A reja on methods and procedures for soil aeration and its calculation. Includes topics like aeration schemes and methods, air exchange in the soil, controlling air consumption, and more Reja 1.Shaxtani shamollatish sxemalari va usullari. 2.Havo struyasi yo’nalishi va shaxtani  shamollatish uchasykalariga bo’lish. 3.Havoning sirqib chiqishi va unga  qarshi kurash tadbirlari 4.Havo sarfini boshqarish