Inorganic additives generally are used in heavy clay soils to break up the soil structure and to allow greater penetration of air and water. You can utilize inert substances, which mechanically hold the particles apart, or chemical conditioners. (See Figure 2.05.)
Clay soil can be broken up by the addition of gypsum (calcium sulfate). Clay in its natural state generally becomes packed and airless because an excess of sodium in each clay particle strongly attracts water. As the water drains away, the particles are left tightly packed. Gypsum removes the sodium by exchanging the sodium ions for calcium ions. The clay particles are then soon separated into large crumbs with ample pore space. Gypsum should be spread on the soil surface at the rate of about 50 pounds per 1,000 square feet Sand added to clay will not improve it, will not prevent it from baking hard.
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By gardening organically, the dependence on chemicals is removed. By eliminating chemicals used in regular gardening, your vegetables will be healthier because they will get the nutrients by natural means. Unlike traditional gardening; organic gardening will help to prevent potentially harmful toxins from entering your body. Lastly, it is much more environmentally friendly.