Teachers are categorized in four main classes in Bangladesh at University level. The ascending rank of teacher is Lecturer, Assistant Professor, Associate Professor and Professor. The initial position Lecturer is generally enrolled as the top student of the class. Master's degree is required for normal university level Lecturer.
Humus soil is soil made up of decayed organic material. Popularly, it refers to soil that is light in texture, dark brown or black in color, and sweet-smelling.
Aeration. Humus encourages an aerated soil consistency, based on its sponge-like qualities and mineral-bonding abilities. Tilled into the soil, humus bonds with tiny minerals within the soil to create bigger soil particles and these larger fragments allow small air pockets to form within the soil.