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Effect of EC Level of Nutrient Solution on the Yield and Quality of Cut Rose Based on Mixed Coir and Perlite  

Choi, Gyeong-Lee (Protected Horticulture Research Institution, NIHHS, RDA)
Cho, Myeong-Whan (Protected Horticulture Research Institution, NIHHS, RDA)
Seo, Tae-Cheol (Protected Horticulture Research Institution, NIHHS, RDA)
Roh, Mi-Young (Protected Horticulture Research Institution, NIHHS, RDA)
Rhee, Han-Cheol (Protected Horticulture Research Institution, NIHHS, RDA)
Publication Information
Journal of Bio-Environment Control / v.18, no.4, 2009 , pp. 348-353 More about this Journal
Abstract
Organic materials reveal the remarkable absorption and high buffer capacity for nutrient. Hence, organic materials need some different nutrient management skill from inorganic one. The objective of this study was to evaluate the effect of EC level of nutrient solution on the yield and quality of cut rose grown in the mixed substrate of coir and perlite. 3 EC levels of nutrient solution was treated, which were 0.7, 1.0, 1.3 times of standard solution (Aichiken solution, Japan) for cut rose hydroponics. EC of the standard solution was changed by season following as 1.4 (Apr.~June), 1.0 (July~Aug.), 1.4 (Sep.~Oct.), and $1.6dS{\cdot}m^{-1}$ (Nov.~Mar.) subsequently. The supply of nutrient solution was controlled by the signal of water potential at -5kPa using frequency domain reflectometry (FDR) sensor. As the results, marketable yield was similar for all treatments until 3rd harvest, but was decreased in high EC level from 4th harvest to 7th harvest as final. 0.7 times of standard solution decreased the ratio of unmarketable rose having short stem below 70cm and increased the ratio of high quality rose having long stem above 91cm. The flower weight and stem diameter of cut rose was higher in the low EC treatment than the others.
Keywords
cut rose; EC level; hydroponics; nutrient solution; organic material;
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