Effect of the Organic Fertilizer Mixed with Various Recycled Coir Substrates on Chinese Cabbage(Brassica Campestris Ssp. Pekinensis) and Lettuce(Lactuca Sativa)

Abstract

The present study was conducted to find a way to recycle the coir substrate by investigating changes in its physical and chemical properties based on the number of use year. Specific gravity of unused coir substrate was 0.212 g/cm 3 , while it was higher for the substrate used for 2 years. Porosity was different depending on the number of use year. The porosity of unused substrate was 51.9%, but it increased to 68.6% after used for 2 years. In general, physical and chemical properties were better in the coir substrate used for 2 years than in unused one. The number of leaves, leaf area, flesh weight and dry weight of oriental cabbage and lettuce were higher in coir substrate used for 2 years than those in unused one. Whereas, no significant difference was observed between the substrates used for one year and 2 years, indicating that the one time-used wast substrate could be recycled for cultivating vegetables.Growth of the vegetables was improved when organic fertilizer composed of complex organics with different mixing ratios was provided to the coir substrate, compared to untreated plot. The optimum mixing ratio of the wast substrate and complex organics was 2:8(v/v) for fertilization using wast coir substrate. Therefore, coir substrate generally wasted after being used for one time was reuseable by supplying organic fertilizer.

Assessment of Different Aged Strawberry Growing Media Through Monitoring the Residual Nutrients Amount in Drainage of Hydroponic System

“…코코피트는 약산성 (pH 5.4 -6.6)으로 보수 및 투수성이 우수하며 딸기 생육시 배지전체에 뿌리가 고르게 분포하는 특성을 가지 고 있으며, 피트모스는 pH 3.5 -5.5로 수분 보유력 및 양이온 치환 능력 (CEC)이 150 -180 cmol kg (Lee et al, 2002). 또한 수경재배 배지 재사용에 대한 연구는 암면, 코이어배지에 대한 연구가 대부분이었다 (Jeong and Hwang 2001;An et al, 2003;Kim and Jeong 2003;Park et al, 2003;Lee et al, 2006;Ao et al, 2008;Lee et al, 2015). 따라서 본 실험에서는 딸기 고설수경재배 시 사용되는 피트모스 배지의 사용년수에 따른 급액과 배액 내 무기성분의 농도를 비교분석하여 배지의 재사용 가능 성에 대해 평가하고자 하였다.…”