39 Experiments in Soils

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Object. Capillary water refers to that water which passes through a soil due to the attraction which the soil grains have for the water. The oil which passes through a lamp wick is a very good example of capillarity. The oil passes upward because the wick attracts and holds it. Water passes up through a soil in the same manner and this moisture is the most impor- itant source of supply for plants. The rate that capillarity will act deter- mines the power of the soil to obtain water from the sub
...soil, and this in large measure determines the value of the soil. To show capillarity pro- ceed as directed below: Apparatus. Four percolation bottles, a pan about two inches deep and twelve inches long (if this is not to be had. small pans may be used), per- colation rack, four kinds of soil, cheese-cloth and string.
C- Procedure. Take four percolation bottles and cover the mouth of each ' with cheese-cloth or plug them with cotton. Fill each with a different kind of soil. Clay, sand, loam, and humus are good ones to use.


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