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Asian Journal of Plant Sciences

Year: 2005 | Volume: 4 | Issue: 4 | Page No.: 348-355
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Authors

Hyun Ju Kim

Young-Son Cho

Oh-Keun Kwon

Myung-Whan Cho

Jae-Bok Hwang

Soon-Do Bae

Weon-Tae Jeon

Keywords

High temperature and high light intensity in summer season tend to induce unbalance water uptake and mineral elements in hydroponic cultured roses. In addition, differential uptake of various elements causes unstable pH in root zone. To solve this problem the best managing range of nutrient, EC and pH, nutrient solutions were made of three levels of EC at 0.2, 0.7 and 1.2 dS m-1 and three pH levels, 4.0, 6.0 and 8.0, were adjusted. Stem length of rose was the greatest when a nutrient solution of pH 8.0 and EC 0.2 or 0.7 dS m-1 was supplied. The yield of cut-flowers was also the greatest when plants were fed with a solution of pH 8.0 regardless of EC. Maintaining of pH was possible in EC 0.7 dS m-1 at pinching time. The rhyzosphere pH was positively correlated with the EC in culture media even it was not changed in neutral pH range 6.0-7.0 in EC 0.2 dS m-1. Dry weight was mostly positively related with pH and dry weight of cut-flower and it was greatest at pH 8.0 in EC 1.2 dS m-1, however DWR, node numbers and leaf area were greater at pH 4.0 in EC 0.2. Stem Osmotic Potential (OP) was positively related with the culture media pH in EC 0.2 and 0.7 dS m-1. Leaf greenness was also positively related with the pH and EC. Cut-flower length and commercial cut-flower ratio, weight and leaf length were not significantly affected by EC but pH was more effective in low EC. Higher pH induced greater root growth. T-N was mostly greater at neutral cultural media in low or mid EC level but reversed effect was shown in high EC level (EC 1.2 dS m-1). The uptake pattern of Mg and Ca was same as higher at pH 6.0 in mid or low EC level and not affected by pH in low EC level. In conclusion, the best culture media of pH range is neutral with mid or low EC level which is economically valuable and practically viable.
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