The relationship between the total potassium content of tobacco leaves and the exchangeable or assimilable potassium content of the soil on which the plants are grown
Chouteau, J.; Renier, A.
Ann. Inst. exp. Tabac Bergerac 3: 227-38
Experiments in 1956 and 1957 showed that: (1) the K content of mature leaves is an inverse function of the height of their point of insertion on the stem; (2) the-K content of the lower leaves falls between the date of priming and final harvesting; (3) the K content of the leaf is strongly influenced by the exchangeable K content of the soil; (4) the lower the soil K, the greater is the increase in leaf K resulting from K fertilization; (5) in soils containing more than 0.2 atom percent of exchangeable K2O K manuring is unlikely to affect leaf characters and should be limited to the amounts removed by the crop; (6) in soils containing less than 0.2 atom percent of exchangeable K2O the lower the soil K, the heavier should K manuring be.