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You can also use the calculator to view specific costs of goods and services between two geographic areas. For instance, bread costs $4.27 in the metro Washington, D.C. area but only $3.76 in ...
A soil test is a laboratory or in-situ analysis to determine the chemical, physical or biological characteristics of a soil. Possibly the most widely conducted soil tests are those performed to estimate the plant-available concentrations of nutrients in order to provide fertilizer recommendations in agriculture.
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Carlson's index was proposed by Robert Carlson in his 1977 seminal paper, "A trophic state index for lakes". [3] It is one of the more commonly used trophic indices and is the trophic index used by the United States Environmental Protection Agency. [2]
The cost of natural gas makes up about 90% of the cost of producing ammonia. [125] The increase in price of natural gases over the past decade, along with other factors such as increasing demand, have contributed to an increase in fertilizer price.
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