www.iuss.org/.../1974_10_kothpecc__10th_congress_ii_compressed.pdf
Extraction of potassium from twenty one soils with a cation-exchange resin ..... M.V.Gama und M.L.B.Sousa. Extraktion von ..... Department of Soil Science and Plant Nutrition, Institute ...... Proceeding from this, humic acids are related to a special chalss ...... Cpencer K., Preney J.R. Australian Journal of Agricultural Research.
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