An increase in the rate of applied N to plantings of sweet potato [Ipomoea batatas(L.) Lam.] caused an increase in root N content but did not affect the non-protein N/total N ratio. An increase in the rate of applied K caused an increase in root yield but did not affect root N content nor the non-protein N/total N ratio. Sulfur had no effect on yield or composition of the roots.
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