How can corn cultivation be high-yield? Keep these in mind!
Corn is a common crop in China, and large areas of corn are grown in many areas. For the growers, the production of corn is closely related to their own interests. Everyone pays great attention to the issue of high yield. How can corn be managed to increase production? Let's take a look at it.
1. Matching of seeds and machines during precision sowing
1. The purity of the seeds is not less than 98%, and the germination potential cannot be lower than 95%. Most ordinary seeds do not meet this requirement.
2, to ensure the scientific planting density, density will be lodging, empty stalks, susceptible to disease, too thin, even if the head is large, the number of spikes per acre will not limit production.
3, use good seedling protection measures: 1 plots without irrigation conditions deep sowing, the depth of the plots that can be watered at any time can not exceed 5 cm, the best 3 cm, sowing too deep and then flooding will cause the seeds to smash, 2 seeds and fertilizers are good to be applied and burned, and the amount is more serious.
4, the size of the planter and seeds should be matched, otherwise the card will be sorted or squeezed.
Second, the rational use of herbicides
1. Post-emergence weeding
Corn herbicides are divided into pre-emergence and post-emergence herbicides. Because of the many problems of pre-emergence herbicides, improper use can easily cause phytotoxicity and lead to reduced yield of corn. Therefore, the weeding of summer maize seedlings is gradually replaced by post-emergence weeding. However, it is important to emphasize that some of the post-emergence herbicides can be sprayed in the previous stage. The following problems should be noted when using:
(1) Do not spray after more than 5 visible leaves, and do not use organophosphorus pesticides for 7 days before and after application. Otherwise, it should be sprayed (spray only on the ground), otherwise it will easily cause phytotoxicity;
(2) The spray concentration should be appropriate;
(3) In the case of high temperature and windy weather, repeated sprays and sprays are late, and the liquid spray is sprayed on the corn heart and so on.
(4) The length of corn to 6 to 9 leaves is the most sensitive period for corn to herbicides. At this time, the spray is easy to cause phytotoxicity. After 9 leaves, the low-dose directional spray between rows can be considered to control grass damage.
(5) 2,4-D butyl ester and sodium dimethyltetrachloride are highly susceptible to phytotoxicity when used as a post-emergence herbicide.
2, middle and late weeding
When the grass is in the middle and late stages of corn, it can be sprayed and weeded with a paraquat-like contact agent solution and a protective cover. Green plants will be burnt to death if they are contacted with herbicides. Therefore, when using them, they need to be covered with mineral water bottles or plastic bowls in front of the sprayer to prevent the splash of the liquid to form a phytotoxicity.
Note that glyphosate must not be used. Because glyphosate is a systemic herbicide, the whole body will get sick after absorption. Therefore, the drug should be used with caution in the middle and late stages of corn, otherwise it will easily lead to dead corn and reduced yield. .
3. Rational use of chemical control agents
Chemical control agent, what time is the most suitable:
(1) Generally, spraying corn chemical control agent in the 6-8 leaf stage (half meter to one meter high) to enhance the lodging resistance of corn;
(2) Do not over-hydrate the seedlings during the jointing period, and keep the seedling density not too large. Otherwise, it is easy to prompt the seedlings, and pay attention to timely prevention and control of pests and diseases.
(3) Don't spray it too late, spray it at a height of 1 meter, and the lodging resistance of corn will be worse. And pay attention to the spraying time, it is best to choose the morning sun 9:00 and 4 pm after the spray, the weather is mild, not easy to form the key. Do not re-spray after the chemical control drug is swept away, otherwise it will reduce production due to phytotoxicity.
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