Composting of Vegetable Waste Using Microbial Consortium and Biocontrol Efficacy of Streptomyces Sp. Al-Dhabi 30 Isolated from the Saudi Arabian Environment for Sustainable Agriculture

Abstract

Thirty-seven root-associated Actinomycetes were isolated from the tomato plant for plant growth promoting activity. Among these, ten were selected for phosphate solubilisation, the production of siderophores, and indole acetic acid. Out of ten, eight Actinomycetes solubilised phosphate, whereas, Streptomyces sp. Al-Dhabi 30 showed better activity (43.1 mg/dL). Actinomycetes produced siderophore and the concentration ranged between 1.6 and 42.1 μg/mL. Streptomyces sp. Al-Dhabi 30 showed the ability to produce a maximum amount of indole acetic acid (IAA) (43 μg/mL), chitinase (43.1 U/mL), cellulase (67 U/mL), and protease (121 U/mL) than other strains. Further, vegetable waste was used as the bulk material for composting using Streptomyces sp. Al-Dhabi 30 along with microbial consortium. Total nitrogen content was 3.8% in Streptomyces sp. Al-Dhabi 30 inoculated compost, whereas 2.7% organic nitrogen was detected in the control. In the compost vegetable waste, the C:N ratio was 10.07, whereas it was 17.51 in the control. The vegetable waste composted with Streptomyces sp. Al-Dhabi 30, Lactobacillus plantarum ATCC 33222, and Candidautilis ATCC 9950 showed antagonistic activity and the supplemented compost enhanced shoot, root height, and total weightin tomato plants. These findings clearly suggest the use of Streptomyces sp. Al-Dhabi 30 as a potential biocontrol agent.

Heavy metals assessment in water, soil, vegetables and their associated health risks via consumption of vegetables, District Kasur, Pakistan

“…Heavy metal absorptions in vegetables and nutrition have contrary relationships that influence the various portions of vegetables (protein, fat, and carbohydrate) [11,12]. Many studies have been conducted on heavy metal pollution in developed countries' food chains [13][14][15][16]. However, some studies have been conducted in developing regions [17][18][19][20].…”

Co-Fermentation of Food Waste and Municipal Sludge from the Saudi Arabian Environment to Improve Lactic Acid Production by Lactobacillus rhamnosus AW3 Isolated from Date Processing Waste

“…Lactic acid has various uses in the beverage and food sector, in addition to the chemical and pharmaceutical industries, and its polymerization abilities are an advantage in the formulation of polymer poly(lactic acid) [15]. Solid-state fermentation has been performed using starter culture with the addition of enzymes [16], a single microorganism [17], or isolated indigenous bacterial/fungal strains [18].…”

Compost Inoculated with Fungi from a Mangrove Habitat Improved the Growth and Disease Defense of Vegetable Plants

“…Disease suppression might be improved by the inoculation of waste with microbes. The bacterium Streptomyces sp., when used in composting, was observed to suppress several pathogens [48]. Filamentous fungi (Trichoderma, Fusarium, Gliocladium, Aspergillus and Penicillium) have also been inoculated and suppressed pathogens successfully, as reviewed recently [35].…”