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<blockquote data-quote="Ranchcop" data-source="post: 173649" data-attributes="member: 2751"><p>Terms</p><p>By legal definition, the term fertilizer refers to a soil amendment that guarantees the minimum percentages of nutrients (at least the minimum percentage of nitrogen, phosphate and potash). </p><p></p><p>An organic fertilizer refers to a soil amendment derived from natural sources that guarantees, at least, the minimum percentages of nitrogen, phosphate, and potash. Examples include plant and animal by-products, rock powders, seaweed, inoculants, and conditioners. These are often available at garden centers and through horticultural supply companies. </p><p></p><p>The term soil amendment refers to any material mixed into a soil. A mulch refers to a material placed on the soil surface. By legal definition, soil amendments make no legal claims about nutrient content or other helpful (or harmful) affects it will have on the soil and plant growth. In Colorado, the term compost is also unregulated, and could refer to any soil amendment regardless of active microorganism activity.</p><p></p><p>Many gardeners apply organic soil amendments, such as compost or manure, which most often do not meet the legal requirements as a fertilizer but add small amounts of nutrients. </p><p></p><p>Organic products require the activity of soil microorganisms before nutrients are available for plant uptake. This period is known as the release time. Microorganism activity is dependant on soil temperatures greater than 50 degrees F in the presence of sufficient soil moisture. Dry and/or cold soil conditions will delay the release of nutrients from these organic sources. This period refers to how long these products are available if applied to the soil. Use this information to time the application of the product.</p><p></p><p></p><p>Application refers to different products being applied in various ways. Some may be tilled in (worked into the soil with a machine or hand tool), others may be applied as a foliar spray (mixed with a surfactant and sprayed in a fine mist on the leaf surface while temperatures are below 80 degrees F), and some may be injected into a drip or overhead irrigation system (fertigation with a siphon mixer). Application rates in this fact sheet are generalized and based on some manufacturers' recommendations. Over or under fertilization may occur using these recommendations.</p><p></p><p>See soil and fertility resources at <a href="http://tp://www.ext.colostate.edu/pubs/crops/pubcrop.html" target="_blank">tp://www.ext.colostate.edu/pubs/crops/pubcrop.html</a> for information on how to take a soil sample, interpret soil test results, guidelines for fertilizing vegetables, and best management practices for N and P fertilization.</p><p></p><p>1D. Whiting, Colorado State University, Cooperative Extension consumer horticulture specialist and Colorado Master Gardener coordinator; C. Wilson, Extension horticulture agent, Denver County; and A. Card, Extension agriculture/4-H agent, Boulder County. 11/05. </p><p></p><p>Colorado Master Gardener training is made possible, in part, by a grant from the Colorado Garden Show, Inc. </p><p></p><p>Go to top of this page.</p><p></p><p>Updated Thursday, December 01, 2005.</p></blockquote><p></p>
[QUOTE="Ranchcop, post: 173649, member: 2751"] Terms By legal definition, the term fertilizer refers to a soil amendment that guarantees the minimum percentages of nutrients (at least the minimum percentage of nitrogen, phosphate and potash). An organic fertilizer refers to a soil amendment derived from natural sources that guarantees, at least, the minimum percentages of nitrogen, phosphate, and potash. Examples include plant and animal by-products, rock powders, seaweed, inoculants, and conditioners. These are often available at garden centers and through horticultural supply companies. The term soil amendment refers to any material mixed into a soil. A mulch refers to a material placed on the soil surface. By legal definition, soil amendments make no legal claims about nutrient content or other helpful (or harmful) affects it will have on the soil and plant growth. In Colorado, the term compost is also unregulated, and could refer to any soil amendment regardless of active microorganism activity. Many gardeners apply organic soil amendments, such as compost or manure, which most often do not meet the legal requirements as a fertilizer but add small amounts of nutrients. Organic products require the activity of soil microorganisms before nutrients are available for plant uptake. This period is known as the release time. Microorganism activity is dependant on soil temperatures greater than 50 degrees F in the presence of sufficient soil moisture. Dry and/or cold soil conditions will delay the release of nutrients from these organic sources. This period refers to how long these products are available if applied to the soil. Use this information to time the application of the product. Application refers to different products being applied in various ways. Some may be tilled in (worked into the soil with a machine or hand tool), others may be applied as a foliar spray (mixed with a surfactant and sprayed in a fine mist on the leaf surface while temperatures are below 80 degrees F), and some may be injected into a drip or overhead irrigation system (fertigation with a siphon mixer). Application rates in this fact sheet are generalized and based on some manufacturers’ recommendations. Over or under fertilization may occur using these recommendations. See soil and fertility resources at [url=tp://www.ext.colostate.edu/pubs/crops/pubcrop.html]tp://www.ext.colostate.edu/pubs/crops/pubcrop.html[/url] for information on how to take a soil sample, interpret soil test results, guidelines for fertilizing vegetables, and best management practices for N and P fertilization. 1D. Whiting, Colorado State University, Cooperative Extension consumer horticulture specialist and Colorado Master Gardener coordinator; C. Wilson, Extension horticulture agent, Denver County; and A. Card, Extension agriculture/4-H agent, Boulder County. 11/05. Colorado Master Gardener training is made possible, in part, by a grant from the Colorado Garden Show, Inc. Go to top of this page. Updated Thursday, December 01, 2005. [/QUOTE]
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