This study was carried out to determine the effect of Kluyvera sp. CL-2 (KACC 91283P) on the growth of watermelon (Citrullus vulgaris L.). The study consisted of three treatments, no treatment (NT), twice application of Kluyvera sp. CL-2 before transplanting (KC1), and five times application around transplanting (KC2). We determined the chemical properties of soil before and after the treatments, and compared the growth characteristics of watermelon among treatments. The treatment of Kluyvera sp. CL-2 at 1.0×106 cfu mL-1 significantly increased available P2O5. The organic matter showed to increase for all treatments, while soil pH, exchangeable Ca and Mg tended to decrease for all treatments. The leaf width was increased by 11.6% for KC1 and 26.2% for KC2 compared to NT. But there were no significant differences in yield, leaf length, fruit weight, fruit length, fruit width, and pericarp thickness among treatments. The contents of free sugars such as fructose and glucose were increased by microbial treatments but sucrose was not different from NT. The content of glucose in watermelon was increased by 13.8% in KC1 and 12.8% in KC2 compared to NT. The content of fructose increased by 14.6% in KC1 and by 39.8% in KC2 compared to NT. The results from the study imply that Kluyvera sp. CL-2 can be used to increase sugar content in watermelon.

본 연구에서는 인산가용화 균주인 Kluyvera sp. CL2 처리시기가 과실품질에 미치는 영향을 구명하고자 본 연구를 실시하였다. 토양의 화학성 변화는 경핵기 처리구에서 인산이 가장 많이 증가하였고, K, Ca, Mg도 증가됨을 알 수 있었으며, pH의 변화는 토양 완충능에 의하여 적었다. 인산가용화균 처리에 따른 수용성 인산의 변화는 처리 시부터 20일 까지 효과적이었으며, 과립연화기 처리구부터 인산가용화율이 좋았다. 또한 과립연화기 처리구에서 과방중과 당도가 증가됨을 알 수 있었다. 인산가용화 균주 처리구에서 안토시아닌, 명도, 적색도, 황색도가 경핵기와 과립연화기 처리구에서 유의성을 보였으며, 특히 적색도가 향상되어 착색증진 효과가 있었다. 결론적으로 과실특성과 과실품질을 모두 비교하였을 때 과립연화기에 인산가용화 균주를 투입하는 것이 수량성과 품질면에서 가장 효과적이라고 생각된다.