ISHS Acta Horticulturae 697: International Symposium on Soilless Culture and Hydroponics
A NEW FUNCTIONAL FERTILIZER CONTAINING 5-AMINOLEVULINIC ACID PROMOTED HYDROPONICALLY-GROWN VEGETABLES IN THE NETHERLANDS |
| Authors: | K. Iwai, A. Saito, J. van Leeuwen, T. Tanaka, Y. Takeuchi |
| Keywords: | 5-ALA, citric acid, NO3, paprika, peat, rockwool, strawberry, sugar, yield |
| Abstract:
5-Aminolevulinic acid (5-ALA) is the key precursor in the biosynthesis of tetrapyrroles such as chlorophylls and hemes. 5-ALA is the unique precursor of tetrapyrroles. Iron element can activate 5-ALA-induced physiological actions. We conducted experiments of a new functional fertilizer including 5-ALA -HCl (0.3%), magnesium nitrate, Fe-DTPA, urea and the other mineral nutrients on the yield of paprika and strawberry fruits. Paprika and strawberry plants were transplanted in a rockwool and a peat respectively, and they were weekly irrigated with a hydoroponic solution added with or without the fertilizer (paprika: 500-800 and strawberry: 500 ml ha-1 ) respectively. The cumulative fruit yield of paprika treated with the fertilizer increased by 4.3 to 9.0% of control. The nutrient solution analysis showed that NO3-N uptake by paprika plants with the fertilizer treatment was increased by 16% of control. The yield increase of paprika may be related partly to NO3-N uptake increase by the fertilizer treatment. The cumulative fruit yield of strawberry during 8 weeks after the treatment increased by 4.8% of control. Size of the fruit slightly decreased, in contrast, percentage of dry matter, sugar and citric acid contents significantly increased. | |
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