Nitrogen is the nutrient most absorbed by peanuts. Seed nitrogen content of 4% to 5%, leaf nitrogen content of seedlings reached 4% to 5%, then gradually decreased until the end of fertility is still more than 2%; stem nitrogen content from seedlings by 3% to 4% drop To mature period of 1% to 1.5%. The symptoms of nitrogen deficiency in peanuts were leaf yellow, stem red, plant dwarf, small leaves, and few branches. The accumulation of nitrogen in peanuts during their lifetime was in line with the S-shaped growth curve (table). The peak rate of nitrogen absorption and accumulation in vegetative organs was about 45 days after sowing (early stage of scarring), and the maximum accumulation amount was reached after about 80 days after sowing. It decreased to the reproductive body. The rate of absorption and accumulation was the fastest around the 60th day after sowing (middle scab). The nitrogen accumulated during the pod stage accounted for about 60% of the total amount accumulated during the whole growth period. It was the peak period of nitrogen absorption of peanuts; About 90 days after sowing (pre-harvest fruit), the accumulation of absorption is fastest, until the harvest has been increasing. The nitrogen absorbed during the lifetime of peanuts mainly accumulates in the stems and leaves before the scarring (the leaves are significantly higher than the stems), and the nitrogen gradually transfers to the reproductive body after the fruit is full, and 70% to 80% of the nitrogen is distributed to the whole plant by the time of harvest. In the follicles, the leaves account for 10% and the stems account for about 15%. The peak of nitrogen fixation of Peanut Rhizobium was consistent with the peak period of nitrogen requirement. Nitrogen fixation was the ratio of nitrogen supply of peanuts to the total nitrogen requirement of peanut plants (N supply rate of root nodules), which was greatly influenced by soil nitrogen level and nitrogen application rate. The nitrogen supply rate of root nodule can reach more than 90% in barren soil without nitrogen application, while the nitrogen supply rate of root nodule is generally 40% - 60% in soil with medium fertility and moderate nitrogen application rate. Increase and decrease.
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