1. Wind-selection is the use of wind to clear smaller and lighter seeds, retaining heavier seeds. The use of wind and gravity to scatter small particles, crumbs, etc. in the downwind, and the seeds of the top wind as a species of use, this is a long-term method commonly used by farmers in our country. Mechanized winnowing can be done by using a field-lifting machine.
2. Screening is the use of different characteristics of the size of the seed, using different structures of the sieve or screening machine to select the species. Types of sieves include bamboo wire round sieves, rectangular wire mesh sieves, and rectangular sieve baskets that are wire-drawn and braided and have a length of about 2 meters and a width of about 1 meter. The distance between the wires depends on the seed size. When the seeds are selected, the sieve is placed at a slope of about 30 degrees, and the inertia effect of the rolling and sliding of the seeds is utilized, which not only plays a role of sliding selection, but also utilizes two wire gaps to separate small seeds and weed seeds smaller than soybean seeds and half Grains, grains, sediments, etc. are sieved into the bottom of the sieve. Therefore, soybean seeds and weed seeds can be selected separately. For example, the cockles slip performance is worse than that of soybeans. During the process of seed selection, the cocklebur often falls under the foot of the sieve, and the soybean seeds are bright and smooth and have a large rolling speed, and they roll out from the bottom of the screen. The Xanthium and soybean seeds were separated from the sections of different parts. This method is efficient and has high quality of selection. It is a good method for screening.
3. Particle selection is generally based on the wind election, screening and then based on the selection of particles, through the further removal of uncooked grains, wolfberry grains, diseased grains, insect food grains, small grains and mixed grains and so on. Select seeds that are full and full without damaged seed coats. At the time of selection, attention should also be paid to the main characteristics of seed grain, seed coat, umbilicus, and luster. This is an effective selection method to increase the purity and cleanliness of the variety, and it can be used before the broadcast.
4. Machine selection is the use of beans on the slope of the principle of rolling different speeds to produce soybean grain separator, widely used in Northeast China in recent years. It is a selection tool with high selection efficiency and good quality. Each person can select soybean seeds 80 to l00 pounds per hour. After two or more grain-selected soybean seeds, more than two-thirds of the insect-eaten grains, broken petals, deformed grains, pods, and clods can be removed. In order to improve the quality of the selected seeds, a field-lifting machine may be used first, followed by selection by a grain sorter. In units with a high degree of mechanization, a series of duplex operations such as field machines, screening machines, grain sorters, lifters, and pushback machines can be made, and the selection of soybeans can be fully mechanized.
Seed seeds must be selected and then tested for germination after the test, generally require more than 95% of the germination rate, strong seed germination potential for seed use.
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