highest was also the content of nitrates and nitrites in all parts of the plant in maize from areas treated with herbazine-50 at the rate of 4 kg of a. i. per hectare as well as with artificial nitrogen fertilizers ( ammonium nitrate and superphosphate at 450 kg/ha ) , followed by maize obtained from areas where ammonium nitrate and superphosphate at 450 kg/ha were introduced only .
C0028125
nitrates
C0051722
ammonium nitrate