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By Barton E. Worthington

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The main factor in the regulation of the salt balance is effective drainage of saline groundwater. Land under irrigation may deteriorate through a rise in the groundwaters so as to cause waterlogging, through salinization (whether due to high salinity of the groundwater or the dissolving of solid face salts in the root zone in the way of rising fresh groundwater), and through alkalinization. Especially difficult problems arise in the case of secondary soda salinization (alkalinization). The mechanism of oversaturation easiest to regulate is the removal of salts with drainage waters.

Thus, the establishment of conservation areas within or adjacent to irrigation schemes are important for several reasons: (1) For scientific reasons. , by a center of higher education in the vicinity, so as to establish a biological "bench mark" against which to measure changes elsewhere. (2) For teaching and training. Outdoor education whether of young or of adults is of growing importance in all countries, and this should be especially so among farm­ ing communities whose work consists of cooperating with natural processes.

056 mg/1. However, DDT accumu­ lates in high quantities in fish, and gets to man who uses fish as food. Evidence seems to suggest that contamination of water with pesticides is more the result of direct application to water than through agricultural runoff. Subsurface waters do not appear to provide direct routes into rivers and reservoirs. Generally, pesticides are believed to persist longer in water than in soils, and it is probable that most pesticides are readily absorbed onto soil particles.

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