Effect of Oil Palm Fly Ash on Soil Properties and Yield of Sweet Corn in the Tropical Zone of Thailand
2017
Suan, Joseph Dal Khan | Datta, Avishek | Abdul Salam, P.
Disposal of oil palm fly ash (OPFA) into the environment causes environmental pollution. A field experiment was conducted to evaluate the effects of OPFA and mineral fertilizer on soil properties and yield of sweet corn. A total of six treatments were applied that included 2, 4, and 6 t ha –¹ OPFA, 200 kg ha –¹ nitrogen, phosphorus, and potassium (NPK), 100 kg ha –¹ NPK + 2 t ha –¹ OPFA as well as the control. A significant increase in soil pH and available P was observed with the sole OPFA treatments at 2, 4, and 6 t ha –¹, while a significant increase in exchangeable cations [K, magnesium (Mg)] was detected only at the 6-t ha –¹ OPFA treatment. The highest grain yield of 4220 kg ha –¹ was obtained at the 100-kg ha –¹ NPK + 2 t ha –¹ OPFA-treated plots, which was statistically similar with the grain yield of 3800 kg ha –¹ received at the 200-kg ha –¹ NPK-treated plots. The practical implication of this study is that OPFA can be used as a liming material to increase soil pH and it has a synergetic effect in combination with inorganic fertilizer.
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