English English N-P-K ratios NPK ratio NPK http://en.wikipedia.org/wiki/NPK_rating nu este chiar aşa de simplu NPK Rating NPK rating A little more on the NPK rating English English NPK ratio English NPK English NPK http://en.wikipedia.org/wiki/NPK_rating English NPK N-P-K http://en.wikipedia.org/wiki/NPK_rating English NPK rating