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 to prevent the fall of rice has been increasingly used in corn production.
Optimum timing of corn control
The best application period of corn control agent is 6 to 10 leaf stages, ie corn "foot height" to corn "knee height". This period is the beginning of jointing of corn, and the corn stems can be thickened after spraying. 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.
Non-controlled Wang best time control What are the hazards?
The application of corn control agent is too late or premature to affect the effect, and it will also cause harm.
Insufficient 6-leaf application of corn regulants led to poor stalks and stalks; the number of leaves exceeded 12 in the basic jointing period. At this time, the control agent was used to cause improper shrinkage of corn on the one hand. Phenomenon, the basal part should be shortened between 1 and 3, but now it will result in shortening the middle 4th to 5th, not only can not effectively prevent corn lodging, but also lead to poor corn growth, resulting in lower corn yield, on the other hand affect the ear differentiation of maize , resulting in a small amount of maize pollen, thereby affecting pollination of corn, and ultimately affecting corn production.
Choosing a suitable control product
In theory, all the regulators that can inhibit the growth of corn plants and have a strong dwarfing effect on corn can all 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.
Chlormequat is a gibberellin antagonist whose 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 the like, the mechanism of action of such modulators 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.
Compared with the long time can inhibit the endogenous gibberellin biosynthesis, its main role is to inhibit the growth of new shoots, shorten the length of the internode, increase the thickness of leaves, stimulate root growth.
Methionine, also known as diaminosamine, and Zhuangkansu, can inhibit the growth of plant tips, shorten the length of internodes, and make the plant type compact. It is mainly used in cotton shaping.
Ethylene ethephon is a plant growth regulator that promotes ripening. It can effectively dwarf plants and promote the maturation of leaves and fruits. Numerous experimental results show that the application of ethylene in corn can significantly reduce the internode length, the stem base becomes thicker, support roots increase, the plant height decreases significantly, and the yield-resistance effect is 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.
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 corn control agent, the best application concentration is 300 ~ 500ppm, 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 1000ppm, 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 should be determined according to the situation. The year of drought and drought can appropriately reduce the dosage of Wangwang, and the amount of rain can be appropriately increased in the year of rain.
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