We tested benefits of polyphenols of banana
pseudostem on soil
nitrification and biomass of pakchoi using a pot experiment.
The results showed that a series of PBP extracted from banana
pseudostem were capable of inhibiting transformation of - N, into - N. Compared with the control test, receiving N fertilizer two times higher than other treatments, at the 21st day, the contents of - N in other treatments were almost as same as the treatment, excluding the treatment of PBP4. At the 49th day, the treatments of PBP1- 3 could reduce the transformation of - N by 11.9% ～ 33.7% in the soil. Compared with other ordinary nitrogen- inhibitors, the treatments of PBP1- 3 could postpone seven days of forming perk for - N in the studied soil, and furthermore, PBP4 could also shortly retard the soil
nitrification before the 7th day. In the meantime, compared with the treatments of CK and the treatment with another nitrogen- inhibitor DCD, the series of PBP used in the present study could significantly increase the biomass of pot- planted pakchoi.