Nitrapyrin at 50 ppm, increased dry weights of tomato ( Lycopersicon esculentum Mill.) and total N when pine bark comprised part of the medium and NH4 was part of the N treatment. If the medium consisted only of pine bark, nitrapyrin increased dry weights and total plant N with NO 3 –N and/or NH 4 –N treatments. The NO 3 –N level in the medium was higher with all N treatments when nitrapyrin was incorporated. The increase in plant growth is directly related to the higher NO 3 –N levels in each medium where nitrapyrin was incorporated. The higher media NO 3 –N with nitrapyrin are attributed to inhibition of the nitrification process and a subsequent inhibitory effect on NO 3 –N loss.
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Mills et al. (1978) studied this question.