Impact of Application of Slurry Composting-Biofiltration (SCB) Liquid Fertilizer on Yield of Red Pepper and Nitrogen Leaching
2018
Lim, T.J., Rural Development Administration, Jeonju, Republic of Korea | Park, J.M., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea | Kang, S.B., National Institute of Horticultural and Herbal Science, Seogwipo, Republic of Korea
The objective of this study was to assess application effects of slurry composting bio-filtration liquid fertilizer (SCB) on red pepper (Capsicum annuum L.) yield and nitrate leaching. A lysimeter experiment was conducted to evaluate the impact on the nitrate leaching and red pepper yield No N fertilizer, four application N rates of SCB (0, 103, 155, and 206 kg ha-¹) and a control treatment of chemical fertilizer (103 kg ha-¹). SCB were used as a basal fertilization and three top dressing doses of urea at the 35th, 60th, and 80th day after transplanting were applied. There was no significant different in red pepper yield among the SCB 100%, 150%, 200%, and CF 100%, though which was decreased in the No N fertilizer in 2008 and the No N fertilizer and the SCB 0% in 2009. The Increase of SCB liquid fertilizer application rates intensified the leached nitrate concentration and nitrate load. The leached N load in the SCB 100% was 193 kg ha-¹ in 2008 and 138 kg ha-¹ in 2009. However the leached N load in the SCB 150% and 200% were 236 and 274 kg ha-¹ in 2008 and 173 and 216 kg ha-¹ in 2009, respectively which were higher 43 and 80 kg ha-¹ in 2008 and 38 and 78 kg ha-¹ compared to that in the SCB 100%. Meanwhile, the SCB 100% did not increased the nitrate leaching compared with the CF 100% though the leached N load was higher in the SCB 100% in early season of red pepper cultivation. Therefore, the application of SCB rates equivalent to N recommendation for red pepper was evaluated to substitute a basal nitrogen fertilizer because there was no difference in nitrate leaching and red pepper compared with the chemical fertilizer.
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