At present, the comprehensive utilization of crop stalks mainly has five ways: first, as agricultural fertilizer; second, as feed; third, as a new energy source in rural areas; fourth, as an industrial raw material; and fifth, as a base material. As a fertilizer, corn stalk returning is an effective method for replenishing and balancing soil nutrients and improving soil. It is one of the basic measures for the construction of high-yielding fields. After straw is returned to farmland, the average yield increase per mu is above 10%. The biggest problem with straw returning is that it is difficult to plow straw into the soil. Even if the stalks are successfully ploughed into the soil, problems may arise in the formation of straw strands in the furrows, ie decomposition cannot be carried out at a sufficient rate and the soil surface will be exposed during the next tillage. In addition, the straw strands in the furrows will also hinder the growth of the roots of the crop to deeper layers of the soil. As feed, corn stalks are rich in non-starch macromolecular substances such as cellulose, lignin, and hemicellulose. As roughage has low nutritional value, it must be processed. Treatment methods include physical methods, chemical methods, and microbial fermentation methods. After straw treated by physical and chemical methods, its palatability and nutritional value have been greatly improved. Preservation tubes are swabs with disposable virus sampling tubes to collect DNA tests for disposable nasal flocking sterile medical transport. swabs with disposable virus sampling tubes , to collect DNA tests for disposable nasal flocking sterile medical transport. Jiangsu iiLO Biotechnology Co., Ltd. , https://www.iilogene.com