MANOLOVA V, KOSTADINOVA S, MANOLOV I. ECONOMIC EFFICIENCY OF FERTILIZATION AND ITS RESIDUAL-EFFECT DURING CONVERSION PERIOD TO ORGANIC FIELD CROP PRODUCTION. BJAS [Internet]. 2015 Oct. 30 [cited 2026 Nov. 4];21(5):1022-6. Available from: https://agriacad.eu/ojs/index.php/bjas/article/view/5500