Common "7 big problems" in the application of plant growth regulators in vegetables
In the process of growing vegetables, in order to make them grow healthily and increase the yield, the application of plant growth regulators is indispensable, but it is also prone to problems during the spraying process. Let’s talk about spraying in plant growth regulators. The “7 big problems†that are common in the process of application are accompanied by solutions.
Problem 1. Inappropriate choice of species: Each plant growth regulator has certain characteristics and functions. If the species is not properly selected, the expected effect will not be achieved. For example, when cucumbers are sprayed with 100-200 mg/kg of ethephon in 3 to 4 true leaves of the seedlings, they can promote the growth of the female flowers and increase the yield; if the gibberellin is mis-selected, it will be counterproductive and cause a reduction in production.
Problem 2: Insufficient or excessive concentration: Plant growth regulators are very strict in concentration requirements, and insufficient or too high concentrations can not work. The same agent can even produce completely different effects due to different concentrations. Taking the use of 2,4-D as an example, when the concentration is 10-20 mg/kg, it can promote the preservation of the fruit of the tomato and stimulate the expansion of the ovary; when 1000-2000 mg/kg, it can kill many dicots. . Before use, you must read the instruction manual carefully and follow the instructions.
Problem 3: Improper application method: There are many types of plant growth regulators , and the application objects and purposes are different. Therefore, there are many methods used. The common methods are solution spraying, solution dipping method, soil pouring method and powder coating. Law, etc., only when the method is right, can get twice the result with half the effort. Appropriate use methods should be adopted according to the type, dosage form and active ingredients of the plant growth regulator, and the method is simple, economical, and high in efficacy. For example, chlormequat can be poured into the soil of tomato seedbed by soil pouring to prevent the lengthening.
Problem 4: Disuse of the drug site: Even if the plant growth regulator has the same concentration, the effects on different organs of the plant are different. For example, 20 mg / kg of 2,4-D solution has the effect of preventing the loss of tomato flowers, but when 2,4-D is contaminated with young leaves and shoots, it is prone to phytotoxicity, resulting in the deformation of young shoots and shoots. Deformation.
Problem 5: Premature or late use of drugs: The response of different growth and development stages of vegetables to plant growth regulators is very different. The premature or late use of the drug does not reach the expected effect. For example, before harvesting, spraying the immature watermelon fruit with 100-500 mg/kg of ethephon solution can mature 5 to 7 days earlier, but it should be treated when the fruit is basically long and not mature. If the treatment is too early, the fruit is not yet enough, which will affect the yield. If the treatment is too late, the ripening effect is not obvious.
Problem 6. Unreasonable mixing of drugs: Improper mixing between several plant growth regulators will reduce the use effect and even cause phytotoxicity, resulting in reduced production. Generally, the two types of plant growth regulators, which are generally promoted and inhibited, have a mutual resistance and cannot be used in combination, and the use interval cannot be too close. Such as auxin, gibberellin and abscisic acid, chlormequat, ethephon, triiodobenzoic acid and cytokinin, cytokinin and chlorophyll, etc., can not be mixed. In addition, the mixed use of plant growth regulators and pesticides should also be taken care of. Generally, plant growth regulators cannot be mixed with lime or the like, and ethephon cannot be mixed with copper preparations such as Bordeaux mixture. Before the plant growth regulators are mixed, it is necessary to carry out a pharmacodynamic test to prove that there is no antagonistic effect between each other and no phytotoxicity is allowed, and the application can be applied in a large area.
Problem 7. Spraying measures are not matched: The main function of plant growth regulators is to regulate the growth and development of vegetables, and not to supply energy materials to vegetables. After the use of plant growth regulators, if the agricultural measures are not strengthened at the same time, the yield increase effect is not good. For example, if the tomato flowering period is 10-20 mg/kg of 2,4-D or 20-40 mg/kg of anti-dropping spray or flower, it can prevent the tomato from falling and falling, so as to obtain the early maturity and high yield of the tomato. It must be combined with the comprehensive measures of fertilizer and water management, pest control, etc. Only effective control of vegetable growth period and early premature aging can achieve the expected good results.
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