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소재우(Jae-Woo Soh),소순일(Soon-Yil Soh),남상용(Sang-Yong Nam) 한국원예학회 2015 원예과학기술지 Vol.33 No.6
본 시험은 배양액 내 pH 변화에 따른 이온과 EC의 모형을 구명하고자 수행하였다. 배양액 내 HPO₄<SUP>-2</SUP>와 H₂PO₄<SUP>-</SUP>의 변량에 따른 pH가 변하는데, pH 4.0-5.0은 EC의 변량이 상승하고, pH 5.0-7.0은 EC의 변량이 완만하고, pH 7.0-8.0은 다시 상승하였다. 배양액 내 다량원소의 변량을 보면, pH가 상승할수록 K, Ca, N, P의 이온 농도도 증가하는데, 특히 K과 P의 변량이 크게 나타났다. 반면 Mg와 S의 변량은 일정하게 유지되었다. 배양액의 IBM(ion balance model)에 따른 분석에서, EC의 변량은 크게 변하지 않고, 이온의 균형점이 a분면에서 d분면으로 이동하면 pH가 상승하면서 음이온보다 양이온이 증가하는 것으로 나타났다. 또한 pH 변량이 높을수록 EC 중앙선으로부터 멀어져 배양액의 이온 불균형이 증가되었다. HPO₄<SUP>-2</SUP>와 H₂PO₄<SUP>-</SUP>의 변량에 대한 K와 Ca의 당량비 보정은 pH가 증가할수록 K는 감소하지만 Ca는 증가하였고, EC 변량의 영향보다 큰 것으로 나타났다. K와 Ca의 당량비 보정에 따른 pH 변량은 0.97의 이차 다항식 상관모형을 나타냈다. 본 연구를 통해 인산염의 구배에 따른 pH, 이온, EC의 변량에 대하여 pH 변량 모형이 구명되었다. This experiment was performed to develop a model for nutrition ion concentration and EC in regard to change in pH from 4.0 to 8.0 in nutrient solution. The pH changes according to the variation of HPO₄<SUP>-2</SUP> and H₂PO₄<SUP>-</SUP> in the nutrient solution while variation of EC increased from pH 4.0 to 5.0, stabilized from pH 5.0 to 7.0 and increased again from pH 7.0 to 8.0. For the variance of major elements in the nutrient solution, K, Ca, N and P increased while pH was higher, especially the variables for K and P were increased largely. On the other hand, variables of Mg and S were stable. Based on analysis of the ion balance model of nutrient solution, the cation increased than anion over rising the variation of pH while balance point of ion moved from a-side to d-side. In addition, the imbalance increased while it moved away from the EC centerline as variance of pH increased. It was larger than effect of EC variance to correction values of equivalence ratios of K and Ca about variation of HPO₄<SUP>-2</SUP> and H₂PO₄<SUP>-</SUP> while as variance of pH increased, K decreased but Ca increased. These showed the result that variance of pH about correction values of equivalence ratios of K and Ca gave a second-degree polynomial model rating of 0.97. Through this research, it was identified the pH variable model about variance among pH, ion and EC according to gradient of phosphate.
소재우 ( Jae Woo Soh ),한경숙 ( Kyung Sook Han ),이성찬 ( Seong Chan Lee ),박종한 ( Jong Han Park ) 한국국제농업개발학회 2014 韓國國際農業開發學會誌 Vol.26 No.2
This research was performed to establish basic technology of chemical control and the degree of contamination of P. brassicae by researching the soil contamination of the regions well known as the major producer of summer Chinese cabbage. As places well known for summer Chinese cabbage, 12 out of 15 in Pyeongchang-gun. Seven out of 11 regions in Samcheok-si and Taebaek-si resulted positive for P. brassicae contamination. It was found out that the soil contamination rate of P. brassicae was 80 % in Pyeongchang-gun, 63.6 % in Samcheok-si and Taebaek-si. The 10 places where the Chinese cabbage clubroot was verifiable by naked eye were 100 % confirmed by the PCR test of the P. brassicae soil contamination. Thus, the P. brassicae soil contamination could be diagnosed by the simple PCR test and it could be utilized as an index for deciding chemical control.