Lodging has always been an important factor restricting the high and stable yield of corn. To prevent corn lodging, in addition to strengthening cultivation and management and other agronomic measures, spraying chemical regulators to control prosperous and prevent lodging has been more and more widely used in corn production.
The best time to control prosperous corn
The best application period of corn prosperity control agent is the 6-10 leaf stage, that is, the "foot height" of corn to the "knee height" of corn. This period is the initial stage of jointing of corn. After spraying, the corn stalk can be thickened and the internodes can be thickened. Shortening, the height of the ear is reduced, and the number of layers and the number of "bawang roots" is increased, which can effectively prevent corn from lodging, but also promote the movement of nutrients to the ear, reducing empty trees and bald tips.
What are the hazards of non-boom control?
Not to mention the effect of corn prosperous control agent applied too late or too early, it will also cause harm.
When corn is less than 6 leaves, the stalk is not vigorous and the stalks are too low. The jointing stage is basically passed when the number of leaves exceeds 12. At this time, the application of wang-controlling agent will cause incorrect shrinkage of corn. This phenomenon should have shortened the 1-3 internodes at the base, but now it has shortened the 4-5 internodes in the middle, which not only can not effectively prevent corn lodging, but also leads to poor corn growth, resulting in reduced corn production in the later stage, and on the other hand, it affects corn tassel differentiation. , Resulting in a small amount of corn pollen, thereby affecting corn pollination, and finally affecting corn yield.
Choose the right Kongwang product
Theoretically, any regulator that can inhibit the growth of corn plants and dwarf and strengthen corn can be used to control the growth of corn. At present, there are many kinds of such products on the market with various names, but their chemical composition is nothing more than the following categories, or a single agent, or a compound preparation.
Chlormequat Chlormequat is an antagonist of gibberellin, and its mechanism of action is to inhibit the biosynthesis of gibberellin in plants. Its physiological function is to control plant growth, promote reproductive growth, shorten plant nodes, develop root systems, and resist lodging.
Triazoles such as paclobutrazol, uniconazole, etc. The mechanism of action of these regulators is to inhibit the biosynthesis of endogenous gibberellin, while increasing the activity of indole acetate oxidase in plants and reducing the level of endogenous auxin. It can obviously weaken the top growth advantage of the plant, promote the growth of side buds, and dwarf the plant.
Biju Bijiu can inhibit the biosynthesis of endogenous gibberellin. Its main function is to inhibit the growth of new branches, shorten the length of internodes, increase leaf thickness, and stimulate root growth.
Mepiperidine, also known as benzalkonium, can inhibit the growth of the top of the plant, shorten the length of the internodes, and make the plant compact. It is mainly used for cotton shaping.
Ethephon is a plant growth regulator that promotes maturity. It can effectively dwarf plants and promote the maturity and shedding of leaves and fruits. Numerous test results have proved that the application of ethephon to corn can significantly reduce the length of the base internodes, the stem base becomes thicker, the supporting roots increase, the plant height decreases significantly, and the lodging resistance and yield increase are significant. At the same time, ethylene is used to control the growth of corn, which has the advantages of longer application period and wide applicable concentration range.
Strictly control the application concentration
As a plant growth regulator, maize growth regulator has different physiological effects on plants in different concentration ranges. Too low a concentration will not achieve the desired effect, and too high a concentration will cause serious side effects. Therefore, choosing the right concentration is the key to the application of Wangwang products.
For example, ethephon is used as a maize control agent, and its optimal application concentration is 300-500ppm. Ethephon of this concentration is sprayed on 6-10 leaves of maize, which can obviously dwarf maize plants and increase yield significantly. If the application concentration exceeds 1000ppm, it will cause malformed corn ear development, reduce the number of grains in the ear, and severely reduce the yield.
The concentration of other control products can be used according to the manufacturer's recommendation.
Precautions
When spraying, pay attention to spraying high and not low, sweeping over, avoid respray. If it rains within 6 hours after spraying, halve the dose and spray again. The amount of spraying should also be determined according to the situation. In dry and drier years, the amount of prosperous control drugs can be appropriately reduced, and in rainy years, the amount can be appropriately increased.
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