Abstract
Four soybean cultivars (FT 2, IAC 11, IAC 17 and IAC 18) were grown in nutrient solutions with either adequate or deficient K levels (1.82 and 0.5 mmol L-1) and harvested at 20, 40 and 60 days after plant emergence (DAPE) to study the K utilization efficiency (KUE) and utilization index as affected by plant age. FT 2 showed the highest KUE in deficient solutions at 40 DAPE (immediately before flowering), and the lowest KUE at 60 DAPE. In K-sufficient solutions IAC 11 showed the highest KUE and IAC 18 the lowest, at 60 DAPE. The utilization index was helpful in determining cultivar plasticity to adapt to K deficiency. The highest plasticity was observed for FT 2 at 40 DAPE (up to flowering) and for IAC 18 at 60 DAPE. In interpreting the utilization efficiency and utilization index, it proved to be important to compare plants at the same growth stage.
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