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  2. Kjeldahl method - Wikipedia

    en.wikipedia.org/wiki/Kjeldahl_method

    Total Kjeldahl nitrogen or TKN is the sum of nitrogen bound in organic substances, nitrogen in ammonia (NH 3-N) and in ammonium (NH 4 +-N) in the chemical analysis of soil, water, or waste water (e.g. sewage treatment plant effluent).

  3. Nitrogen-15 tracing - Wikipedia

    en.wikipedia.org/wiki/Nitrogen-15_tracing

    Nitrogen-15 (15 N) tracing is a technique to study the nitrogen cycle using the heavier, stable nitrogen isotope 15 N.Despite the different weights, 15 N is involved in the same chemical reactions as the more abundant 14 N and is therefore used to trace and quantify conversions of one nitrogen compound to another.

  4. Controlled-release fertiliser - Wikipedia

    en.wikipedia.org/wiki/Controlled-release_fertiliser

    A nitrogen stabilizer is a substance added to a fertilizer which extends the time the nitrogen component of the fertilizer remains in the soil in the urea-N or ammoniacal-N form. Nitrification inhibitor: A substance that inhibits the biological oxidation of ammoniacal-N to nitrate-N.

  5. Wastewater quality indicators - Wikipedia

    en.wikipedia.org/wiki/Wastewater_quality_indicators

    The main parameters in sewage that are measured to assess the sewage strength or quality as well as treatment options include: solids, indicators of organic matter, nitrogen, phosphorus, indicators of fecal contamination. [1]: 33 Tests selected vary with the intended use or discharge location. Tests can measure physical, chemical, and ...

  6. Soil test - Wikipedia

    en.wikipedia.org/wiki/Soil_test

    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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    Having produced a stunning defensive display to beat the Los Angeles Chargers in the wild-card round of the playoffs, the Houston Texans get the unenviable task of traveling to Arrowhead Stadium ...

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  9. Dumas method - Wikipedia

    en.wikipedia.org/wiki/Dumas_method

    In analytical chemistry, the Dumas method is a method of elemental analysis for the quantitative determination of nitrogen in chemical substances based on a method first described by Jean-Baptiste Dumas in 1826. [1]

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