Kemmler, G. Fertilizer experiments the need for long term trials/ G. Kemmler and H. Malicornet - Bern: International Potash Institute, 1976 - 34 p.; 21 cm. - International potash institute research topics no. 1 . Subjects--Topical Terms: Fertilizers--ApplicationCropsSoil fertility Dewey Class. No.: 631.88