The sowing of spring corn in some provinces of our country has basically ended, and corn in most areas is in the period from seedling emergence to seedling stage. Since March, due to the low rainfall in most of the maize-producing areas, the daily maximum temperature is higher than in previous years, and drought has appeared in some areas. Under the influence of previous droughts and other effects, the main problems in current corn production are: weak seedlings, slow seedling growth, de-fertilization in some plots, weeds in the fields, and serious underground pests. In response to the above issues, the author proposes the following technical opinions:
Comprehensive prevention and control of underground pests Maize seedling stage is the main period of occurrence of underground pests, and the underground pests such as ground tigers, badgers, and cockroaches are more harmful. Generally, sprays or sprays are used to control underground pests, mainly to eliminate 3rd instar larvae. The selection of pesticides should be based on pyrethroid insecticides and organophosphorus pesticides. Can be used 2.5% deltamethrin EC 2000 times or 20% fenvalerate EC 2000-3000 times; also available 2.5% trichlorfon powder sprayed 1.5-2 kg per acre spray directly on corn seedlings; Or 48% chlorpyrifos EC or 50% phoxim EC 1000 times, directly sprayed on the root of corn seedlings, the liquid infiltration into the soil is appropriate, mu water consumption of 50-60 kg is appropriate. In addition, we can prevent and control underground pests by spreading poisonous soil, artificially catching larvae, bait trapping, and timely clearing weeds in the fields.
When the seedlings are promptly inspected and the shortage of corn is emerged, the seedlings shall be checked and the seedlings shall be promptly replanted or supplemented when they are found to be off-peak. In the absence of seedlings before the 2 leaf stage, full seeds can be used to sow germination and then watering to replant; in the absence of seedlings after the 2 leaf stage, the seedlings can be transplanted with soil, and when it is cloudy or in the evening, watering is carried out after planting. In addition, two strains can be left near the seedlings to ensure basic density.
Appropriate time seedlings, Dingmiao using artificial live plots, appropriate time seedlings, Dingmiao. The thinning is usually carried out in 3-4 leaves, remove weak, white, yellow, disease, inferior, hybrid seedlings; Dingmiao is generally carried out in the 5-6 leaves, according to the planned density of strong seedlings, timely removal of excess seedlings to prevent disputes fat.
Strengthen Chemical Weeding During the seedling stage, weed herbicides should be selected strictly for the types of herbicides, grasp the best drug use period, and accurately control the dosage. Before emergence of maize seedlings, pre-emergent herbicides, such as acetochlor, may be used to water 40-50 kg per acre with an effective composition of 70 g, or 40% dimethoate, 200 kg per acre, and 50 kg per acre, evenly sprayed. Surface, can effectively control annual grass weeds; maize seedlings in the 5-6 leaves, the choice of corn herbicides, targeted spray between rows.
The topdressing fertilizer for seedlings at the top of the seedlings has the functions of promoting roots, strengthening seedlings and promoting leaves and strong stalks. In the five seedlings of corn seedlings, 4-6 kilograms of urea and 5 kilograms of potassium chloride are used for raising the seedlings. Fertilizer should be differentiated, with water to fertilize, re-applied seedlings and weak seedling fertilizer, pay attention to the side deep, promote the "small seedlings to catch large seedlings, weak seedlings to meet strong seedlings" to achieve balanced growth of corn seedlings.
Timely cultivator corn seedling timely timely cultivator, can play a "control to promote the next" role. The cultivating method should be “light on the side of the seedlings and deep in the middle†to remove weeds and not press the seedlings. The depth is generally 3-5 cm.
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