6 a 7,3 es neutro y los efectos tóxicos de los elementos son mínimos.
  • De 7,4 a 7,8 se denomina medianamente básico y por lo general hay carbonato cálcico en el suelo.
  • De 7,9 a 8,4 es básico y disminuye la disponibilidad de P y Bo, además de una deficiencia creciente de Cu, Fe, Mn, Zn. Co. Aparece la clorosis férrica.
  • De 8,5 a 9 es ligeramente alcalino y aparecen los problemas mayores de clorosis férrica.
  • De 9,1 a 10 es alcalino y existe la presencia de carbonato sódico en grandes cantidades.
  • Por encima 10 es fuertemente alcalino y conlleva un elevado porcentaje de Na intercambiable. La actividad microbiana escasa y hay poca disponibilidad de micronutrientes, excepto del Mo.

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