Effect of organic chemical fertilizers on growth, quality and phytochemical contents of kangkung (Ipomoea aquatica)
2007
Siti Hajar Ahmad, Universiti Putra Malaysia, 43400, Serdang, Selangor (Malaysia). Dept. of Crop Science | Rosenani Abu Bakar | Aswadi Abd Wahab, Universiti Putra Malaysia, 43400 Serdang, Selangor (Malaysia). Dept. of Land Management
A study was carried out to evaluate the effects of chemical and organic fertilizers on growth, phytochemical properties and quality characteristics of kangkung. A chemical fertilizer (NPK 15:15:15) was applied at the rate of 140 kg N/ha while two types of organic fertilizers (NPK 9:3:3 and NPK 5:5:5) were each applied at the rate of 280 kg N/ha. The experiment was carried out using the completely randomized design with 4 replications. Agronomic practices such as fertilizer application, weed control and irrigation were done accordingly. The growth characteristics such as plant height, leaf length, leaf number and yield were measured every seven days. After harvest, physical and chemical characteristics such as stem texture, moisture content, ascorbic acid content, soluble solids concentration, pH, titratable acidity and contents of carotenoid, polyphenol and chlorophyll were determined. The data were analyzed by analysis of variance and the treatment means were compared by LSD test. Plant height, leaf length and leaf number of plants treated with the chemical fertilizer were significantly greater than plants that were fertilized with the organic fertilizers. However, plants treated with organic fertilizers contained higher phytochemical contents such as ascorbic acid carotenoid and polyphenol compared to the plants treated with chemical fertilizers.
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