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1. Selecting precision and semi-precision seeders in accordance with local conditions The implementation of precision and semi-precision seeding is an important measure for achieving precision agriculture with machinery, and is the core of implementing mass cultivation. Practice has proved that, under the existing conditions of soil fertility and fertility, appropriate reduction in seeding rate makes wheat seedlings suitable starting point, reasonable dynamic structure, adequate light in the field, robust individual development, and large and heavy grains, which is widely accepted by farmers. High yield measures. However, the addition of precision and semi-precision seeders should be adapted to local conditions. If the field is medium in fertility, agronomically, the main stem and panicle should be used in the same way as the tiller and the panicle should be weighted. This requires that the basic seedling should reach 1.8 million to 2.70 million plants per hm2 (seeding 90~135kg/hm2), the output reaches 5250~6000kg/hm2, we should choose an external groove wheel type metering device equipped with 16 straight slots, and can complete half of the procedures such as rotary ploughing, ditching and covering and repression at one time. Precision seeder. If the field has superior fertility, the agronomic uses small groups, strong individuals, and cultivation methods based on tillering, requiring basic seedlings to reach 1.2 million to 1.8 million plants/hm2 (sowing 60 to 90 kg/hm2), and the yield reaches 6750 kg/ Above hm2, we should choose a seed meter equipped with a socket wheel type and a conical disc type, and can complete the precision seed drills such as rotary ploughing, trenching, and covering and repression at one time. The choice of precision and precision seeder also varies depending on the power machine. The specifications for the precision and semi-precision seeders are designed based on the size of the power and the mounting method of the tractor. When selecting, select the seeder that matches the tractor's power and the same mounting method according to the instructions or signs. 2. Use precision and semi-precision seeders to implement mechanical precision and semi-precision sowing, so that the seedlings will be uniform, seedlings, seedlings strong, and can save seeds, reduce costs, increase production, such as wheat crops can be The species 25kg/hm2, the cost of 150 yuan / hm2, increase production 750kg / hm2. However, if it is used improperly, it will be counterproductive. The following describes the technical points of use of precision and semi-precision seeders for reference. (1) Do a good job of maintenance before entering the field. First of all, to the tractor and seeder of the transmission, rotating parts, according to the requirements of the specification, add lubricants, especially before each shift should pay attention to the drive chain lubrication and tension and tighten the bolt on the seeder; Second, to clean up the planting The debris in the box and the grass and soil around the opener ensure good conditions. (2) Do a variety of adjustments. First, according to the instructions and agronomic requirements of the user's manual, adjust the seeding rate; then adjust the depth of the rotary tillage, trenching, earth covering, and repression wheels; adjust the row spacing of the opener and horizontally The tightness of the transmission chain is moderated. (3) Do a good job of piloting the field. In order to guarantee the quality of sowing, before sowing a large area, it is necessary to insist on a trial broadcast of 20m. Please contact the agricultural technicians, farmers, etc. to check and confirm that they meet the local agronomic requirements and then conduct extensive sowing. (4) Pay attention to adding seeds. Add seed to the seed box to ensure that the seed is not effective, and then to ensure the effectiveness of the seed; and then add the amount of the seed box to at least be added to cover the entrance of the seeding box to ensure smooth seeding. (5) Pay attention to a straight line running at a constant speed. The operator should choose the operation walking route to ensure the convenience of adding the type and mechanical access. When planting, pay attention to uniform speed and straight line, and do not stop or stop midway, so as to avoid replay and missing broadcast; in order to prevent the opener from plugging, the seeder’s When the lift is to be operated in the process of traveling, turning or turning, the planter should be lifted. If you find openers, repulsion rounds of grass or clay, clean up in time. Precision, semi-precision seeders should not be sown at night.