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EFFECT OF SUB-BITUMINOUS COAL ON NEGATIVE CHARGE ACTIVITY ON SECONDARY FOREST AND HORTICULTURAL LAND CONTAMINATED WITH PESTICIDES IN SUNGAI PUA, AGAM
Pesticides are increasingly used to deal with crop-disrupting organisms.However, only 1% are on target, and the rest threaten agriculturalecology. This research aims to study the effect of Sub-bituminous coal(SC) on the change of negative charge activity (NCA) on two typesof land, namely secondary forest (SF) and pesticide-contaminatedhorticultural land (HL-P). Two studies respectively used a completelyrandomized design (CRD) with three replications on two land typesand five doses, namely: A = control or 0 t/ha [0 g SC/500 g soil]; B= 10 t/ha [2.5 g SC/500 g soil]; C = 20 t/ha [5.0 g SC/500 g soil]; D= 30 t/ha [7.5 g SC/500 g soil]; and E = 40 t/ha [10 g SC/500 g soil].The results show that the effect of 40 t/ha SC can increase NCA onthe surface of soil colloids (ΔpH) by 43% in SF and 23% in HL-P. Theeffect of 40 t/ha SC on the two types of land has a significant effecton increasing pH H2O, EC, CEC, and OM composition, respectively,by 0.70; 0.04 dS/m; 44.30 cmol(+)/kg and 7.60% in SF and 0.33; 0.01dS/m; 26.89 cmol(+)/kg and 3.00% in HL-P, compared to the control.
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