Soil Nitrogen and Nitrogen Fertilizers
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Flashcards focusing on soil nitrogen and nitrogen fertilizers for exam preparation.
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11 Terms
Nitrogen is the most limiting nutrient; with its addition, get __ returns.
10-fold
Air is about __% (v/v) nitrogen gas.
78
Nitrous oxide (N2O) concentration in air is about __ ppm.
0.3
Ammonia (NH3) concentration is in the range of to .
ppm to ppb
Nitric oxide (NO) is formed during __ and is an important form of nitrogen loss.
combustion
Nitrogen dioxide (NO2) is often called __ gas.
silo
The most abundant form of nitrogen in the solution is __.
nitrate
Nitrite (NO2-) does not persist in soil and is quickly oxidized to __.
nitrate
Organic nitrogen comprises about to % of total soil nitrogen.
20-40
Kjeldahl nitrogen also includes organic forms of N and is referred to as __.
TKN (total Kjeldahl nitrogen)
Note 
Flashcards (39)