. Among School Gardens . Device for Experiments with Soil are placed to the same height in the porosity of different soils is shown by therapidity with which the same amount of waterpoured in each chimney passes through its con-tents, and their power of absorption by the amountabsorbed in passing. The capillarity of the soilmay be shown by reversing the experiment, and q8 SOIL FERTILITY with the ends of the chimneys resting in water,allowing the water to creep up through the drysoils. Notice how long it will take water to creepup through six inches of good soil; how long topass do
. Among School Gardens . Device for Experiments with Soil are placed to the same height in the porosity of different soils is shown by therapidity with which the same amount of waterpoured in each chimney passes through its con-tents, and their power of absorption by the amountabsorbed in passing. The capillarity of the soilmay be shown by reversing the experiment, and q8 SOIL FERTILITY with the ends of the chimneys resting in water,allowing the water to creep up through the drysoils. Notice how long it will take water to creepup through six inches of good soil; how long topass down through it. The modification of the porous quality of soilsis accomplished by the same means used in chang-ing clay to sandy soils or the reverse. The capil-larity of soils is modified by these same changeswhich make the soils more close or open, as maybe required. But in the best of soils, capillarityhas to be checked so as to keep down near theroots the ground moisture and to prevent its riseto the surface and its e
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Keywords: ., bookcentury1900, bookdecade1910, bookidamongschoolg, bookyear1911
