Peanut stems and leaves contain only 0.2% to 0.35% phosphorus (P2O5) (low at the late seedling stage), while the seed kernels are as high as 0.4% to 0.5%. The typical symptoms of phosphorus deficiency in peanuts are dark green leaves, fine purple stalks, thin plants, weak root systems, few root nodules, few flowers, small fruit, and low oil content. Phosphorus absorption and distribution of peanuts were basically consistent with nitrogen (Table), but phosphorus and nutrients reached the maximum rate of nitrogen accumulation time earlier than nitrogen, the peak phosphorus accumulation rate of the whole plant was about 10 days earlier than nitrogen, about 50 days after sowing ( Phosphorous uptake peaked at the beginning of the crusting stage. Phosphorus absorbed during the crusting stage accounted for 60% to 70% of the total lifetime accumulation. Phosphorus absorbed during the lifetime of peanuts mainly accumulates in the stems and leaves (leaves slightly higher than the stems). After the fruit is full, phosphorus is gradually transferred to the genitalia. At the time of harvest, about 70% of the total phosphorus in the whole plant is distributed in the pods. (Among them, more than 90% of the phosphorus is distributed in the kernels), with 5% of leaves and 25% of stems.
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