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코코피트 구성물질 변화에 따른 코코피트의 물리적 구조와 화학적 특성 변화
이교석(Kyo-Suk Lee),이동성(Dong-Sung Lee),서길용(Gil-Yong Suh),노소정(So-Jung Noh),민세원(Se-Won Min),정덕영(Doug-Young Chung) 한국펄프·종이공학회 2018 펄프.종이기술 Vol.50 No.1
To verify the effective usage period of cocopeat as a growth media for plants growing in a greenhouse, we conducted this investigation by observing the changes of physical and chemical properties of cocopeat used as the bag culture substrate of greenhouse tomatoes for three years. The results showed that the organic matter contents and the EC were increased from 82.0 to 96.2% and from 53.5 to 22.2 dS m<SUP>-1</SUP>, respectively. Also, cation exchange capacity was significantly increased from 71.0 to 191.7 cmol kg-<SUP>1</SUP>, indicating the surface charges were developed by the breakdown of the cocopeat. The surface structure observed with electrical microscope showed that the number of large pores decreased with increasing cultivating time with increasing the proportion of smaller pores within the cocopeat body, indicating that the decomposition of substances inside the cocopeat structures. Also we found that the content of cellulose was rapidly decreased with increasing usage period contrary to the increase in CEC. With these results, we could conclude that these changes of all physical and chemical properties of the cocopeat might strongly influence CEC due to decomposition of lignin within the cocopeat and increasing periods of usage as the substrate of growth media for tomato.
이동성(Dong-Sung Lee),이교석(Kyo-suk Lee),신지수(Ji-Soo Shin),이재봉(Jae-Bong Lee),주리나(Ri-Na Joo),이명연(Myong-Youn Lee),민세원(Se-Won Min),정덕영(Doug-Young Chung) 충남대학교 농업과학연구소 2015 농업과학연구 Vol.42 No.3
We conducted this research to observe the changes of surface morphology and composition of clay minerals influenced by various concentrations of fluoric acid. Hydrofluoric acid (HA), a solution of hydrogen fluoride (HF) in water, is a colourless solution that is highly corrosive, capable of dissolving many materials, especially oxides. To do this, we treated several concentrations of HA on the ground soil samples collected from the agricultural experimental station located at Chungnam National University to observe the influence of fluoric acid on the changes of surface structures and elemental composition of clay particles. Generally, microscopic examination showed that the HA can not only attack an edge of clay particles but also start at any point where structural defects and weaknesses predisposed sites to acid. The orderly flake arrangement of clay minerals may reflect certain crystal symmetry elements. The ESEM-EDS results of element composition of clay particles influenced by HA indicated the changes of structures of clay minerals. It is also clear from the formation of etch figures and element composition of clay particles that the product layer at least partially dissolved or disintegrated in the presence of acid. Conclusively, the clay structures can be strongly influenced by concentrations of HA, resulting in changes of physical and chemical properties that can determine the behavior of solute transport as well as mobility of ions in soils.