The soil urease, saccharase, and catalase were significantly positive correlated with soil pH and were significantly negative correlated with soil TN.
In this study, soil saccharase and alkaline phosphatase enzyme activities were affected by the intercropping treatment.
Saccharase activity was determined by 3,5-dinitrosalicylic acid colorimetry method using sucrose as the substrate.
The soil enzymes activities (urease, phosphatase, saccharase, and catalase) of CT, DT, and DNT treatments in loam and clay were shown in Figures 4, 5, 6, and 7.
The activity of soil urease (EC 18.104.22.168) was determined in dry samples according to the Hofmann & Schmidt (1953) method and that of saccharase (invertase) (EC 22.214.171.124) according to the Hofmann & Seegerer (1950) method (both methods cited in and modified by Chunderova, 1973).
(2008), soil saccharase activity is positively correlated with total nitrogen and available phosphorus, and urease activity is negatively correlated with the soil pH.