When the temperature is high and the soil is humid, it is the period of vigorous growth of crops. Farmers must control the vigorous growth of crops, otherwise the quality will be reduced, the yield will be affected and the harvest will be reduced.
Therefore, crop growth control is a very important and technically demanding farm work. At present, farmers mainly use pesticides to control crop growth, which is convenient and fast, and works with one spray.
So, there are many kinds of growth control agents on the market now, and they are mixed with good and bad, which makes people dazzled. I don't know which drugs have a great growth control effect, less residue on crops, and less negative impact of drugs.
The following is an analysis of the most common economical and practical growth control agents on the market, Paclobutrazol, uniconazole, and chlormequat chloride. These three agents are for reference. I hope farmers will have some understanding of these three growth control agents.
Paclobutrazol
Paclobutrazol is an antagonist of gibberellic acid and a triazole-type, highly effective and low-toxic plant growth retardant. It is easily absorbed by the roots, stems, leaves, flowers and seeds of plants and is conducted through the xylem. It is an inhibitor of endogenous gibberellin synthesis in crops.
The application value of paclobutrazol in crops lies in its control effect on crop growth:
① It inhibits the synthesis of gibberellic acid.
② It slows down the division and elongation of plant cells.
③ It can inhibit the elongation of new shoots and stems, the vigorous growth of plants, shorten the internode length of crops, promote the tillering, germination and formation of lateral buds of crops, increase the number of flower buds and leaf buds, increase the fruit setting rate, increase the chlorophyll content of crop leaves, increase the synthesis and content of soluble proteins and nucleic acids, reduce the permeability of leaf pores and the evaporation rate, promote the sturdiness of plants, develop the root system, improve the resistance of plants to adversity, and have the ability to resist lodging, drought, cold and disease, etc., increase the calcium content of fruits, and reduce storage diseases.
④ When used on a variety of fruit trees, it can inhibit the growth of roots and vegetative bodies, increase chlorophyll content, inhibit the growth of top teeth, promote the germination of lateral teeth, and the formation of buds, increase the number of flower buds, improve coloring ability, improve fruit quality, and improve economic benefits. Therefore, it is known as one of the best growth retardants.
Uniconazole
Uniconazole is a triazole broad-spectrum plant growth regulator, an inhibitor of gibberellin synthesis, and has a certain bactericidal effect. It can inhibit the germination of some fungal spores and control the nutrient absorption of mycelium.
Uniconazole has a strong growth inhibitory effect on herbaceous or woody monocotyledonous and dicotyledonous plants. Uniconazole mainly inhibits the elongation of internode cells of crops.
Uniconazole can be absorbed by the roots, stems, leaves, and seeds of plants, and can be conducted in the body. When sprayed on stems and leaves, it can be internalized upward, but has no downward conduction effect. This characteristic is the most obvious difference from the effects of other growth control agents.
The mechanism of action of Uniconazole is basically the same as that of Paclobutrazol. It mainly controls the nutritional growth of crops, inhibits cell elongation, shortens the internode distance, dwarfs the height of plants, promotes the growth of lateral buds, and the formation of flower buds, and increases the stress resistance of crops.
The activity of Uniconazole is 6 to 10 times that of Paclobutrazol, and the concentration used is 5 to 10 times lower than that of Paclobutrazol. The residual amount in the soil is only 10% of that of Paclobutrazol. Therefore, the use of uniconazole land has very little impact on subsequent crops and can be ignored.
Chlormequat Chloride
Chlormequat chloride is an antagonist of gibberellins. It can enter the plant body through the leaves, young branches, leaf buds, roots and seeds of crops, inhibit the cell elongation of crops, but cannot inhibit cell division. It can effectively control the vigorous growth of plants, shorten the internode distance of plants, make crop plants shorter, promote the development of root systems, improve the water absorption capacity of plant roots, affect the accumulation of proline in plants, and improve the stress resistance of plants.
Chlormequat chloride can make the stems thicker, prevent crops from lodging, promote the development of root system, resist drought, promote the accumulation of nutrients, and enhance the ability to resist cold, salt and alkali, and pests and diseases.
Chlormequat chloride can also promote the photosynthesis of crops, enhance the chlorophyll content, increase the leaf color, deepen the leaf color, and increase the thickness of leaves. Enhanced photosynthesis can transform the vegetative growth of crops into reproductive growth, thereby improving the fruiting ability of certain plants, improving quality, and increasing yield.
In short, paclobutrazol, uniconazole and chlormequat chloride are all retardants for crop growth, which can be used as plant growth control agents to achieve the effect of controlling the vigorous growth of crops. However, these three growth control agents have their specific characteristics. When using them, you can choose the appropriate growth control agent based on the characteristics and the needs of crop growth control and the environment.
