Improved varieties are one of the important factors for increasing production. The national seed sector may not be able to meet its needs in time due to restrictions on provenance and transport conditions. For conventional seeds, farmers can choose their own seeds and seeds, which can not only alleviate the contradiction of lack of provenance, but also prevent the mixture from degenerating, avoid the use of counterfeit seeds, increase the seed quality and save the purchase cost. The following methods are commonly used for simple seed selection, seed retention, and seed storage. Remove crops from miscellaneous and miscellaneous crops Before harvesting crops such as wheat, oilseed rape, rice, and cotton, select the plots with higher purity, according to the typical characteristics of this crop such as grain color, grain shape, spike (horn, bell) type, In the higher plants, the miscellaneous strains, poor growth, and diseased worms that do not meet the typical traits of the cultivar are removed, and mixed, single threshed, single tan, and single storage are used for the seedlings. The field-picking seeds generally increase the yield by 15% to 17.5% and increase the purity by 18.6%. The selected plants were mixed and kept in the plots with low purity. Before harvesting, the best single plants or single panicles that matched the typical traits of the varieties were selected in the field, and they were collected, harvested, detached, single-tanned, and stored in a single storage. The seeds selected by field panicles have a better yield-increasing effect, generally increasing the yield by 35% to 38% and the purity by 23.3%. Selection of the best part of the plant for planting has a physiological positional effect due to the nutrient supply of the plant. Therefore, the quality of seeds in different parts of the plant is different. The suitable crops for different crops are: the upper part of the wheat ear; the seeds of the lower and middle pods of the main axis of the rape; the middle and upper seeds of the main stem of the rice; the middle and lower seeds of the corn ear; the top of the sorghum ear; the upper part of the millet ear; Seeds of cotton bolls; sweetpotato potato potato seedlings; middle and lower grains of sesame spindles; cucumbers with seeds from the second to third fruit segments. The use of seeds at the most suitable site for seed retention can increase the yield by 15% to 26%. Therefore, in addition to the selection of typical fine plants, the seeds of the optimum plant parts should be selected for seeding when the strains are reserved. Particle selection through grain selection can not only effectively remove all kinds of alien seeds, improve seed purity, but also leave full, robust and seed-free seeds. Grain selection can significantly increase the seed germination rate and germination potential. The grain selection method includes wind dressing, screening, and mortar water selection. The seeds with uniform color, grain shape, uniform size, and full of disease are selected for seed selection. Seed Storage The storage of seeds is mainly to prevent moisture, mildew, insects, and boring. The specific measures are: turning the sun before seed storage, reducing water content, killing pests and diseases. During storage, a small amount of vegetables, seeds and melons are put into a cloth bag, and a seed tag is placed on the external or inside of the bag to indicate the name of the seed, the name of the seed, the number of seeds, etc., and it can be hung in a ventilated and dry place under the eaves. The field crops are suitable for storage in tanks (cannot be sealed in film bags), the dried seeds are placed in the tanks, the seeds are placed in the labels, and they are put into the bag with seeds and put into the seeds to achieve insect repellency. the goal of. Then use several layers of clean rags to hold the cylinder ports, and store the cylinders in a dry, cool and ventilated place.