연구보문 : 벼 무논직파 재배시 완효성비료 적정시비량 = Research Papers : Proper Fertilization Rate of Slow-Releasing Fertilizer for Rice Cultivation in Direct Drill Seeding on Flooded Paddy Surface

국문 초록 (Abstract)

벼 무논직파재배시 시비노력 절감 및 쌀 품질을 향상시키기 위하여 2008년 및 2009년에 완효성비료 질소 시비량을 달리하여 검토한 결과를 요약하면 다음과 같다. 1. 쌀수량과 완전미 수량은 관행질소시비량(9 kg/10 a) 대비 80% 수준인 완효성비료를 10 a당 질소 7 kg을 시용하였을 때 비슷한 경향을 보였다. 2. 완효성비료를 10 a당 7 kg정도 시용하면 관행시비(9 kg/10 a) 보다 백미의 단백질함량이 낮아졌다. 3. 완전립 비율은 완효성비료를 10 a당 9 kg을 시용하였을때 유의성은 없으나 관행시비(9 kg/10 a)에 비해 약간 낮았으나, 7 kg/10 a을 시용하였을 때는 관행시비에 비해 높은 경향이었다. 따라서 남부지역에서 벼 무논직파 재배시 벼 생육, 완전미 수량 및 쌀 품질 등 을 고려해 볼 때 완효성비료의 적정 시비량은 10 a당 7 kg정도였다.

다국어 초록 (Multilingual Abstract)

This study was conducted to investigate the effectiveness and optimum rate of the slowreleasing fertilizer (SRF: N-P2O5-K2O = 18-12-13%) for drill seeding on flooded paddy surface by large scale direct drill seeding machine in Honam plain area in 2008 and 2009. To set the optimum rate of the SRF, three levels of nitrogen rate such as 5, 7, and 9kg/10a were compared with conventional compound fertilizer (N-P2O5-K2O = 9-4.5-5.7) application method as basal fertilization, top dressing at tillering stage, and at panicle initiation stage. Yield of milled-rice and head rice response to 7kg/10a rate of SRF were statistically insignificant to the results of conventional fertilization. These results indicate that the amount of nitrogen applied can be reduced by 20 % without reducing the grain yield and quality level. When using 7kg/10a of SRF, the protein content became lower and head rice ratio became higher than that of conventional nitrogen split application method. Considering rice growth, head rice yield and rice quality, the optimum amount of slow-releasing fertilizer was estimated 7kg/10a for direct drill seeding on flooded paddy surface in southern plain area.