Humic-like substances extracted from different digestates: First trials of lettuce biostimulation in hydroponic culture

Guilayn, Felipe; Benbrahim, Mohammed; Rouez, Maxime; Crest, Marion; Patureau, Dominique; Jimenez, Julie

doi:10.1016/j.wasman.2020.01.025

Cited by 40 publications

(19 citation statements)

References 29 publications

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“…All this has indirectly increased tolerance/resistance against environmental stressors [1,2]. Some of these products, often defined as biostimulants, includes a wide range of organic substances able to increase biological processes at both the plant or rhizo-level [3,4]. Plant biostimulants are usually described as substances (e.g., humic substances, seaweed extracts, and protein hydrolysates) and/or micro-organisms (arbuscular mycorrhizal fungi and plant growth-promoting rhizobacteria) that, when applied to plants and/or to the rhizosphere, stimulate physiological and molecular mechanisms that boost quality attributes, root growth, nutrient uptake, tolerance to abiotic stresses, with positive effects on plant biomass, seed setting, flowers, and fruits production [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Humic-like substances (HLS) are among the most employed organic non-microbial plant biostimulants. HLSs can be extracted from natural fossil sources like peat and leonardite, and from decayed organic material like compost and digestate [4,[10][11][12]. HLSs are condensate organic compounds or macromolecules with a complex molecular structure and high soil/substrate tenacity [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Besides peat and/or leonardite extraction, HLSs may be obtained from organic residues like compost or digestate [14]. Digestates are the liquid/slurry by-product of the anaerobic digestion of organic matter and are rich in organic residues [4]. HLSs may be produced through aerobic composting of organic matter from bio-waste under thermophilic conditions.…”

Section: Introductionmentioning

confidence: 99%

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Biowaste-Derived Humic-like Substances Improve Growth and Quality of Orange Jasmine (Murraya paniculata L. Jacq.) Plants in Soilless Potted Culture

2021

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biowaste-Derived Humic-like Substances Improve Growth and Quality of Orange Jasmine (Murraya paniculata L. Jacq.) Plants in Soilless Potted Culture

2021

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“…These decisions are generally based on whether effects are caused by direct nutrient supply, or via some biostimulant effect that indirectly improves plant nutrient uptake, stress tolerance, or resistance to challenge by pests and pathogens [15]. Additionally, the impacts of plant growth promoters can be highly variable, and positive effects sometimes only transpire under narrow environmental conditions, or when plants are experiencing biotic or abiotic stresses [16][17][18][19][20][21][22]. Therefore, it is generally necessary to examine the responses of several plant species, under a range of growing conditions, in order to make meaningful generalizations concerning the effectiveness of new products [23,24].…”

Section: Introductionmentioning

confidence: 99%

Glasshouse Evaluation of the Black Soldier Fly Waste Product HexaFrass™ as an Organic Fertilizer

Borkent

Hodge

2021

Insects

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The mass farming of the black soldier fly (BSF; Hermetia illucens L.), to produce insect-based feed for livestock and fish, results in considerable amounts of insect frass, which contains substantial amounts of organic matter and bioavailable nutrients. Insect frass has shown good potential as a soil amendment and organic fertilizer. This study examined the effects of HexaFrass™ on the growth of common vegetables and herbs under glasshouse conditions. In an organically-rich potting mix, HexaFrass™ increased shoot dry weight by an average of 25%, although this effect was variable among test plants. In other trials, application of HexaFrass™ caused an increase in plant growth similar to that obtained by applying chicken manure and a commercial organic fertilizer. Increases in shoot and root dry weight showed quadratic relationships with HexaFrass™ dose, indicating that application of excessive quantities could lead to plant inhibition. Shoot:root dry matter ratio tended to increase with HexaFrass™ dose suggesting there was no specific stimulation or enhancement of root growth. Overall, these results provide further evidence of the potential of insect frass as an effective organic fertilizer for vegetables and herbs.

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“…Digestate is a kind of residue liquid of biogas produced by anaerobic fermentation with livestock and poultry manure as the main raw materials [ 5 ]. Valorization of livestock and poultry manure by anaerobic digestion has been considered as a standout option for bioenergy production in terms of energy efficiency and environmental impact [ 6 ]. Digestate can act as soil conditioner and provide valuable nutrients to plants [ 7 , 8 ], or digestate can be directly used as a nutrient source for soilless cultivation [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Digestate and Straw Combined Application on Maintaining Rice Production and Paddy Environment

Liu

et al. 2021

IJERPH

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Few studies have focused on the combined application of digestate and straw and its feasibility in rice production. Therefore, we conducted a two-year field experiment, including six treatments: without nutrients and straw (Control), digestate (D), digestate + fertilizer (DF), digestate + straw (DS), digestate + fertilizer + straw (DFS) and conventional fertilizer + straw (CS), to clarify the responses of rice growth and paddy soil nutrients to different straw and fertilizer combinations. Our results showed that digestate and straw combined application (i.e., treatment DFS) increased rice yield by 2.71 t ha−1 compared with the Control, and digestate combined with straw addition could distribute more nitrogen (N) to rice grains. Our results also showed that the straw decomposition rate at 0 cm depth under DS was 5% to 102% higher than that under CS. Activities of catalase, urease, sucrase and phosphatase at maturity under DS were all higher than that under both Control and CS. In addition, soil organic matter (SOM) and total nitrogen (TN) under DS and DFS were 20~26% and 11~12% higher than that under B and DF respectively, suggesting straw addition could benefit paddy soil quality. Moreover, coupling straw and digestate would contribute to decrease the N content in soil surface water. Overall, our results demonstrated that digestate and straw combined application could maintain rice production and have potential positive paddy environmental effects.

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Humic-like substances extracted from different digestates: First trials of lettuce biostimulation in hydroponic culture

Cited by 40 publications

References 29 publications

Biowaste-Derived Humic-like Substances Improve Growth and Quality of Orange Jasmine (Murraya paniculata L. Jacq.) Plants in Soilless Potted Culture

Biowaste-Derived Humic-like Substances Improve Growth and Quality of Orange Jasmine (Murraya paniculata L. Jacq.) Plants in Soilless Potted Culture

Glasshouse Evaluation of the Black Soldier Fly Waste Product HexaFrass™ as an Organic Fertilizer

Effect of Digestate and Straw Combined Application on Maintaining Rice Production and Paddy Environment

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