A Comparative Study on Environmental Impacts of Using Pelleted High-quality Organic Fertilizer and Chemical Fertilizer in Rice Production Systems
Keywords:
environmental impact, chemical fertilizer, organic fertilizer, rice, sugar industrial by productAbstract
Strategic use of fertilizers is one of the most important approaches to improve productivity of rice faming. Fertilizer types, and rates and methods of application lead to degree of environmental impacts. The present research aimed to compare the environmental impacts of rice farming systems that received either chemical fertilizers or high-quality organic fertilizers using a cradle-to-farm gate Life Cycle Assessment (LCA) approach. Four environmental indicators used comprised climate change (CC), Acidification Potential (AP), Freshwater Eutrophication Potential (FEP) and Marine Eutrophication Potential (MEP). Results showed that rice applied with chemical fertilizers obtained more nitrogen and phosphorus minerals at approximately 6 and 3 folds, respectively compared with the rice received organic fertilizers. However, fertilizer regimes had no effects on grain yield (kg/rai) and the CC indicator (P>0.05). In contrast, the use of organic fertilizers led to lowering the AP, FEP and MEP indicators (P<0.05). In conclusion, the use of organic fertilizers in rice production systems does not negatively affect grain production but reduce some environmental impacts.
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