Page 25 - The Chemistry and Fertility of Soils Under Tropical Weeds Book_Neat

12 The Chemistry and Fertility of Soils under Tropical Weeds

2-
SO 4
NUTRIENTS

SOIL MICROORGANISMS PLANTS
(DECOMPOSERS) (PRODUCERS)

ARYLSULPHATASE

ANIMALS
ORGANIC S
(CONSUMER I)

ANIMALS
(CONSUMER II)

Fig. 1.8. The cycle of S in the soil – plant system
(Salam, 2014).

N 2

NH 3
NH 4 +
NO 2 -

(Fixation/Decomposition)
Microorganisms NO 3 -
PROTEASE
S
Plants
Organic N

(Protein) (Proteins)
Animals/ Plants
Humans

Fig. 1.9. The N Cycle (Adapted from Salam, 2014).

Abdul Kadir Salam and Nanik Sriyani – 2019