Page 10 - soil-plant-water relationship and water requirement
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SOIL-PLANT-WATER RELATIONSHIP AND WATER REQUIREMENT
CHAPTER 1
1.0 HYDROLOGICAL CYCLE IN AGRICULTURE
Water is the lifeblood of the earth. Water distribution, on the other hand, is highly uneven;
some areas have a lot of it, while others have very little. On Earth, water exists as a solid (ice),
a liquid, or a gas (water vapor). Oceans, rivers, clouds, and rain, which all include water, are
always changing (surface water evaporates, cloud water precipitates, rainfall infiltrates the
ground, etc.). However, the overall amount of water on the planet remains constant. The
"hydrologic cycle" refers to the movement and conservation of water on the earth.
The hydrologic cycle is a model that explains how water is stored and moved through the
biosphere, atmosphere, lithosphere, and hydrosphere.
Water is constantly circulated between the reservoirs. Precipitation, run-off, infiltration, deep
percolation, evaporation, transpiration, and groundwater flow all contribute to this cycle.
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