Abstract
Waterleaf (Talinum triangulare (Jacq.) Willd has long been eaten in Indonesia as vegetable and the main parts consumed are leaves and young shoots. Waterleaf is sticky presumably due to its pectin content which is associated to dietary fiber. The dietary fiber which was analyzed in the present study was influenced by cultivation practices. The aim of this research was to study the effect of organic and conventional fertilization as well as the seasonal changes to the level of TDF (total dietary fiber), IDF (insoluble dietary fiber), SDF (soluble dietary fiber), and pectic substances in waterleaf. This research was conducted in four phases: sample cultivation, sample preparation, chemical analysis, and data analysis. This research used five samples cultivated with 5 different compositions of organic fertilizers and vice versa for conventional fertilizers. The cultivation was done in the experimental field of University Farm, Bogor, Indonesia during rainy season and dry season. Samples were harvested 8 weeks after planted, dried using drying oven for 17 hours at 60°C, ground and filtered to 40 mesh; and kept at -10°C until analysis. The overall result showed that the conventional samples contain higher dietary fiber than the organically fertilized samples, except the pectic substances of plant in dry season. Although its IDF content is higher than the SDF, the SDF content of waterleaf is relatively high compared to other vegetables, especially in dry season.
Highlights
Waterleaf (Talinum triangulare (Jacq.) Willd) has long been eaten in Indonesia as vegetable and the main parts consumed are leaves and young shoots
Similar trend was observed for IDF between rainy and dry season crops with range values of ~69 - 76 and 26 - 28 g/100g dw, respectively, this trend was reversed in SDF showing range values of ~4.6 - 5.8 and 13 - 17 g/100g dw, respectively
When comparing the average values of all conventional fertilized treatments we observe that values for TDF and IDF in rainy season crop > dry season crops (p < 0.05)
Summary
Waterleaf (Talinum triangulare (Jacq.) Willd) has long been eaten in Indonesia as vegetable and the main parts consumed are leaves and young shoots. It contains a sticky substance that is presumably due to its pectin content which is associated to dietary fiber. Waterleaf is an important source of phenolic antioxidants [1]. The dietary fiber which was analyzed in the present study as influenced by cultivation practices. Fertilization may be applied in organic and conventional practices which have been reported to influence a broad range of chemical constituents. Several studies have shown higher polyphenol content [2]-[5] and antioxidant activity [6] in organic plants compared to conventional grown plants. Nutrients in soil are reduced, the addition of fertilizer in the form of organic or conventional is important to maintain the soil fertility
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