Plant growth regulators can regulate the growth and development of crops, coordinate the balanced use of nutrients, shape the productive plant shape of crops, and promote the high yield and quality of crops.
However, in recent years, due to the increase of old-aged labor force in rural areas and lack of knowledge, this technique has often been misused and caused some mistakes. At present, it is the large crops such as rice, cotton, and corn that use plant growth regulators to prevent plant growth regulators from making mistakes. Based on many years of experience and lessons learned, the author suggests that farmers buy When using plant growth regulators, start with the following points.
The sensitivity of different responses to plant growth regulators is different depending on the type of crop selected. For example, rice seedlings are sensitive to paclobutrazol. When hybrid rice is produced, it is sensitive to the "Ninety-Two O" in order to solve the problem of uneven flowering time. Soaking seeds in cotton, irrigating roots or spraying seeds at seedling stage are sensitive to “802â€, and buds and florescences are prolonged. They are sensitive to dildoamine and auxin. Wheat is sensitive to CKC before jointing. Maize is sensitive to DF-1. Peanuts are relatively long-standing, paclobutrazol sensitive. Soybean and tomato are sensitive to 2,4-D and tomato. Fruit trees are sensitive to the "920".
According to the long-term selection of crops, for example, when the hybrid rice seedlings encounter a poor flowering time, the application of "9O2" to adjust the use of flowering anastomosis can increase the spike rate. If rice or peanuts are prosperous at seedling stage, paclobutrazol is used to promote strong seedlings. Such as cotton buds, flowers and bolls appear crazy, can be used a small number of times, before light and heavy after the method of spraying the spinosad, booster prime. For example, in order to promote early cotton boll opening and pull out the rod early, it can be sprayed with ripening agents such as ethephon or ethanediphosphate in a suitable temperature range after mature. Such as anti-soybeans, tomatoes fall, fruit, available 2,4 - D, tomato spirits and other regulators. To prevent the lodging of wheat, available Chlorhexidine, Dinocycline and so on. Prevent the lodging of corn with DF-1.
According to different environments, the effect of chemical regulation is often very much related to temperature, light, humidity, and soil moisture. Generally, within a suitable temperature range, the higher the temperature, the better the effect. When the temperature is high, the concentration of the application regulator is low. Increase the concentration when the temperature is low. When the temperature of the field crops is too high or too low, they are impeded by the effects of plant growth regulators. However, the effect of 2,4-D or florigen on the flowering of tomatoes caused by falling flowers under adverse weather conditions is obvious. When the sun is sunny, it is better to use conditioners, but to avoid bright light during the summer. High air humidity and good soil moisture are conducive to the absorption and operation of regulators. When the weather is dry, it should be applied after the drought-resistant crops. If the wind speed is too large and the stomata of the leaves are closed, it is not suitable for application. Rainfall after application of the conditioner will flush the liquid and should be reapplied after rain.
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