玉米秸杆直接还田就是把秸杆切碎后直接撒在地表或深翻到地下。这样,能增加土壤有机质,改善土壤的团粒结构,提高土壤的保肥保水性能,是保证农业稳产高产的一项重要措施。但直接还田方法使用不当,也会使作物生长发育受到不良影响。因此,玉米秸杆直接还田必须把住以下要点: (一)秸杆要切碎。把秸杆就地趁鲜铡成3—6厘米,或采用机械粉碎法,以免秸杆过长土压不实,影响作物出苗与生长。(二)足墒还田。秸杆还用时,由于秸杆本身吸水和微生物分解吸水,会降低土壤含水量,因此,要及时浇 Corn straw directly into the field after the straw is shredded directly sprinkled on the ground or deep into the ground. In this way, it can increase soil organic matter, improve the aggregate structure of soil and improve soil conservation and water retention, which is an important measure to ensure stable and high yield of agriculture. However, improper use of direct return to the field will also adversely affect crop growth and development. Therefore, the direct return of corn straw must live the following points: (A) straw to be chopped. Take advantage of fresh straw into the straw on the spot into 3-6 cm, or use mechanical crushing method, so as not to straw too long earth pressure false, affecting crop emergence and growth. (B) enough moisture to return to the field. Straw is also used, due to the straw itself to absorb water and microbial decomposition of water, will reduce the soil moisture content, therefore, to be timely