Crop chemical regulation, common mistakes, early prevention

Plant growth regulators can play a very good role in regulating the growth and development of crops and promoting high yield and quality. However, because farmers often use this technology with high technology content improperly, it often causes some mistakes and needs to be highly valued. Based on the lessons learned over the years, the following points should be mastered in the purchase and use of technology.

Different plant selections for different crops are different. The sensitivity of different crops to plant growth regulators is different. For example, rice seedlings are sensitive to paclobutrazol. Cotton soaking, seedling rooting or spraying is sensitive to "802", and buds and flowering period are sensitive to ketamine and auxin. Wheat is sensitive to chlormequat before jointing. Corn is sensitive to DF-1. Peanuts are long-lasting and paclobutrazol is sensitive. Soybeans and tomatoes are sensitive to 2,4-D and tomato spirit. Fruit trees are sensitive to "Ninety-two".

According to the growth trend of the crop, the plant growth regulator is selected. For example, when the hybrid rice is planted, the flowering period is not met, and the "9:20" adjustment is used to adjust the flowering period to increase the ear formation rate. If the seedling stage of rice or peanut is prosperous, the use of paclobutrazol will promote the growth of its seedlings. For example, when the cotton bud period and the flowering and boll period appear mad, a small amount of multiple, front light and heavy methods can be used to spray the ketamine and the auxin. For the purpose of promoting early boll opening and early drawing of the cotton, the ripening agent such as ethephon or ethylene diphosphate may be sprayed in a suitable temperature range after the ripening of the autumn peach. Such as anti-soybean, tomato falling flowers and fruit, can be used 2,4-D, tomato spirit and other regulators. Preventing wheat from lodging can be used to make chlormequat, ketamine and the like. Prevent deflation of corn with DF-1.

The effects of chemical regulation of plant growth regulators for different ecological environments are often related to temperature, light, humidity and soil moisture. Generally, in a suitable temperature range, the higher the temperature, the better the effect. When the temperature is high, the regulator is applied. The concentration should be low, and the concentration should be appropriately increased when the temperature is low. When the temperature of the field is too high or too low, the crops in the field will hinder the regulation. However, the effect of tomato on the application of 2,4-D or nectar in the adverse weather conditions is obvious. It is good to apply the conditioner when the sun is sunny, but it should be avoided in the strong summer light. (Yu Hongzhang, Agricultural Bureau of Xiaogan City, Hubei Province)
Farmers Daily
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