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The Chemistry and Fertility of Soils under Tropical Weeds 69
in relation to the decrease in soil C content (Table 4.6). Salam (1999) also report
that the availabilities of micronutrients in the same locations also decreased by
land-use conversion, in correlation with the decrease in soil organic C, total N, and
CEC (Salam, 1999). Salam et al. (1999b) also document that the available P
decreased by land-use conversion from bushes to sugarcane and pineapple
plantation (Table 4.7). The available P in bushes is higher than those in soils
monoculturally planted with sugarcane or pineapple.
Table 4.7. The available P in sugarcane and pineapple plantations
of Central Lampung Indonesia* (After Salam, 2014).
Period of Cultivation Available P
No -1
(Years) (mg kg )
A. Sugarcane Plantation:
1 0** 8.44
2 3 7.19
3 9 8.16
4 13 23.1
5 20 63.6
B. Pineapple Plantation:
1 0*** 199.0
2 5 3.17
3 10 3.17
4 15 11.0
5 20 21.5
*Adapted from Salam et al. (1999b); **Bushes adjacent to
plantations; *** newly opened
Similar phenomena were observed in the middle terrace of Lampung (Salam et
al., 1999a). The land-use conversion significantly changes the soil chemical
properties of soils (Table 4.8). Table 4.8 clearly shows that the soil organic C, CEC,
Abdul Kadir Salam and Nanik Sriyani – 2019
