Bull. Spec. CORESTA Congress, Harare 1994, p. 14, A 5
The effect of potassium nitrate and potassium sulphate on flue-cured tobacco
Tobacco Research Board, Harare, Zimbabwe.
Two field trials compared KNO3 and K2SO4 at preplanting rates of 40, 70 and 110 kg K2O/ha with an additional 20 kg K2O/ha as KCl in a mixture of 33 kg N, 93,5 kg P2O5 and 4 kg fertilizer borate/ha. None or side-dressings of NH4NO3, NH4NO3+K2SO4,...