By E. J. Winter (auth.)

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Sykes, D. J. (1969). Turrialba, 19,4. The Soil Reservoir 43 continuous column of water bridging the soi I particles and th is sets up a simple hydrostatic negative pressure or suction. When this column ends at a water table where there is free water at maximum potential or minimum suction this limitation of its length obviously limits the total suction exerted on the saturated soil above; thus the suction to which a freely draining saturated soil is subject depends on many factors. It is certainly not the same for all soi Is and all cond itions.

CHAPTER 3 THE SOIL RESERVOIR Soil is a complex mixture of inorganic and organic material usually containing a rich variety of living and dead organisms including bacteria, fungi, both uni- and multicellular nematodes, molluscs, insects, annelids and higher animals; soil provides anchorage and support for larger plants which extract from it their nutrient and water requirements. The thickness of the soil layer ranges from nil in deserts, steep slopes and high mountains to hundreds of feet in the ancient peat swamps of Assam.

25 per cent (data of J. H. Williams, lac. ) The hazards of irrigating with water containing sodium chloride, such as brackish estuarine water, are associated with both anions and cations. Chloride harms the plants while sodium damages the soil structure especially of soils with high clay content, or silts and silty loams. ASSESSING WATER SUPPLIES Measuring stream flow Surprisingly large quantities of water can be abstracted from apparently insignificant streams provided that they flow continuously.

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