Land as a resource essay in 100-150 words
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Answer:
Land or soil is one of the natural bases for human life and social development. Soils are defined and characterized on the basis of their morphological profiles because the assemblage of obvious physical features represented by these units are often related to the less obvious features of their chemical composition, chemical properties, and fertility.
Men have tilled the soil and irrigated and drained it for at least six millennia. This is basic to civilization. Systematic scientific study of agriculture began in the first half of the nineteenth century, along with physical studies of the soil. In its natural state, the soil is normally a three-component porous medium consisting of solid soil particles, water, and air. Much of the water involved in the hydrologic cycle is located in soil between the time of its arrival as rain at the soil surface and that of its return to the atmosphere. The processes of water movement in soil play a central part in the scientific study of the terrestrial sector of the hydrologic cycle and in the problems of dry-land and irrigated agriculture, of plant ecology, and of soil biology. These determine the transport of materials in solution such as natural salts, fertilizers, and urban and industrial wastes through the soil. Properties such as infiltration, drainage, and retention of water in the soil layers; extraction of water by plant roots; and the evaporation of water from the soil are also important.