Abstract
<p>Pak Choy or Bok Choy (<em>Brassica rapa </em>L. var. chinensis) is one of favorite Chinese leafy vegetable for various dishes in Indonesia. In this study, it was used as a plant model to identify the appropriate organic hydroponic nutrient solution for leafy vegetable seedling production. The seed was sown on rock wool slabs submerged with 200 ml of a nutrient solution containing biofertilizer of <em>Beyonic StarTmik@Lob</em> (0, 25, 50, 75, and 100%). commercial hydroponic solution (0, 25, 50, 75, and 100%) and its combination (25, 50, and 75%). The experiments were arranged in a CRD. Meanwhile, the obtained data was analyzed using ANOVA followed by DMRT. The relationship among growth parameters was observed using Pearson correlation analysis. The result of the study showed that the combination of organic and inorganic nutrient (25% <em>Beyonic StarTmik@Lob</em> and 75% commercial hydroponic solution) resulted in the highest seedling growth parameters and leaf indices as well as the perfectly positive correlations among growth parameters. This result indicated that the use of organic nutrient alone was not appropriate for hydroponic seedling production of Pak Choy. Therefore, further study needs to be done to identify the hydroponic solution without inorganic nutrients towards the organic vegetable production.</p>
Highlights
Pak Choy or Bok Choy (Brassica rapa) was introduced to South-East Asia in the 15th century
It was not significantly different with K0-1 when the seed was sown on the rock wool slabs containing the mixture of organic and inorganic solution (25% Beyonic StarTmik@Lob and 75% commercial hydroponic solution)
A study conducted by Chinta et al (2015) found that a biofilm was formed on the root surface of organic hydroponic lettuce; in contrast, chemical hydroponics resulted in a lack of biofilm
Summary
Pak Choy or Bok Choy (Brassica rapa) was introduced to South-East Asia in the 15th century Nowadays it is widely cultivated in this region including Indonesia. The national production of Brassica in 2015 is 600,200 tons (Central Agency on Statistics of Indonesia, 2015) This vegetable is commonly produced by conventional farming using inorganic fertilizer to enhance crop productivity. Botrytis) in lowland area showed a better vegetative growth but not for generative growth (Widiatningrum & Pukan, 2010) Organic farming of another Brassica species (cauliflower) was successfully done. We use both inorganic and organic nutrients using a hydroponic culture technique to identify the appropriate organic nutrient solution for Pak Choy seedling production prior a transplanting to the soil or soilless medium
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