Lodging has always been an important factor limiting the high yield and stable yield of corn. In order to prevent corn from lodging, in addition to agronomic measures such as strengthening cultivation management, spraying chemical regulators has been widely used in the cultivation and management of corn.
1. The best time for corn control
The best use period of corn control agent is corn 6~10 leaf stage, that is, corn "high" to corn "knee high". This period is the early stage of corn jointing. After spraying, corn stems can be thickened and internodes. Shortening, the height of the ear position is reduced, and the number of layers and the number of "overlord roots" are increased, which can effectively prevent the lodging of corn, promote the operation of nutrients to the ear, and reduce the empty and bald.
2. What are the hazards of non-controlling the best time control?
As mentioned above, the best time for corn control agent application is corn 6~10 leaf stage. The effects of too late and too early will not cause harm, but also cause harm.
Controlling premature hazard: Corn is used in the 6-leaf stage. The control is too early, causing the corn to be weak and the stem is too low, so it is recommended to apply after the 6-leaf stage.
Late control of the control: the corn control agent is used too late, the number of leaves exceeds 12, and the corn has passed the jointing stage, which will cause the following problems:
1 caused an incorrect knuckle on the corn: it should have shortened the 1-3 knots of the base, but now it shortens the middle 4~5 knots compared with the 1-3 knots of the base. It can not effectively prevent the corn from lodging and also cause corn. Poor growth, resulting in reduced corn production in the later period.
2 affecting the differentiation of maize tassels: After the jointing, the tassels of the corn begin to differentiate. If the corn growth is controlled at this time, it will affect the differentiation of the maize tassels, resulting in less pollen of the corn, which will affect the corn pollination and finally affect the corn yield. Therefore, corn control must not be late.
3, choose the right control products
In theory, any regulator that can inhibit the growth of corn plants and dwarf the corn can be used for corn control. At present, there are many kinds of such products on the market, and the names are varied. However, the chemical composition is nothing more than the following types, or a single agent, or a compound preparation thereof.
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 the growth of plants, promote reproductive growth, shorten the internodes of plants, develop roots and resist lodging.
Triazole
Such as paclobutrazol, uniconazole and the like. The mechanism of action of such modulators is to inhibit the biosynthesis of endogenous gibberellins, while increasing the activity of indoleacetate oxidase in plants and reducing the level of endogenous auxin. It can significantly reduce the growth advantage of the top of the plant, promote the growth of lateral buds, dwarf plants.
Longer
It can inhibit the biosynthesis of endogenous gibberellins and producers, and its main function is to inhibit the growth of new shoots, shorten the internode length, increase the thickness of leaves, and stimulate root growth.
Mepiperidine
Also known as ketamine, strong cotton. Piperidine can inhibit the growth of the top of the plant, shorten the internode length, and make the plant compact, mainly used for cotton shaping.
Ethephon
Ethephon is a plant growth regulator that promotes ripening, can effectively dwarf plants, and promote the maturity of leaves and fruits. Numerous test results have proved that the application of ethephon in corn can significantly reduce the length of the internode, the base of the stem becomes thicker, the number of supporting roots increases, the plant height decreases significantly, and the effect of lodging resistance is significant. At the same time, ethylene is used in corn control, and has the advantages of long application period and wide application range.
4, control the application concentration and precautions
Strict control of application concentration
As a plant growth regulator, corn control agents have different physiological effects on plants in different concentration ranges. If the concentration is too low, it will not be effective. If the concentration is too high, serious side effects will occur. Therefore, choosing the right concentration is the key to applying a controlled product.
For example, ethephon is used as a corn control agent, and its optimum application concentration is 300-500 mg/kg. The concentration of ethephon is beneficial to the spraying of corn 6~10 leaves, which can significantly dwarf corn plants and increase yield significantly. If the application concentration exceeds 1000 mg/kg, the corn ear development will be deformed, the number of grains per ear will decrease, and the yield will be severely reduced.
The concentration of other products controlled by Wangwang can be applied according to the manufacturer's recommendation.
Precautions
Pay attention to the spray height when spraying, and sweep it over to avoid heavy spray. In the rain within 6 hours after spraying, reduce the dose and spray again. The amount of spray should be determined by the situation. In the dry and rainy years, the amount of controlled drug can be appropriately reduced. In rainy years, the amount of use can be appropriately increased.
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