What is the interaction between phosphorus and nitrogen? BY:Cynthia

The interaction between phosphorus and nitrogen refers to the mutual influence between phosphorus (P) and nitrogen (N) in plant absorption and utilization. The supply of phosphorus promotes the absorption and utilization of nitrogen by plants, and the supply of nitrogen also promotes the absorption and utilization of phosphorus by plants.

In alkaline soil, when NH4-N is used as nitrogen fertilizer, the solubility of phosphorus-containing compounds can be increased due to nitrification, thereby increasing the effectiveness of phosphorus in the soil and promoting the absorption and utilization of phosphorus by plants.

The application of nitrogen fertilizer often promotes the absorption and utilization of phosphorus by plants, because nitrogen metabolism, nitrate reduction, ammonia assimilation and protein synthesis processes all require phosphorus-containing compounds. Three types of nitrate reductase (NR) have been isolated from plants, namely reduced nicotinamide adenine dinucleotide-NR (NADH-NR); reduced nicotinamide adenine dinucleotide phosphate-NR (NADPH-NR) and NAD (P) H-NR. The difference between the three types of NR lies in the different electron donors during nitrate reduction: NADH-NR uses NADH as an electron donor during nitrate reduction; NADPH-NR type uses NADPH as an electron donor; and NAD(P)H-NR type can use both NADH and NADPH as electron donors.

Adenosine triphosphate (ATP) is required to form amino acids from NH+4. As for the protein synthesis process, phosphorus is even more indispensable, including the activation of amino acids, the formation of ribonucleic acid (RNA) from deoxyribonucleic acid (DNA), and the formation of protein from RNA. The amount of phosphorus used is also higher in the parts where protein synthesis is more active. For example, the metabolism of nitrogen and phosphorus in plant meristems is very active. The application of nitrogen fertilizer and phosphorus fertilizer appropriately can make plants grow better and promote plants to absorb more nitrogen and phosphorus. Nitrogen and phosphorus have a synergistic effect on plant growth.

Phosphorus promotes nitrogen fixation in leguminous plants. When leguminous plants are deficient in phosphorus, the photosynthetic products obtained by the roots are insufficient, which affects nitrogen fixation in root nodules.

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