Polyglutamic acid (poly-γ-glutamic acid, referred to as γ-PGA) is a water-soluble polyamino acid produced by microbial fermentation in nature. Its structure is that the glutamic acid unit passes α-amino and γ – A high molecular weight polymer in which carboxyl groups form peptide bonds. Due to its excellent performance in agriculture, it has attracted more and more attention in recent years. Then let’s learn about the application of polyglutamic acid (γ-PGA) in agriculture.
1. Application of water-soluble fertilizer
It can be used as a fertilizer auxiliary nutrient to add an appropriate amount of polyglutamic acid to different types of water-soluble fertilizers, which can be used to promote root growth and improve crop stress resistance.
2. Application of new fertilizers
As a nutritional synergist, it is widely used in granulation equipment such as towers, ammoniation, spraying, extrusion, and drums. The fertilizer produced has the functions of drought resistance, water retention, improvement of fertilizer efficiency, safe degradation, and soil improvement.
3. Application of phosphorus compound fertilizer
As a peptide synergist added to urea, phosphate fertilizer, and potassium fertilizer, it can improve the utilization rate of fertilizer, reduce chemical residues, and reduce soil pollution.
4. Application in soil improvement
Polyglutamic acid use alone as soil improver: it can not only improve acidified soil, but also improve alkaline soil, and can also be used as a water retention agent to improve soil in arid areas.
5. Application in seed dressing
For field crops such as wheat, corn, rice, etc., it can be used as a seed dressing agent, generally diluted 5-10 times. Mix with seeds and then sown, which can increase the germination rate and survival rate of seeds.
For the economic effect of fruits and vegetables, it can be used as a seedling nutrient solution. Dilute 200-400 times to dip the roots or spray on the seedbed or seedling tray, which can promote the growth and development of the root system of the seedlings, improve the resistance of the seedlings, and ensure the vigorous growth of the seedlings.
Polyglutamic acid can increase the utilization rate of nitrogen fertilizer by 50-60%, increase the utilization rate of phosphorus fertilizer by more than 5%, increase the utilization rate of potassium fertilizer by 15-20% on average, increase the average yield of crops by 10-25%, and increase the yield of rhizome crops by more than 60%. It can save 10-20% of chemical fertilizers per mu.
What is the mechanism of action of polyglutamic acid (γ-PGA) as a plant production-enhancing nutrient?
1. Polyglutamic acid has super hydrophilicity and water retention capacity
Polyglutamic acid has the ability to absorb water and keep moisture. When it is flooded in the soil, it will form a film on the surface of the root hairs of the plant. It not only has the function of protecting the root hairs, but also is the best delivery of nutrients and water in the soil in close contact with the root hairs. The platform can effectively improve the dissolution, storage, transportation and absorption of fertilizers.
2. Polyglutamic acid (γ-PGA) can improve soil physical and chemical properties
Prevent the precipitation of sulfate, phosphate, oxalate and metal elements, so that crops can more effectively absorb phosphorus, calcium, magnesium and trace elements in the soil. Promote crop root development and enhance disease resistance.
3. Polyglutamic acid (γ-PGA) can balance soil pH
It has excellent buffering capacity for acid and alkali, which can effectively balance the pH value of the soil and avoid the acidic soil caused by long-term use of chemical fertilizers. In addition, it has a good improvement effect on saline and alkaline soil caused by seawater intrusion.
4. Polyglutamic acid (γ-PGA) can combine and precipitate toxic heavy metals
It has excellent chelating effect on toxic heavy metals such as Pb+2, Cd+2, Cr+3, Al+3, As+4, etc.
5. Polyglutamic acid (γ-PGA) can enhance plant resistance to disease and adversity
Integrating plant nutrients, water-active components in the soil, can enhance resistance to symptoms caused by soil-borne plant pathogens.
6. Promote production increase
It can rapidly increase the production of agricultural products such as tea, melons and fruits, and vegetables, and the production increase can reach 10-20%.
