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토양수분조절과 저단밀식재배가 토마토의 생육 및 수량에 미치는 영향
김기돈,윤화모,Kim, Gi-Don,Yoon, Wha-Mo 배재대학교 자연과학연구소 2004 自然科學論文集 Vol.14 No.2
본 연구는 토양수분조절과 저단밀식재배가 토마토의 생육, 수량 및 품질에 미치는 영향을 조사하고자 화방을 2단 및 3단으로 제한하는 동시에 재식밀도를 높게 하여 단위면적당 화방수를 증가시켜 토양수분 억제에 의한 수량 감소를 최소화하고자 수행하였다. 토양수분조절은 개화 40일 후에 관수개시점을 각각 -50kPa, -30kPa, -10kPa로 설정하였으며, 재식주수는 저단밀식재배를 목적으로 대조구에 비하여 2배를 정식하였다. 토양수분억제로 경경, 엽, 초장의 생장이 저하되었으며, 엽의 엽록소함량은 저단밀식재배의 -50kPa과 -30kPa처리에서 대조구에 비하여 높아지는 경향을 보였지만, 저단밀식재배의 -10kPa처리에서는 6단재배한 대조구의 엽록소함량에는 차이가 없었다. 과실의 배꼽썩음과와 열과는 토양수분이 억제될수록 발생율이 높았고 2단재배보다는 3단재배에서 발생율이 높았다. 토양수분의 억제는 과중의 감소를 초래하였고, 특히 저단밀식재배의 -50kPa처리에서 뚜렷한 감소를 보였다. 착과수는 토양수분조절에 따른 차이가 없었지만 제 1화방보다는 제 2화방과 3화방으로 올라갈수록 착과수가 감소하였다. 과실의 건물률은 토양수분이 억제된 -50kPa과 -30kPa처리구에서 대조구보다 높아지는 경향을 보였고, 2단재배보다는 3단재배에서 높아지는 경향을 보였다. 상품수량은 토양수분이 억제된 2단재배의 -50kPa과 -30kPa처리구에서 대조구에 비해 각각 46.3%, 36.7%가 감소하였고, 3단재배는 대조구에 비하여 각각 32.3%, 27.3% 감소하였다. This study aims at investigating the effect of soil moisture control and truss limited high density culture on the growth, fruit yield and quality of tomato. To minimize of loss yield of tomato, flower cluster in number was limited to two and three truss and planting density was raised. Soil moisture control was started from 40 days after anthesis and irrigation point was set in -30kPa and -50kPa, which were compared with -10kPa For high density culture, the planting number of truss limited high density culture was planted twice as many as control. Soil moisture repression reduced the growth of stem diameter, leaf and plant height. Leaf chlorophyll content was higher in -50kPa and -30kPa than control. No significant differences, however, shows in -10kPa. The occurrence rate of bloom-end rot and cracking was increased by growing of irrigation repression. Pinching three fruit truss was higher than pinching two fruit truss in the occurrence rate of them. Soil moisture repression resulted in the reduction of fruit weight and in special, truss limited high density was distinctly decreased in -50kPa. The number of fruit was not affected by soil moisture control, but 3rd flower cluster was lower than 2nd flower cluster in the number of fruits and 2nd one was lower than 1st one. Under irrigation repression, rate of dry matter tended to grow in -30kPa, -50kPa compared with control and pinching three fruit truss was higher than two truss. Marketable yield dropped to 36.7%m 46.3 in -30kPa, -50kPa on pinching two fruit truss and dropped to 27.3%, 32.3% in 3rd flower cluster compared with control.
김기돈,인수일 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
CO<sub>2</sub> emission is one of the biggest problem causing global warming. A variety of approaches for addressing CO<sub>2</sub> emission is currently under research. Photocatalyst is one of the effective strategies to solve this issue. TiO<sub>2</sub>-based materials are the most stable and preferred photocatalysts. But the UV light responsivity of TiO<sub>2</sub> owing to its large 3.2 eV bandgap and the fast recombination of photoexcited electrons and holes restrict the improvement of solar energy conversion efficiency. The band alignment between Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS) nanocrystal and TiO<sub>2</sub> favors charge separation across the interface. In this work, an attempt was done to fabricate hybrid photocatalyst based upon p-n heterojunction and applied for CO<sub>2</sub> photoreduction. CZTS, a well-known p-type semiconductor with a narrower direct band gap of 1.5 eV, was synthesized and coupled with n-type TiO<sub>2</sub>. The synthesis of hybrid photocatalyts was confirmed by numerous characterization techniques such as XRD, TEM, UV-Vis spectroscopy and production of methane.
Synthesis of Cu<sub>2</sub>ZnSnS<sub>4</sub> Nanocrystals by using method of hot injection
김기돈,인수일 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS) was studied as a material which can absorb visible light. CZTS is a p-type semiconductor with a band gap energy of 1.5 eV, which is suitable for solar energy conversion. This material consists of low toxic and abundant elements. It also is functions efficiently in the polycrystalline state. Recently in order to solve the CO<sub>2</sub> emission, CZTS was successfully achieved by using thin film of CZTS with a metalcomplex electrocatalyst. In this work, an attempt was done to synthesize CZTS by using hot injection, because the method is inexpensive. The synthesized CZTS was confirmed by numerous characterization techniques such as XRD, TEM, and UV Vis spectroscopy. The material also was measured for confirming production of methane using gas chromatography.