생분해성 수지로 코팅된 수도용 완효성 비료 시용 시 벼 생육 및 온실가스 발생량 평가

Abstract

The non-biodegradable resins are used and increased every year with about 1,103 tonnes of non-biodegradable resins for the production of controlled release fertilizers since 2020. Hence, the objective of this study was to investigate the effect on paddy rice growth and greenhouse gas emissions by application of the controlled release fertilizer coated with a biodegradable polymer. This experiment was conducted in a paddy rice field, a farm affiliated with Seoul National University. The experimental design was the randomized complete block design method (RCBD) with 3 treatments to three replications. The treatment consisted of 1) non-fertilizer, 2) biodegradable coating fertilizer (31-6-8) with 30 kg/10a of application rates, and 3) the conventional farming practice (21-17-17) with 40 kg/10a of application rates. For the growth responses, there were no significant differences in leaf color, plant height, number of tillers, and yield components between the biodegradable polymer coating treatment and the conventional treatment. The cumulative CH4 and N2O emissions in the biodegradable coating polymer treatment were 91.25 kg/10a and 150.80 g/10a with 35.9% and 53.9% of mitigation rates, respectively, compared to the conventional treatment. Overall, application of biodegradable coating polymer fertilizer reduced 25% of the fertilized amount and 36.4% of greenhouse gas emissions (CO2-equiv.) with no reduction of yield during rice cultivation.