In this study we focused on nitrification inhibition properties from tropical and subtropical plants; Acrocomia totai (palm tree) and Brachiaria humidicola (grass plant). Hexane extracted seed oil as well as dry powder of seed covers was applied in a quick nitrification bioassay for 24 or 50 hours to investigate their effects on nitrification process. Similarly B. humidicola shoot homogenates were applied in the same quick nitrification bioassay for their potential inhibitory effects on nitrification. Results showed that seed oil as well as seed covers from A. totai were significantly inhibited the nitrification rates in the quick nitrification bioassay test compared to distilled water control. In a separate experiment, it was found that shoots but not roots homogenates from B. humidicola grasses were efficiently retarded nitrification rates compared to water control. Therefore, including these plant genotypes together with main crops (intercropping) or as alternative crops, could effectively reduce soil nitrification process and leading to better Nutilization.
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Mohammad Kazem Souri (2016) studied this question.