Abstract
This research was undertaken to evaluate the influence of zeolite and synthetic aggregates (SRA) produced with acidic red soil and paper waste, on the growth of French marigold (Tagetes patula), which is a popular ornamental plant in Japan. Five different media were studied: SRA only, SRA:Zeolite 3:1, SRA:zeolite 1:1, SRA: zeolite 1:3 and zeolite only. Mixing SRA with zeolite improved the physical and chemical properties of the media such as particle size distribution, bulk density, total porosity, water holding capacity, and pH compared to zeolite. SRA and zeolite at 1:1 gave the best maximum growth parameters of French marigold. Zeolite based mixtures increased the nitrogen (N), potassium (K), magnesium (Mg), and calcium (Ca) concentrations in plant tissues compared to SRA medium. Addition of zeolite led to reduce K leaching from the substrate compared to SRA. SRA and Zeolite at 1:1 can be recommended as a better substrate for French marigold cultivation.
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