Page 90 - Enzymes in Tropical Soils

78 Enzymes In Tropical Soils

was also reported that the activities of enzymes including dehydrogenase, urease,
and phosphatase in North East India were higher in the undisturbed regions than
those in the regions that have been degraded due to higher populations of fungi
and bacteria in undisturbed regions (Jha et al., 1992).

Table 5.10. The effect of land-use conversion on soil organic C and total N
contents in Bukit Ringgis West Lampung Indonesia*.

Soil Depth Organic C Total N
-1
-1
(cm) (g kg ) (g kg )
Primary Forest 0 – 20 60.4 5.5
20 – 40 25.0 2.3
Secondary Forest 0 – 20 41.4 3.4
20 – 40 21.7 2.0
Coffee Plantation 0 – 20 28.5 2.3

20 – 40 10.1 1.2
Cultivated Land 0 – 20 15.8 1.7
20 – 40 7.5 0.8
*Adapted from Salam et al. (1998d)

Table 5.11. The changes in soil phosphatase activity as
affected by soil tillage*.

-1
Urea N (kg ha )
Soil Tillage 0 100 200
-1
-1
....... mg p-Nitrophenol g h .......
Intensive Tillage 157 142 140
Minimum Tillage 187 174 173
No Tillage 169 163 181
Average 171 160 165

*Adapted from Salam et al. (1998c)

Abdul Kadir Salam - 2014