As an important factor affecting the high yield and stable yield of corn, lodging has been paid more and more attention in recent years. In addition to agronomic measures such as strengthening ction management, spraying lodging control agents to control the lodging products has become more and more extensive. It is used in the ction and management of corn; however, the period of use of corn control agents is very important. Grasping the use of drugs can be done with half the effort. If you miss the use of critical periods, the effect will be discounted and even bring negative harm.

First, the best time for corn control

The period of use of corn control agent is 6-12 leaf stage of corn. The best use period is 7-9 leaf stage, that is, the corn is “higher” to the “knee height” of corn. This period is the early stage of corn jointing, after spraying The corn stems can be thickened, the internodes are shortened, the height of the ears 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 ears, and reduce the empty and bald tips. .

Second, miss the hazards that are easy to occur during the critical period

As mentioned earlier, the best time for corn control agent application is corn 6-12 leaf stage, the best use period is 7-9 leaf stage, too late and too early to affect the effect, 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 pieces, and the corn has passed the jointing stage, which will cause the following problems:

1. Caused incorrect knuckle on the corn: it should have shortened the base 1-3 between the two, but now it caused the middle 4-5 section to shorten between the 1-3 sections of the base, not only can not effectively prevent the corn from lodging, but also lead to corn Poor growth, resulting in reduced corn production in the later period.

2. Influencing 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.

Third, control the application concentration and precautions to strictly control the application concentration

As a plant growth regulator, corn control agent (30% DA-6 ethephon) has 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 ethylene in the corn 6-12 leaves is sprayed, which can significantly dwarf the corn plants and increase the yield significantly.

Precautions

1. Pay attention to the spray height when spraying, and spray it off to avoid heavy spray. In the rain within 6 hours after spraying, reduce the dose and spray again.

2. Drought and less rain years can be appropriate to reduce the use of controlled drugs, such as 30% DA-6 ethephon recommended dosage of 20-25 g / acre; if the drought is not used, once the key drug use period is missed, the late corn sees the rain, It is easy to be fast and mad, resulting in the root and stem base being weak, which greatly increases the late lodging rate. Moreover, the compound of the DA-6 control agent contained in the corn control agent has the functions of drought resistance, disease resistance and stress resistance, and can effectively resist high temperature. Drought, alleviate the impact caused by drought and promote the healthy growth of corn;

3.The rainy year can be appropriate to increase the amount of use, such as 30% DA-6 ethephon agent recommended dosage of 25-30 g / acre.

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