. Agriculture for southern schools. andy soils. — A sandy soil is usually awarm soil for the reason that sand absorbs heat reason is because it is well drained, there beingbut little water left in it to be heated, thus allowing thesuns heat to be used to warm the soil grains. This kindof soil, therefore, is one well suited to early also thrive on sandy soils and cotton is bettersuited to them than is corn. This is because cotton isless injured than corn by a scarcity of soil moisture. Asandy soil is usually not good for wheat nor for haygrasses, but the finer
. Agriculture for southern schools. andy soils. — A sandy soil is usually awarm soil for the reason that sand absorbs heat reason is because it is well drained, there beingbut little water left in it to be heated, thus allowing thesuns heat to be used to warm the soil grains. This kindof soil, therefore, is one well suited to early also thrive on sandy soils and cotton is bettersuited to them than is corn. This is because cotton isless injured than corn by a scarcity of soil moisture. Asandy soil is usually not good for wheat nor for haygrasses, but the finer grades of tobacco are grown on certain kinds of tobacco the soils of the Southernstates shown on soil maps as Orangeburg fine sandy 6i 62 AGRICULTURE loam are especially suited. Peanuts, sweet-potatoes,cowpeas, and watermelons are good crops for sandy uses for clay soils. — Since clay soils contain somuch water, they arc slow in warming in the spring. Youknow that if you dip your hand in water, even in rather. From Fletchers Suils. Doulileday, Page & Co. Fig. 42. — A Hillside too Steep fok CultivationIt should be used for pasture or forest. warm water, and then expose it to the air, the skin becomescool. This is because evaporation of water (that is, thechanging of water from a liquid into the form of a gas orwater vapor) has required heat and has drawn this heatfrom the skin. In a stiff clay soil much of the water mustbe evaporated from the surface. This uses the heat thatought to be used in warming the soil. Hence a clay soilis a cold soil, and crops growing in it start late. SUITING THE CROP TO THE SOIL 63 Clay soils are moist, and therefore the best crops forthem are those requiring much water. As shown in anearlier chapter, a crop of hay requires an immense amountof water. Timothy grass, Johnson grass, red clover, andmost hay plants, therefore, do well on clay soils. Applesneed plenty of water and accordingly thrive on the bestgrades of clay soil.
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