Supply and Use: Water is the major limiting factor for worldagricultural production. Crops require and transpire massiveamounts of water. For example, a corn crop that produces about7000 kg ha of grain will take up and transpire about 4.2 millionL ha of water during its growing season ().To supply this much water to the crop, assuming no use ofirrigation, not only must 10 million liters (1000 mm) of rainfall per ha, but it must be reasonably evenly distributed duringthe year and especially during the growing season.
Africa and several countries in the Middle East, especiallyIsrael and Jordan, as well as other countries, are depletingfossil groundwater resources. China has severe agriculturalproblems (). In China, ground waterlevels are falling as much as 1 m yr in major wheat and corngrowing regions of the north China Plain ().Tianjin, China, reports a drop in ground water levels of 4.4 m yr(), while in southern India,groundwater levels are falling 2.5 to 3 m yr; in the Gujarataquifer depletion has induced salt contamination ().
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Cornell college of agriculture and life sciences essay …
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