Field studies of cadmium in potatoes (Solanum tuberosum L.), 3. Response of cv. Russet Burbank to sources of banded potassium
1994
Sparrow, L.A. | Johnstone, J. (Tasmanian Dept. of Primary Industry and Fisheries, Kings Meadows (Australia). Mount Pleasant Lab.) | Salardini, A.A. (Tasmanian Dept. of Primary Industry and Fisheries, Devonport (Australia). Stoney Rise Centre)
Six field experiments were conducted where Russet Burbank potatoes were grown with banded fertilizer consisting of diammonium phosphate (DAP) and either potassium sulfate (K2SO4) or potassium chloride (KCl). At each site, rates of N, P and K were matched as closely as possible for each K fertilizer treatment. At 4 of the 6 sites potatoes grown with K2SO4 had tuber and petiole Cd concentrations of 20-30 percent lower than did potatoes grown with KCl. The use of K2SO4 instead of KCl appears to offer considerable promise as a means of decreasing tuber Cd uptake. Sulfate ions presumably promote increased soil adsorption of soil and-or fertilizer Cd compared with chloride ions, and so decrease Cd availability. The lack of difference in tuber and petiole Cd between K sources at 2 sites was attributed to either leaching, chloride in irrigation water, or at 1 site to a higher than desired rate of NPK fertilizer with the sulfate treatment. Any one of these may have offset decreases in Cd uptake due to the presence of sulfate ions.
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