Plant growth regulators have been used in agricultural production for many years. In general, they have played a significant role in regulating the normal growth of crops, coordinating the rational distribution of nutrients, and promoting crop yield and income. Many farmers can easily apply this new technology, which can make the slow growing crops recover quickly, and inhibit the vigorous growing crops to promote their stable growth. The growth and development of crops can be shaped according to people's wishes.

However, in the process of selecting and using plant growth regulators, people often make mistakes and produce negative effects. Some will use promotive plant growth regulators on flourishing crops to make them flourish as they grow. Some of them use delayed plant growth regulators on normal growing crops, which inhibits the growth of crops. Some use a plant growth regulator at a time when it is not very sensitive to its crop development, and there is no response. Some increase the concentration of delayed plant growth regulators at will, resulting in the concentration of plant stems and leaves of crops, and long-term stiffness without hair. Some crops are forced to ripen by early application of ripening agents, which reduces both yield and quality.

In order to prevent mistakes in the use of plant growth regulators, based on years of experience and lessons, the following points should be noted in the selection and application technology:

1、 Difference

1. Correctly identify and distinguish plant growth regulators

(1) The product specification, standard number, production license, product registration certificate, period of validity, and factory name on the label of the selected regulator.

(2) See if the supervision unit is authoritative.

(3) See the effective dose, weight and application method.

(4) Compare it with the genuine product to see if it is fake.

(5) We should distinguish the difference between conditioner and micro-fertilizer. Some active fertilizers can also promote the early growth and early development of crops, but they mainly supplement nutrients and cannot replace plant growth regulators.

2. Selecting plant growth regulators for different crops

Different crops have different sensitivity to plant growth regulators. For example, rice seedlings are sensitive to paclobutrazol. Hybrid rice is sensitive to gibberellin during seed production and flowering. The cotton seedling stage is sensitive to nitrophenol-potassium, and the bud and flowering stage is sensitive to the amine, the regulator and the auxin. Wheat seedlings were sensitive to chlormequat. Maize is sensitive to ethephon. Peanut is more sensitive than paclobutrazol. Soybean and tomato are sensitive to 2,4-D and lycopene. Fruit trees are sensitive to gibberellin and paclobutrazol. Do not indiscriminately abuse plant growth regulators in field production.

2、 According to

"One basis" is to select plant growth regulators according to the growth of crops. For example, when the flowering period of hybrid rice seed production is not met, gibberellin can be used to adjust the flowering period to close to the same, so as to improve the ear rate. If rice or peanuts grow vigorously at the seedling stage, use paclobutrazol to promote their strong and stable growth. If the cotton buds and bolls grow abnormally, a small number of times, light in the front and heavy in the back, can be used to spray chloramphenicol and auxilin. If the cotton bolls and stems are to be pulled out early, it is necessary to spray ethephon ripening agent in the range above 20 ℃ after the autumn peach is fully mature. For example, to prevent soybean and tomato from falling flowers and fruits, directional spraying of 2,4-D, lycopene and other regulators can be used. To prevent the lodging of wheat, we can spray chlormequat and chlormequat before jointing. Ethephon can be used to prevent maize lodging.

(Source: China Fertilizer Information Network)