In the carrot field experiment, different doses of polyglutamic acid were used to conduct comparative experiments to study the effect of polyglutamic acid on carrot yield and economic benefits.
The results showed that compared with conventional fertilization, the total yield increased by 3.03%, 7.38%, and 12.36% after applying 75 mL, 150 mL, and 300 mL of polyglutamic acid in a 100-square-meter test field. Polyglutamic acid is a suitable fertilizer synergist, but it cannot replace compound fertilizer.
Polyglutamic acid is a high-molecular polymer. Because there are a large number of carboxyl groups on its side chain, polyglutamic acid has the functions of absorbing water and moisturizing, regulating plant growth, etc., and can improve the utilization rate of fertilizers.
Polyglutamic acid can reduce the use of chemical fertilizers by 20%, and is a green and environmentally friendly new fertilizer synergist.
Field Trial
1. Test Time
According to the fertilization method of carrot topdressing, this experiment was carried out 3 times of topdressing.
- The first top dressing is 20-25 days after the emergence of carrots, and after the carrots grow 3-4 true leaves.
- The second top dressing is carried out after the carrot seedlings are established.
- The third top dressing is during the expansion period of the carrot root system.
2. Group of Experiments
First top dressing:
- Group 1: Only Water
- Group 2: Seaweed Fertilizer 1.2KG
- Group 3: Liquid Polyglutamic Acid 50ml
- Group 4: Liquid Polyglutamic Acid 25ml + Seaweed Fertilizer 1.2kg
- Group 5: Liquid Polyglutamic Acid 25ml + Seaweed Fertilizer 1.2kg
Second top dressing:
- Group 1: Only Water
- Group 2: High Potassium Compound Fertilizer 1.5KG
- Group 3: Liquid Polyglutamic Acid 50ml
- Group 4: Liquid Polyglutamic Acid 25ml + High Potassium Compound Fertilizer 1.5KG
- Group 5: Liquid Polyglutamic Acid 50ml + High Potassium Compound Fertilizer 1.5KG
Third top dressing
Same as the second.
Table 1 Growth of Carrots in Different Treatment Groups | ||||
Group | Root Length (cm) | Root Circumference (cm) | Single Carrot Weight (g) | Total Carrots Output in 100m2 (kg) |
Group 1 | 22.5 | 7.8 | 91.2 | 580 |
Group 2 | 24.1 | 9.2 | 132.23 | 866.7 |
Group 3 | 23.3 | 8.0 | 98.5 | 633.48 |
Group 4 | 24.6 | 9.3 | 136.9 | 893.0 |
Group 5 | 25.3 | 9.5 | 142.1 | 930.7 |
Conclusion
By applying different doses of polyglutamic acid and compound fertilizers, field topdressing experiments were carried out on carrots, and the following conclusions can be drawn.
Polyglutamic acid can promote the growth of carrots, but it cannot replace compound fertilizers and is a suitable fertilizer synergist.