Lodging has always been an important factor constraining the high yield and stable production of corn. To prevent the lodging of corn, in addition to strengthening agronomic practices such as cultivation and management, the spraying of chemical regulators has become more and more widely applied to the cultivation and management of corn. What is the best time for controlling corn? What are the points of attention? How to choose to control Wang products? Xiao Bian came to talk to you today.
The best timing of corn control
The best use period of corn control agent is corn 6 to 10 leaf stage, that is, corn "foot height" to corn "knee height", this period is the early jointing stage of corn, spray thickening corn stem, internode By shortening and reducing the height of ears, the number of layers and strips of the “Kingwang root†can be increased, which can effectively prevent the lodging of corn and can also promote the operation of nutrients to the panicle and reduce empty trees and baldness.
What are the hazards of non-optimal time control?
As mentioned above, the best time for corn control agent application is 6-10 leaf stage of corn, and it will cause harm if it is too late or too early.
The control is too early to endanger: corn is used less than 6 leaf periods, and it is recommended that it be applied after the 6 leaf stage due to premature control, resulting in poor stemming of the corn stem and low stem height.
Control over the hazard too late: corn control agent used too late, the number of leaves more than 12, the corn has been jointing period, will cause the following problems:
1. Improper shrinkage of corn: The basal part should be shortened from 1 to 3 knots. Now it has caused 4 to 5 knots in the middle to be shortened from 1 to 3 knots at the base. This not only can not effectively prevent corn lodging, but also causes Poor growth of corn and late corn production.
2. Influencing the differentiation of maize tassels: After the jointing, the tassels of corn begin to differentiate. If corn growth is controlled at this time, it will affect the differentiation of maize tassels, resulting in less corn pollen, thus affecting maize pollination, and finally affecting corn yield. Therefore, it must not be late to control the corn.
Choose the right control product
Theoretically speaking, any regulator that can suppress the growth of corn plants and has a strong dwarfing effect on corn can be used to control the growth of corn. At present, there are many kinds of products on the market with various names, but the chemical composition is nothing more than the following categories, or a single agent, or its compound preparation.
Chromium
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 the plant's leggy, promote reproductive growth, shorten the plant internodes, develop the root system, and resist lodging.
Triazoles
Such as paclobutrazol, uniconazole and so on. The mechanism of action of these regulators is to inhibit the biosynthesis of endogenous gibberellin, while increasing the activity of indoleacetic acid oxidase in plants and reducing the level of endogenous auxin. It can significantly reduce the plant's top growth advantage, promote lateral shoot growth, and dwarf plants.
Long time
It can inhibit the biosynthesis of endogenous gibberellin and production hormones over a long period of time. Its main role is to inhibit the growth of new shoots, shorten the length of the internodes, increase the thickness of leaves, and stimulate root growth.
Piperidine
Also known as diaminos, strong cotton. Methedrine can inhibit the growth of the top of the plant, shorten the internode length, and make the plant type compact. It is mainly used for cotton shaping.
Ethephon
Ethephon is a plant growth regulator that promotes ripening, effectively dwarfs plants, and promotes the maturation of leaves and fruits. Numerous experimental results have proved that: the application of ethylene in corn can significantly reduce the length of the base internodes, the stem base becomes thicker, support roots increase, the plant height decreased significantly, and the yield-increasing effect was significant. At the same time, ethylene is used to control the growth of corn and has the advantages of long application period, wide application range, and so on.
Control application concentration and precautions
Strictly control the application concentration
As a plant growth regulator, corn control agent has different physiological effects on plants in different concentration ranges. If the concentration is too low, the effect should not be achieved. If the concentration is too high, serious side effects will occur. Therefore, the selection of the appropriate concentration is the key to the application of controlled-wang products.
Such as: ethephon as a corn control agent, the best application concentration of 300 ~ 500mg/kg, the concentration of ethylene in corn 6 to 10 leaves for spray treatment, can significantly dwarf corn plants, significant increase in production. If the application concentration exceeds 1000mg/kg, corn ear development will be abnormal, the number of grains per ear will be reduced, and the yield will be reduced.
The concentration of other control products can be applied according to the recommendation of the factory.
Precautions
When spraying, pay attention to the spray height is not sprayed low, sweep away and avoid re-spray. Within 6 hours after spraying, it rains, and halve the dose and spray it again. The amount of spray will depend on the situation. The year of drought and drought may appropriately reduce the use of Wangwang, and the amount of rain may be increased.
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