Peat, water and humic acid used as carriers were inoculated with the associated nitrogen-fixing engineered bacteriaEnterobacter gergoviae-7(E7).After the inoculants were stored at room temperature for 5 d, the E7 numbers in inoculants were increased obviously. After one month the E7 numbers in inoculants decreased slightly; and after two months fell rapidly. Six months later, the E7 numbers〔n(CFU)〕 in inoculants decreased to 5.0×10 6~93.0×10 6 g -1. The survival regularization of E7 in three inoculan...