1-Naphthalene Acetic Acid (NAA) with the CAS number 86 - 87 - 3 is a synthetic plant growth regulator. It is a white to yellowish crystalline solid. The molecular formula of 1 - Naphthalene Acetic Acid is C₁₂H₁₀O₂, and its molecular weight is approximately 186.21 g/mol. This product has high purity, which ensures its effectiveness in various applications. It is soluble in ethanol, acetone, and other organic solvents but has limited solubility in water. The melting point of 1 - Naphthalene Acetic Acid is around 134 - 135°C. It should be stored in a cool, dry place away from direct sunlight and sources of ignition.
1. **Promote Rooting**: One of the most common uses of 1 - Naphthalene Acetic Acid is to stimulate root development in cuttings. It can significantly increase the number and length of roots, improving the survival rate of cuttings during propagation. This is widely used in horticulture for the propagation of ornamental plants, fruit trees, and forest trees.
2. **Flower and Fruit Regulation**: It can also be used to regulate flowering and fruiting in plants. By applying appropriate concentrations of 1 - Naphthalene Acetic Acid, it is possible to induce earlier flowering, increase fruit set, and prevent fruit drop. This is beneficial for improving the yield and quality of agricultural products.
3. **Weed Control**: In some cases, 1 - Naphthalene Acetic Acid can be used as a component in herbicides. It can interfere with the normal growth and development of weeds, thereby achieving weed control purposes.
1. **Preparation**: First, dissolve 1 - Naphthalene Acetic Acid in a suitable organic solvent such as ethanol. Then, dilute it with water to the desired concentration according to the specific application requirements.
2. **Application Methods**:
- **Dipping**: For cuttings, dip the base of the cuttings into the prepared solution for a certain period of time, usually 10 - 30 seconds.
- **Spraying**: Use a sprayer to evenly spray the solution on the leaves and stems of plants. Make sure the solution covers the target area.
- **Soil Drenching**: Pour the diluted solution around the base of the plants to allow the roots to absorb the active ingredients.
3. **Concentration Selection**: The appropriate concentration depends on the type of plant, the growth stage, and the specific application purpose. Generally, for rooting of cuttings, a concentration of 100 - 500 ppm is commonly used. For flower and fruit regulation, the concentration may range from 5 - 50 ppm.
1. **Rose Propagation**: A flower nursery used 1 - Naphthalene Acetic Acid to propagate roses. They prepared a solution with a concentration of 300 ppm and dipped the rose cuttings for 20 seconds. After two weeks, the cuttings showed a significant increase in root formation compared to the control group. The survival rate of the cuttings reached over 90%, which was much higher than the previous propagation method without using NAA.
2. **Apple Orchard**: In an apple orchard, the grower applied a 20 ppm solution of 1 - Naphthalene Acetic Acid at the flowering stage. This treatment increased the fruit set by 20% compared to the untreated area. The apples also had a more uniform size and better color, resulting in an overall improvement in the orchard's yield and quality.
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