Abstract
The nitrogen content (Nc) — potassium content (Kc) relationship in leaves was classified into two types; type I, in which Kc decreases with the decrease of Nc, and type II, in which Kc remains constant against the decrease of Nc. To understand the effect of K nutrition on translocation and carbon-nitrogen (C-N) metabolism in leaves of type I and type II plant, wheat and soybean (type I), and sunflower (type II) were grown in K-sufficient and K-deficient soils in pots, and the main physiological functions were investigated. The translocation of photosynthesized 14C and C-N metabolic balance in leaves were less affected by K deficiency in type I plants, while in type II plants, C-N metabolic balance in leaves was disturbed and the translocation of photosynthesized 14C was reduced by K deficiency, which caused a decrease in dry matter production.
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