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2. Green manure - Wikipedia

   en.wikipedia.org/wiki/Green_manure

   Depending on the species of cover crop grown, the amount of nitrogen released into the soil lies between 40 and 200 pounds per acre. With green manure use, the amount of nitrogen that is available to the succeeding crop is usually in the range of 40-60% of the total amount of nitrogen that is contained within the green manure crop. [5]

3. Cover crop - Wikipedia

   en.wikipedia.org/wiki/Cover_crop

   Cover crops can increase microbial activity in the soil, which has a positive effect on nitrogen availability, nitrogen uptake in target crops, and crop yields. Cover crops reduce water pollution risks and remove CO2 from the atmosphere. [1] Cover crops may be an off-season crop planted after harvesting the cash crop.

4. Sanitary manhole - Wikipedia

   en.wikipedia.org/wiki/Sanitary_manhole

   The heights of the chimney can vary and as they are used to make the manhole cover to flush with the ground. [15] Grade adjustment rings can also be used on top of a cone section instead of the chimney section to adjust the frame to the required level. [20] The cover section is the top most section of sanitary manholes.

5. Carbon-to-nitrogen ratio - Wikipedia

   en.wikipedia.org/wiki/Carbon-to-nitrogen_ratio

   A carbon-to-nitrogen ratio (C/N ratio or C:N ratio) is a ratio of the mass of carbon to the mass of nitrogen in organic residues. It can, amongst other things, be used in analysing sediments and soil including soil organic matter and soil amendments such as compost .

6. Corn smut - Wikipedia

   en.wikipedia.org/wiki/Corn_smut

   This is not the best practice, though, because corn smut can also overwinter in the soil; crop rotation is recommended. Lastly, as excess nitrogen in the soil augments infection rate, using fertilizer with low nitrogen levels, or just limiting the amount of nitrogen in the soil proves to be another way to control corn smut. [20]

7. Labeling of fertilizer - Wikipedia

   en.wikipedia.org/wiki/Labeling_of_fertilizer

   Fertilizers are usually labeled with three numbers, as in 18-20-10, indicating the relative content of the primary macronutrients nitrogen (N), phosphorus (P), and potassium (K), respectively. More precisely, the first number ("N value") is the percentage of elemental nitrogen by weight in the fertilizer; that is, the mass fraction of nitrogen ...