A NEW FUNCTIONAL FERTILIZER CONTAINING 5-AMINOLEVULINIC ACID PROMOTED HYDROPONICALLY-GROWN VEGETABLES IN THE NETHERLANDS
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.
Iwai, K., Saito, A., van Leeuwen, J., Tanaka, T. and Takeuchi, Y. (2005). A NEW FUNCTIONAL FERTILIZER CONTAINING 5-AMINOLEVULINIC ACID PROMOTED HYDROPONICALLY-GROWN VEGETABLES IN THE NETHERLANDS. Acta Hortic. 697, 351-355
5-ALA, citric acid, NO3, paprika, peat, rockwool, strawberry, sugar, yield