Re the sentence: "In the allophanic soil, the 30% plantain treatment had the lowest emission factor (EF3) (0.18 ± 0.04 %) while the lowest EF3 (0.34 ± 0.03 %) in the gley soil was from the 100% plantain treatment." 
I think it would be more informative to the reader to indicate which treatments had significantly lower EF3 values compared to the 0% treatment, rather than just say which was the lowest...

E.g. In the allophanic soil, the 30% (plus any other treatments as well?) plantain treatments had significantly lower emission factors (EF3) than the 0% plantain treatment, while in the gley soil, EF3 from the 100% (plus any others?) plantain treatments was significantly lower than that from 0% plantain.