ความสามารถของดินชุดสระบุรีในการดูดซับสังกะสี และแคดเมียมภายหลังการเติมกากตะกอนน้ำเสียชุมชน ในพื้นที่ที่มีการปลูกผัก / อนุกูล สุธาพันธ์ = Capacity for adsorbtion of zinc and cadmium of Saraburi soil serie after addition of domestic sewage sludge in cultivated area / Anukoon Suthapan
The main objective of this study is to investigate the adsorption capacity of Zinc (Zn) and Cadmium (Cd) by adding the domestic sewage sludge (DSS) into Saraburi soil serie. The two rate: 20-metric tons DSS/hectare (20 DSS) and 80-metric tons DSS/hectare (80 DSS) were tested with Chinese kale (Brassica oleracea L.Var. alboglabra Bailey) and Cruciferae (Brassica compestris L.var. parachinensis Bailey) in cultivated area at Tumbol Thoong-noi, Amphoe Muang, Nakhon Pathom Province. Three replications of 3x6 factorial in randomized complete block design were applied based on fallow periods: 1) no fallow period, 2) a haft of fallow period, and 3) a fallow period. The results of the study showed that the amount of DSS adding into the cultivated soils significantly affect on the increasing of Zn and Cd adsorbtion (P<0.05). Zn adsorption capability from plants with addition of 20 DSS was higher than that of the addition of 80 DSS. Zn adsorption of soils for Cruciferae was higher than that of Chinese kale while Cd adsorption rates of Chinese kale was higher than of Cruciferae. However, Zn and Cd adsorption rates from 80 DSS added in cultivated soil for Cruciferae was higher than that for Chinese kale. The investigation of various periods of times left over after cultivated seasons showed that there were no effect on Zn and Cd adsorption capacity of no fallow period and a haft of fallow period compared to the permissible criteria of heavy metal contamination in cultivated soils set up by the commission of the European Communities and Canada. The Zn and Cd adsorption capacity of a fallow period for both 20 DSS and 80 DSS, however, were decrease. This can be concluded that adsorption capability of Zn and Cd in Saraburi soil serie related to the amount of the contaminated substances but there was uncertainty. The Chinese kale and Cruciferae productions of 20 DSS applications were increased in both first and second crop applications. While the highest production was from a fallow period.
