Effects of Mixed Organic Fertilizer Application with Rice Cultivation on Yield and Nitrogen Use Efficiency in Paddy Field
2009
Cho, K.R., Gyeonggi-do Agricultural Research and Extension Services, Hwasung, Republic of Korea | Won, T.J., Gyeonggi-do Agricultural Research and Extension Services, Hwasung, Republic of Korea | Kang, C.S., Gyeonggi-do Agricultural Research and Extension Services, Hwasung, Republic of Korea | Lim, J.W., Gyeonggi-do Agricultural Research and Extension Services, Hwasung, Republic of Korea | Park, K.Y., Gyeonggi-do Agricultural Research and Extension Services, Hwasung, Republic of Korea
This study was carried out to investigate optimum application rate with mixed organic fertilizer for chemical fertilizer alternative where the paddy rice (Chucheong) was cultivated in clay loam of paddy field. The mixed organic fertilizer were applied at 0, 50, 100 and 150% levels of recommended nitrogen by soil testing plot compared with plot of chemical fertilizer (nitrogen, phosphate and potash), respectively. The ammonium nitrogen content in paddy soil and surface water of mixed organic fertilizer 100% plot were higher than chemical fertilizer plot. The absorbed amount of nitrogen and nitrogen use efficiency by rice plant in mixed organic fertilizer 100% plot were higher than chemical fertilizer plot. The number of tillers on rice at 30 days and 60 days after transplanting mixed organic fertilizer 100% plot were many more than chemical fertilizer plot. The milled rice yield of mixed organic fertilizer 100% plot was increased by 4 % than chemical fertilizer plot. The optimum application rate of mixed organic fertilizer was as follows; OAR∧MOF(Mg ha-¹) = (NAR∧ST ÷ NC∧MOF/1,000 × 0.93)/1,000〕 (OAR∧MOF : Optimum application rate of mixed organic fertilizer, NAR∧ST : Nitrogen application rate(kg ha-¹) by soil testing, NC∧MOF : Nitrogen content(g kg-¹) of mixed organic fertilizer, and 0.93 : 124.3 kg ha-¹/133.0 kg ha-¹, respectively).
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