Estimated EC by the Total Amount of Equivalent Ion and Ion Balance Model
2012
Soh, J.W., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Lee, Y.B., University of Seoul, Seoul, Republic of Korea
To examine the EC model in a culture medium, basic culture medium of Rush (2005) and EC model of Robinson and Strokes (1959) were applied analyzing the equivalence ion total amount, the EC variable of cation and anion. Following the experiential translation by Steiner (1980), 130 optimized domestic and foreign culture media for crop growth were utilized, and estimated EC model was also demonstrated. Results from basic culture medium of Rush (2005) suggests an estimated EC by equivalence ion total amount and high reliable regressive model with 0.96 y = 1.33x - 0.23 of 0.96 as value R². It was found out that the change in concentration of positive ion and anion did not differ significantly with the increase and decrease of EC, however, there occurred a slight variable range. The change brings about a bigger anion influence than the previously reported positive ion, seemingly like those based on nitride ion and sulfur ion. The above EC estimated models confirmed that with optimized 130 domestic and foreign culture media for crop growth, the value derived will be as follows: R² = 0.98 with y = 1.23x - 0.02. In addition, the contour analysis of positive ion and anion for EC, with popularly known concentration range of EC 1.5 - 2.5 dSㆍm-¹ reveals an equivalent of more than 11 meqㆍL-¹ for positive ion and 15 meqㆍL-¹ for anion. On the other hand, the left bottom, low concentration 1.5 dSㆍm-¹ and the right above, high concentration 2.5 dSㆍm-¹, for both positive ion and anion existed differently in a proper culture medium concentration. This study adapted variables of both positive ion and anion of EC simultaneously, unlike in the previous culture medium by ion ratio in mutual ratio of Steiner (1980), and offers an EC model that can estimate levels or positive ion and anion in proper concentration, EC 1.5 - 2.5 dSㆍm-¹, with distributed features of ions.
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