over 50°C. Most nitrificators are aerobic, their growth and development claims good soil aeration. The most active nitrification processes run in porous soils with particles sized 2-10 mm. Soil cultivation and ploughing helps aeration. Soil humidity under 25-30% suppressed nitrification. Levels of radiation from fission products deposited in the soil by fallout in the northern hemisphere are about % of those due to natural radioactive substances in the soil. Many authorities feel that there is very little evidence to date to show that this increase in
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