This new technology was listed as a key agricultural technology promotion project by the Agricultural Department of Hebei Province in 2002. The technology is used to sow summer corn directly on the covered land without using tillage after wheat is harvested in wheat and corn flat areas. It is a cultivation technology that integrates multiple processes such as ditching, sowing, fertilizing, covering earth, and repression. Mainly include a series of techniques for sowing no-tillage machinery for summer maize, straw treatment for former crops, deep application of chemical fertilizers, and chemical weeding. This technology has the functions of saving labor, grabbing time, improving the quality of sowing, reducing the burning of wheat straw and increasing soil fertility. Wheat straw can also inhibit the evaporation of soil moisture and the growth of weeds. It is a farm machinery technology that increases production and efficiency, and has good ecological effects. . Changli County Agricultural Machinery Promotion Station carried out a demonstration demonstration of 4,000 mu in Yujiapu Township in 2002, 0.7 kg per acre, and 1.5 acres per acre. The mu increased corn production by 20 kg. In 2003, it will be popularized throughout the county. It is hoped that the agricultural stations in towns and villages will actively cooperate with the publicity, promotion, and organization of implementation work to jointly make this work a good job. First, the scope of application Suitable for corn planting in wheat and corn Second, the technical points 1, choose a good seed. Maize varieties should be selected middle and early maturity hybrids with a maturation period of about 100 days. The seeds should be carefully selected with a purity of not less than 97%, a germination rate of not less than 95%, and a water content of no more than 14%. In addition, the seeds should be coated or sowed prior to sowing in order to prevent underground pests and seedling diseases. occur. 2, before the preparation of Ji Jiping (1) The wheat planting rake type must take into account the breadth of the no-tillage mulching sowing of the corn and ensure that the hoeing surface is smooth so as to facilitate the planter operation and watering during the growing period of the corn. (2) To prevent and control the armyworm during the growing season of wheat, it is necessary to timely spray herbicides or eliminate weeds in spring. 3, before the straw processing (1) As much as possible, a wheat combine harvester with a straw chopping device should be used for harvesting, and the stubble height should be less than 20 cm. (2) For the wheat combine harvester operation without straw shredding device, the straw shredder can be used to crush or manually spread the straw evenly. (3) For staged harvest wheat operations, the wheat straw should be chopped using a rake and evenly covered in the field after sowing. 4, equipment requirements Planters should have functions such as ditching, deep seeding, planting, earth covering, and suppression. At the same time, it is required to pass through and have strong anti-hanging ability, and it is not easy to widen the open trenches, so as to reduce the resistance of the ditching and reduce the loss of soil. At the same time, the machine spacing and spacing should be adjusted to meet the requirements of agronomic techniques. Semi-precision seeder sowing machine to form a hole better, single and double rice seeds per hole ≥ 70%, precision sowing single-grain rate ≥ 90%, cavity rate ≤ 1%, broken rate ≤ 1%, cover soil should be tight, repression Really. 5, sowing date, broadcast volume The sowing date of summer corn is generally in early June and should be matched with the harvesting operation to form the immediate-acceptance and broadcast operation procedure. Seedling spacing and sowing rate should be determined according to land strength and variety. 6, sowing line spacing To promote wide spacing, dense planting spacing, row spacing to 60-70cm and other spacing is appropriate, in order to facilitate harvester harvesting operations. 7, fertilization, sowing When planting, the depth of the ditch is not less than 5cm, and the ditch of the dung used to open the ditch should be narrow so that the covered straw can be divided to the sides of the ditch without obstructing the ditch. The seeds should generally be sown at 3-5cm from the ground surface. Fertilizer should be applied 5cm below the side of the seed; seed fertilizer is generally selected diammonium phosphate, urea, fertilizer can be about 2.5 kg and 5-10 kg, respectively, using a corn planter with a fertiliser no fertilizer, sowing and fertilization at the same time. Poorly plentiful plots should be built immediately after the broadcast to prepare for follow-up operations. 8, spraying herbicides and pesticides Herbicides are usually sprayed within three days after sowing. The commonly used herbicides include B and A suspension concentrates, duo mixture, atrazine, etc. During operation, care must be taken not to spill or re-spray. Severe insect pests may be associated with pesticides. Spray at the same time. 9, field management (1) Dingling after emergence to ensure the number of basic seedlings. (2) Top-dressing: The period from the seedling stage to the big horn period is the period during which corn grows in need of more fertilizer. According to the law that each grain of 100kg of corn is produced, it needs the law of pure oxygen 3kg and 1.4kg of potassium oxide. Generally, the first top-dressing fertilizer is allocated. In the period, 30-40% of the total amount of fertilizer is used for land occupation; in the big bell-mouth period, the second fertilizer is 60-70% of the total fertilizer. During top dressing, deep fertilization of fertilizers should be used to deepen fertilization. Fertilizer utilization. (3) The disease and insect pests were found to prevent and treat the disease in a timely manner. During the seedling stage, it will focus on the prevention and control of underground pests such as horses, aphids, etc., use of oxygen dimethoate spray, medium-term prevention and control of second-generation corn borer and aphids, the use of drugs furan Danxin, oxygenated dimethoate spray surface.
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