Checking the seeds is an important task before spring sowing. Because the quality of the seed has a great relationship with the seedling rate and seedling strength. In order to ensure the seedlings and seedlings of spring planting crops, it is necessary to select seeds that are full, orderly, and strong. So, how do you check the spring seeds? First, look at the purity of the seeds. 200 seeds were first removed from the spring sow and then compared with the main traits of the pure seed, and the purity of 100 seeds was finally calculated. The purity of seeds used in production should be controlled at more than 95%. Second, look at the seeds of impurities. First remove a certain amount of spring sowing seeds, and then pick out the impurities, and then call its weight, and finally calculate the percentage of the seed's clarity. The degree of purity of seeds used in production should generally be above 97%. Third, look at the seed germination rate. First remove the 200 sowing seeds and divide them into two parts, put them respectively in the germinator, and do the germination test at the appropriate temperature. Using ordinary germination method, several plates can be used, with a filter paper or a layer of cotton on the plate, and water is added to moisturize it. Then a certain number of seeds are placed neatly and evenly on it, and the plate is placed near the furnace or on the fire bowl. After about 7 days, you can see the number of seed germination, and finally calculate the seed germination rate. Where the production of seeds, the germination rate should be above 95%.