Recently, several farmers have caused drug damage to crops because of improper plant growth regulators, and crops have obviously caused plant growth regulators, but they themselves do not know that it is a drug, let alone how the drug damage on these crops is caused.
There are many types of plant regulators on the market, such as paclobutrazol, chloropyrurea, gibberellin, amine fresh esters, ethylene, burosin, chlorphenin, sodium nitrophenol, anti-fallin, fruit setting, tricatanol, and brassinolide, which is often mistaken for foliar fertilizers, etc., all belong to the category of plant growth regulators.
The main functional role of common plant growth regulators
The amount of plant growth regulator is very small (generally only a few milligrams or a few grams per acre of land per time), but after use, it can play a good effect of four or two thousand pounds on the crop, for this reason, more and more farmers gradually recognize and use these plant growth regulators, many of which are blindly used, excessive use, excessive use, misuse of plant growth regulators on crops, and then often encounter crop damage caused by improper use of plant growth regulators, especially those planting fruit tree crops, Farmers and friends of cash crops, fruits and vegetables, this kind of drug problem occurs particularly often.
In order to guide everyone to better understand and rationally use various types of plant growth regulators, the agricultural technology basket will write two articles specifically to introduce you to the use of plant growth regulators, this article, first of all, let me tell you: In which cases the use of plant growth regulators is easy to lead to crop damage? After reading it, you can know how to avoid the drug damage caused by the improper use of plant growth regulators.
In the next article, the agricultural technology basket will introduce you again: (1) Why do many people often call plant growth regulators "hormone" drugs and talk about discoloration? (2) What are the advantages and disadvantages of using plant regulators on crops? (3) What are the symptoms of drug harm caused to crops after improper use of several common plant regulators (regulator drug damage diagnosis method) ;(4) How should the crop be alleviated and remedied in time after the improper use of plant growth regulators?
Nonsense is not much to say, the following to introduce to you a few common situations that are easy to cause crop plant regulator drug damage:
There are many kinds of causes of plant regulator drug damage to crops, but also more complex, in general, the cause of crop damage is due to the improper use of plant growth regulators, the main reasons are the following seven situations:
The first reason: the amount of use or concentration of regulators on crops is too large.
Each plant growth regulator has a relatively strict dosage concentration, even if the same regulator on different crops dosage concentration is also different, the use of tolerance can not have half a point of error, the concentration is low or the amount of less can not achieve the ideal drug effect, the concentration is high or the amount is large, it is easy to cause crop damage and reduce production. Under normal circumstances, the amount of plant growth regulators used per acre of land is only a few grams or even a few milligrams, and if it is used more, it will produce drug harm.
For example, the rational use of ethylene on (Giant Peak) grapes can promote the coloring of fruit grains, and if the dosage concentration is too large, it will cause a large number of grape grains to fall. For example, naphthaleneacetic acid, a plant growth regulator, can be used on fruit trees according to the concentration of 10 mg / g to preserve flowers and fruits, if used in watermelon according to the concentration of this liquid, it is easy to cause watermelon to appear harmful and the problem of leaf turning or wilting occurs.
The second reason: regulators are used too many times and too often on crops.
Under normal circumstances, the number of times each plant growth regulator is used each year is generally limited to 2-3 times, if we use it uncontrollably and arbitrarily, it will cause harm to the normal growth and development of crops.
For example, reasonable spraying of paclobutrazol during the growth period of peanuts can play a role in controlling prosperity and promoting flowers, but if paclobutrazol is continuously sprayed more than 3-4 times during the growth period of peanuts, or the interval between two uses is less than 5-7 days, it will cause excessive dwarfing of peanut seedlings, serious growth inhibition and reduced yield.
The third reason: the time point of use of the regulator on the crop is not correct.
Each plant growth regulator has a specific period of use on the crop, if everyone uses the plant growth regulator on the crop for the wrong time, it will also cause crop damage and reduce yield.
For example, the use of chloropyridine in watermelon during the flowering period can play a role in puffing and sweetening the fruit, but if you wait until the young melon of the watermelon grows to more than 10-15 cm and then spray, then it is easy to cause the fruit of the watermelon to be hollow, loose, cracked and the sugar and taste flavor become worse. For example, the use of epherine when the seedlings grow to 4-6 leaves can play a role in promoting the early blooming of female flowers, but if the seedlings grow to 3-4 leaves and the use of ephthylide too early before, it is easy to cause the seedlings to have adverse consequences of drug poisoning.
The fourth reason: the use of regulators on crops is not the right way.
Different plant growth regulators have different uses, such as leaf spraying, irrigation of roots, or application of fruit spikes, but not all plant growth regulators can be used in three ways.
For example, using gibberellin liquid to dip the fruit panicle 2-3 weeks after the full flowering period of the grape can make the grape panicle longer, the fruit grain larger, the sugar content higher, and the ripening earlier, but if we use gibberellin after the grape flower, we will change to the method of spraying the fruit panicle with the liquid when the grape is used, so it is easy to cause the grape to occur in the same fruit spike in the later stage of the same fruit grain "size grain" phenomenon of different sizes.
The fifth reason: the regulator is used incorrectly on the crop.
Different plant growth regulators have specific objects and purposes of use on crops, but also have different principles of drug action, if we use the wrong position on crops, it is easy to cause crop damage.
For example, when we use 2,4-D dipping flowers to improve fruit set rate during the flowering period of tomatoes, the location of 2,4-D liquid application must be the flower part, if the 2,4-D liquid drops on the young leaves of tomatoes during the dipping process, this will cause the tomato to be contaminated with the tenderness of the liquid and the young leaves.
The sixth reason: the use of weather and humidity on crops by regulators is not correct.
The use of any pesticide requires a suitable weather condition, especially the appropriate temperature and humidity conditions, otherwise it is easy to cause crop damage.
For example, when we use various types of plant growth regulators, we generally require that around 10 a.m. or 4 p.m. and the temperature range of 15-28 degrees, the temperature is not high or low during this time, the air humidity is also acceptable, if we use spray plant growth regulators in the case of high temperature at noon or particularly dry air, then crops are prone to symptoms of drug poisoning and suffering due to excessive absorption of the liquid; conversely, If we use plant growth regulators in rainy or windy weather or very low temperatures, either the effect is not good after taking the drug, or the crop cannot be absorbed and fails after the drug. In addition, in general, when using various drugs in the season with high temperature or low humidity, the dosage of drugs should be appropriately reduced, and on the contrary, the dosage of drugs should be appropriately increased according to the actual situation to ensure the effect of medication. In particular, some plant growth regulators that are more sensitive to temperature, such as ethylene, 2,4-D and other drugs, when used at temperatures above 30 degrees or below 15 degrees, it is easy to cause crop damage, which we should pay special attention to.
The seventh reason: the type of regulator used on crops is not the same as the object.
A variety of plant growth regulators on the market, some are suitable for use in weak seedlings to promote growth, some are suitable for using wang seedlings to inhibit or ease growth, some are used to promote root growth seedlings, some are used to promote flowering and fruit setting, some are used to inflate the sweetness and coloring of the fruit, and some plant growth regulators can be applied to the types of crops are also different, if you use the plant growth regulator to the wrong use object, then it is easy to cause crop damage.
For example, the crop is often used to control the potozole of this plant growth regulator, it is suitable for use in the seedlings to achieve the effect of controlling the strong tree, ordinary seedlings should be used as little as possible or not, and weak seedlings must not be used, otherwise the weak seedlings are used more and more the growth is worse.
Well, about the reasons why it is easy to cause plant regulators to occur in crops, the agricultural technology small back basket will first introduce so much to you! In a word: the reason why the crop uses plant regulators is basically due to the improper use of our farmer friends themselves, if you can grasp the drug characteristics and correct use of each plant growth regulator, not only will not cause crop damage, but it is conducive to helping crops achieve better high yield and good harvest!
Friends who want to know more about the use of plant growth regulators can read my article tomorrow.