a biological approach to soil fertility Biological Approaches to soil renewal Our first task in an earnest effort at Earth Restoration must be to revive worn-out, mineral depleted, biology-deficient soils. Without healthy, balanced, fertile soil able to supply a full menu of minerals and microbes, the land cannot support lush vegetation and abundant animal life. Without soil renewal, all efforts at ecological repair and restoration will fail. Humans must become true stewards of the soil. We must renew the Natural World from the ground up by combining traditional methods of land conservation with new effective technologies to make new topsoil, fertile enough to sustain rapid, intensive restoration of the diversity of biological life—especially grasses and prairies, and trees and forests. Bedrock into Biology
To restore topsoil, our first action must be to assure an abundant supply of essential elements. These elements are supplied in the form of "minerals"—complex combinations of chemical elements. Minerals are usually metals combined with oxygen,
Soil is made from rocks. Soil is decayed rock. Rocks are weathered and worn by wind and water into dust, grit and sand. The raw, elemental minerals exposed by this breakdown are then digested, reformed and transformed by microbes, algae, lichen and other simple lifeforms. The simplest organisms perform the primary task of transforming minerals into protoplasm.
Plants then combine these carbon-bound soil minerals with sunshine, water and carbon dioxide to create sugars, the universal fuel for biological life. Through the miracle of photosynthesis, magnesium in chlorophyll liberates oxygen and sunshine is captured in carbohydrates. As in the chlorophyll molecule itself, the minerals form the heart of biological cells, and supply the electric charges required to fire nature's chemical reactions. Rocks are not equal in their ability to provide nutrients. Some rocks consist of only a few elements; others contain a wide diversity of elements. Some rocks contain too many heavy metals, others consist of a wide diversity of trace elements. Some rocks contain an abundance of silica; others consist mainly of clay-forming minerals. Determining what rock is best to renew one type of soil or soil condition becomes complex and fraught with technical uncertainties, unknowns and uncontrolled variables.
General recommendations are to grind rocks to at least 200 mesh, which is finer than fine sand. Several successful rockdust fertilizers are 400 mesh or less—as fine as talcum powder. One new product —Summa Minerals—will pass 22% through a 2500 mesh screen. These finely ground dusts can be difficult to handle, cake up when wet, and easily disburse on windy days. A few manufactureres have granulated or pelletized their products to make them easier to handle and spread with a mechanical spreader. Rocks are not equal in their ability to provide nutrients. Some rocks consist of only a few elements; others contain a wide diversity of elements. Some rock contains too much heavy metal, others consist of a wide diversity of trace elements. Some rocks contain an abundance of silica; others consist mainly of clay-forming minerals. For maximum vitality, it's important to supply soil with ALL the nutrients that are essential for plant and animal growth. Not merely the organic elements and major elements—Nitrogen, Phosphorus, Potassium, and Calcium (N-P-K and Ca)—but all the elements, especially the trace elements.
There are at least a dozen other elements, beyond the major seven, that science now knows are needed for healthy plants. Many more—such as molybdenum—needed by specialized soil microbes, which fulfill special functions to create soil and fertility, such as synthesizing certain enzymes, vitamins, antibiotics, or other critical biolmolecules. Most are required in extremely tiny amounts—micrograms or less—and thus are called "trace elements." Most trace elements dissolve into water faster than the major elements. So, in an average soil, trace elements leach out of soils faster than major elements. This removal of trace elements is accelerated by acid rain, soluble chemical fertilizers and excessive tillage. The consequence is that all soils eventually and easily become deficient in minor or trace elements. Continued doses with N-P-K and lime fertilizers will not resolve these deficiencies, and, in fact, will make them worse. Trace elements play a key role in the function of many enzymes and hormones. One consequence of this is that a very tiny amount trace element has an exceedingly great effect on the healthy function of plants and animals. For example, it is well-known that insuffient iodine will induce goiter, a disease of the thyroid gland. And a deficiency of cobalt will leave us without vitamin B12, and thus unable to manufacture red blood cells. Neither is needed in more than a microgram per day—an amount which will easily fit on the head of a pin. Home | Membership | Earth Charter | Climate Change | Champion Trees | Ancient Forests | Topsoil | Water | Healing | Peace | Links The Earth Renewal and Restoration Alliance — www.championtrees.org — updated 12/31/2005 |