Abstract
Humic-like substances (HLS) are among the most used biostimulants in agriculture as a means for improving plant growth, nutrient uptake, crop yield, and stress tolerance. HLS derived from municipal biowastes were applied as a substrate drench in order to evaluate their biostimulatory effect on the growth and ornamental quality of Orange Jasmine (Murraya paniculata L. Jacq.) potted plants. Two HLS, derived from the digestion of the organic humic fraction and from composting of a mix of sewage sludge digestate and gardening residues, were compared with a commercial leonardite-based product in the framework of a greenhouse experiment in soilless culture. The application of the two biowaste-derived HLS resulted in plants showing a 39.9%, 87.0%, 111.6%, 35.4%, 37.9%, 35.3%, and 81.3% increase in plant height, number of flowers and fruits, leaf production, total dry biomass, root length, and water use efficiency, respectively, compared to those treated with the commercial product and the untreated (control) plants. The enhanced growth performance of HLS-treated plants was due to the higher chlorophyll relative content (+24.2% on average) and net photosynthesis (+114.7% on average) of their leaves. The positive results obtained from the application of non-commercial HLS suggest that biowaste recycling is a sustainable and environment-friendly source of biostimulants, as an alternative to agrochemicals and existing leonardite-based plant biostimulants.
Highlights
Scientific and technical innovation has advanced many agricultural products, with improvements in plant growth, yield, and quality, as well as in the interaction between plant and soil/growing substrates
Humic-like substances (HLS)) and the two non-commercial biowaste-derived Digest and Comp HLS. Both noncommercial HLS were characterized by higher C and N content than those measured in Leonar HLS and, by a lower C/N ratio (6.9 on average), with respect to that calculated for Leonar HLS (135.4)
The biostimulant effects of two humic-like substances obtained from municipal biowastes on Orange Jasmine potted plants were compared with those provided by a commercial leonardite-based HLS
Summary
Scientific and technical innovation has advanced many agricultural products, with improvements in plant growth, yield, and quality, as well as in the interaction between plant and soil/growing substrates. All this has indirectly increased tolerance/resistance against environmental stressors [1,2]. Biostimulants are generally used for high-profit horticultural crops such as greenhousegrown vegetables and ornamental plants. These are often cultivated in soilless systems [1,7]
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