PJB-2020-289
EFFECTS OF ORGANIC AMENDMENT BASED ON HUMIC ACID AND RUBBER BARK DUST ON MACRONUTRIENT AND HEAVY METAL CONTENTS IN SOIL
Dr. Muhammad Rendana
Abstract
Enormous use of chemical fertilizer generally gives negative impacts on soil quality. However, if we use the fertilizer along with organic amendment, it appears to be a good approach for sustainable agriculture. This study investigated the effect of organic amendment based on humic acid and rubber bark dust on heavy metal and macronutrient contents in soil. The organic amendment has major components such as humic acid and rubber bark dust, and small portion of clinoptilolite and kieserite minerals. Soil samples were collected from paddy field trials at Alor Senibong, Kedah, Malaysia. The experiment included several treatments: single chemical fertilizer or NPK treatment (CF) and the other two treatments with different organic amendment application amount such as 250 kg/ha (CF+OA250) and 500 kg/ha (CF+OA500). Soil organic matter content, pH, available P, available K, total N and heavy metal (As, Cd, Cr, Cu, Pb and Zn) contents were analyzed. Results show the single chemical fertilizer treatment shows no significant effect on soil organic matter content, pH, available P, available K and total N. The treatment of chemical fertilizer along with organic amendment significantly increases soil organic matter content, pH, available P, available K and total N. The addition of organic amendment reduces the concentrations of Cr, Cd, Cu and Pb in soil by forming complex compounds with humic acid. Rubber bark is also useful for increasing nutrient availability and improving nutrients retention. In conclusion, this study indicates that the application of organic amendment based on humic acid and rubber bark provide a good option to enhance soil quality for rice production.
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