Which plant growth regulators make trees grow faster?
The most effective growth regulators for accelerating tree growth include GA3, cytokinins, and sodium nitrophenolates.
The growth rate of trees is influenced by their own genes, environmental conditions, and growth regulators. Under the premise of reasonable fertilization and controlled light, the scientific use of plant growth regulators can effectively accelerate the growth process of trees, but the appropriate type must be selected based on the specific characteristics of the tree species.
1. Gibberellic Acid (GA3)
Gibberellic Acid is one of the most commonly used growth regulators. It directly increases the extension rate of the trunk and branches by stimulating cell elongation. Spraying leaves with a 50-100 ppm gibberellic acid solution on fruit trees such as citrus and grapes can increase new shoot growth by 20%-35% (2023 experimental data).
2. Cytokinins (such as 6-BA)
These regulators enhance cell division activity, and are particularly suitable for lateral bud germination and increasing branch and leaf density. Spraying poplar seedlings with a 0.1% concentration of 6-BA can increase the number of lateral branches by more than three times after 15 days. However, excessive use can lead to overly dense foliage, affecting light penetration.
3. Sodium Nitrophenolates: Sodium nitrophenolates has both growth-promoting and stress-resistance functions, accelerating nutrient accumulation by enhancing photosynthetic efficiency. Spraying pine seedlings with a 1.8% aqueous solution diluted 6000 times, combined with nitrogen fertilizer application, can increase annual height growth by 40%.
After understanding the principles, two points should be noted: First, the regulator should be used simultaneously with the base fertilizer. For example, applying phosphorus and potassium fertilizer before and after applying gibberellin can prevent excessive vegetative growth. Second, the optimal application period is from bud break to rapid growth; spraying during dormancy may inhibit growth.
In northern regions, when planting deciduous trees, it is recommended to spray three times at intervals from late April to mid-June, while for evergreen trees in the south, this can be extended to September.
A practical reference ratio is: 10 grams of gibberellin + 30 grams of potassium dihydrogen phosphate diluted in 15 kg of water, focusing on spraying tender shoots and the undersides of leaves. If abnormalities such as leaf curling are observed, immediately rinse with clean water and apply calcium and magnesium fertilizer to alleviate the problem.
Experiments show that the combined use of regulators and microbial agents is more effective. For example, applying Bacillus subtilis as a root drench three days after spraying Sodium Nitrophenolates can improve the root system's nutrient absorption rate, resulting in an annual thickening of fast-growing locust trees that is 1.5 times that of conventional management.
The growth rate of trees is influenced by their own genes, environmental conditions, and growth regulators. Under the premise of reasonable fertilization and controlled light, the scientific use of plant growth regulators can effectively accelerate the growth process of trees, but the appropriate type must be selected based on the specific characteristics of the tree species.
1. Gibberellic Acid (GA3)
Gibberellic Acid is one of the most commonly used growth regulators. It directly increases the extension rate of the trunk and branches by stimulating cell elongation. Spraying leaves with a 50-100 ppm gibberellic acid solution on fruit trees such as citrus and grapes can increase new shoot growth by 20%-35% (2023 experimental data).
2. Cytokinins (such as 6-BA)
These regulators enhance cell division activity, and are particularly suitable for lateral bud germination and increasing branch and leaf density. Spraying poplar seedlings with a 0.1% concentration of 6-BA can increase the number of lateral branches by more than three times after 15 days. However, excessive use can lead to overly dense foliage, affecting light penetration.
3. Sodium Nitrophenolates: Sodium nitrophenolates has both growth-promoting and stress-resistance functions, accelerating nutrient accumulation by enhancing photosynthetic efficiency. Spraying pine seedlings with a 1.8% aqueous solution diluted 6000 times, combined with nitrogen fertilizer application, can increase annual height growth by 40%.
After understanding the principles, two points should be noted: First, the regulator should be used simultaneously with the base fertilizer. For example, applying phosphorus and potassium fertilizer before and after applying gibberellin can prevent excessive vegetative growth. Second, the optimal application period is from bud break to rapid growth; spraying during dormancy may inhibit growth.
In northern regions, when planting deciduous trees, it is recommended to spray three times at intervals from late April to mid-June, while for evergreen trees in the south, this can be extended to September.
A practical reference ratio is: 10 grams of gibberellin + 30 grams of potassium dihydrogen phosphate diluted in 15 kg of water, focusing on spraying tender shoots and the undersides of leaves. If abnormalities such as leaf curling are observed, immediately rinse with clean water and apply calcium and magnesium fertilizer to alleviate the problem.
Experiments show that the combined use of regulators and microbial agents is more effective. For example, applying Bacillus subtilis as a root drench three days after spraying Sodium Nitrophenolates can improve the root system's nutrient absorption rate, resulting in an annual thickening of fast-growing locust trees that is 1.5 times that of conventional management.
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