The amount of potassium (K2O) in peanut plants is second only to nitrogen. In contrast to nitrogen and phosphorus, potassium is higher in the vegetative organs than in the genital organs. Stems (0.5% to 2%) are higher than leaves (0.5% to 1.3%). The seedling stage is higher than the mature stage, and the contents in the pods are very low. The child kernel (about 0.3%) is lower than the shell (about 0.4%) (table). When the peanut lacks potassium, the stalk is weak and easy to fall. The edge of the old leaf begins to yellow and gradually expands inwards, leaving the veins chlorogenic. The peak of potassium uptake was about 45 days after sowing (flowering phase). Potassium no longer accumulates after entering tillering stage. Potassium accumulation in stems and leaves begins to drop significantly and it is redistributed to the reproductive body (table). Compared with nitrogen and phosphorus, the distribution rate of potassium in the reproductive organs is low, and it only accounts for about 50% of the whole plant when mature. The ratio of potassium in stems was high during the whole growth period of peanuts, and it basically did not decrease after scabs.
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