. Report of the director . color distribution on the cured leaf, but not on the sweated high humidity offered ideal conditions for the growth ofthe organisms that cause pole sweat. Potash and Tobacco Two important roles that potassium performs in tobacco havebeen demonstrated in long-continued studies of this element, whichhave been concluded recently. In the cured leaves it promotes .the Report of the Director 483 incandescent type of combustion required for cigars, and also theintake of moisture that makes the leaf soft and suitable forhandling. In comparison with other crops,
. Report of the director . color distribution on the cured leaf, but not on the sweated high humidity offered ideal conditions for the growth ofthe organisms that cause pole sweat. Potash and Tobacco Two important roles that potassium performs in tobacco havebeen demonstrated in long-continued studies of this element, whichhave been concluded recently. In the cured leaves it promotes .the Report of the Director 483 incandescent type of combustion required for cigars, and also theintake of moisture that makes the leaf soft and suitable forhandling. In comparison with other crops, tobacco feeds heavily on potas-sium. The plant draws on this element in large amounts at certainperiods. In the fifth and seventh weeks of growth, slightly morethan three-fifths of the total potash are absorbed. Absorption isgreatest the fifth week, when almost half of the total is maximum absorption of potash takes place in the same periodthat the highest assimilation of nitrogen and the greatest Figure 42. Potash deficiency. Large plant on right had all nutrients sup-plied. Small plant had all nutrients except potash. Plants of same age. Tobacco that has not had enough potash for its physiologicalneeds shows characteristic starvation symptoms, the most prom-inent of which are yellow mottling, dead specks, hobbly surface,and downward incurving of margins and tips. Reduction infertilizer potash affects the quality more than the quantity of thecrop. Only at the lowest rate (40 pounds to the acre) was therea reduction in yield and this was not apparent on these plots untilafter the first year. In quality the leaves with insufficient potashwere quite inferior, being harsh, dry, short, and non-elastic. All of the six carriers tested seemed to be satisfactory for usein a tobacco fertilizer mixture. Sulfate, carbonate, and nitrate of 484 Connecticut Experiment Station Bulletin 337 potash, and sulfate of potash-magnesia, ground tobacco stems andcottonhull as
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