25 Pa. Code § 88.185 – Nutrients and soil amendments.

(a) Nutrients and soil amendments in the amounts determined by soil tests shall be applied to the surface soil layer so that it supports the vegetation requirements of § § 88.209—88.218.
(b) Agricultural lime or limestone used for neutralizing soil acidity shall be of sufficient fineness so that a minimum of 95% will pass through a 20-mesh sieve and shall contain sufficient calcium and magnesium to be equivalent to not less than 89% calcium carbonate. An alternate material of equivalent neutralizing effect may be employed.
(c) The use of fly ash and sewage sludge as soil amendments may be approved by the Department if demonstrated to be a suitable soil amendment and meet the requirements of Subpart D, Articles VIII and IX (relating to municipal waste; and residual waste management).

The provisions of this § 88.185 adopted December 19, 1980, 10 Pa.B. 4789, effective July 31, 1982, 12 Pa.B. 2382.