Discussion
Denitrification losses of nitrogen in rice can be prevented by placing ammonical fertilizers in the
Answer: B
Ammonical fertiliser should be placed in the reduced zone.
A flooded rice soil develops two layers: a thin oxidised layer of a few millimetres at the surface, where oxygen from the floodwater is present, and the reduced zone below it, which is oxygen-free. Ammonium placed in the oxidised layer is nitrified to nitrate, and that nitrate then moves down into the reduced zone, where denitrifying bacteria convert it to nitrogen gases that are lost.
If the ammonium is placed deep in the reduced zone, for example as urea super granules, it stays as ammonium, is held on the soil colloids and is not nitrified, so denitrification loss is avoided. 'Calcified' and 'hydronized' are not recognised zones of a rice soil.
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