Espresso coffee residues as a nitrogen amendment for small-scale vegetable production

Cruz, Soraia; Cordovil, C.

doi:10.1002/jsfa.7325

Cited by 18 publications

(7 citation statements)

References 19 publications

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“…It is thought that polyphenolic components such as chlorogenic acid (CGA) are phytotoxic through mechanisms including interference with plant metabolic pathways, membrane cell oxidation and immobilisation of soil N and P [34]. Caffeine may also present allelopathic activity through prevention of N mineralization [35]. Yet, SCG polyphenols are thought to enhance mineral uptake of crops through their binding capacity [36,37].…”

Section: Petri-dish Toxicology Testsmentioning

confidence: 99%

Soil Amendments and Biostimulants from the Hydrothermal Processing of Spent Coffee Grounds

Massaya

Mills-Lamptey

Chuck

2022

Waste Biomass Valor

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Purpose Use of spent coffee grounds (SCG) in horticulture has deleterious effects on plant health and yields, suggesting that processing of SCG is necessary prior to field application. To this end, two products of an SCG based biorefinery were investigated: primary chars from the hydrothermal carbonisation (HTC) of SCG and enzymatic protein hydrolysates. Methods Primary chars were produced under various HTC regimes from raw SCG, and alkaline pre-treated SCG. Primary chars were evaluated in germination toxicity tests and under soil stress conditions using Arabidopsis thaliana (Arabidopsis). Proteolytic enzymes were screened in production of SCG protein hydrolysates; biostimulant activity in the growth of Saccharomyces Cerevisiae, germination of Arabidopsis thaliana under normal and cold conditions and auxin-like activity was assessed. Results Toxicity assays of primary chars with land cress (Barbarea verna L.) showed a maximum 35% increase in root length, relative to the control. In Arabidopsis growth trials, outstanding performances were recorded at 100 t/ha for primary chars produced from alkaline pre-treated SCG: rosette diameter and dry weight increased by 531 and 976%, respectively, relative to the control. SCG protein hydrolysate from Bacillus lichenformis proteolysis (glycine present at 47% of total) gave 140% increase in Arabidopsis seeds with expanded cotyledons, relative to the control. Auxin-like activity was also measured in the extracts. Conclusion Cascade process design was used to valorise a major waste stream. Removal of phytotoxic components from SCG hydrochars enhanced plant growth, while biostimulant activity of SCG protein hydrolysates was observed. Graphical Abstract

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Section: Petri-dish Toxicology Testsmentioning

confidence: 99%

Soil Amendments and Biostimulants from the Hydrothermal Processing of Spent Coffee Grounds

Massaya

Mills-Lamptey

Chuck

2022

Waste Biomass Valor

View full text Add to dashboard Cite

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“…Caffeine is an alkaloid that has a toxic effect on a broad range of organisms at variable concentrations. Caffeine reduces N availability to plants and inhibits germination and plant growth [64]. Addition of SCG to soil has been found to reduce the growth of several crop species [53,64].…”

Section: Relationships Among Lettuce Growth Disease Incidence/severit...mentioning

confidence: 99%

“…Caffeine reduces N availability to plants and inhibits germination and plant growth [64]. Addition of SCG to soil has been found to reduce the growth of several crop species [53,64]. In order to avoid these drawbacks, SCG must be composted before their use in agriculture.…”

Section: Relationships Among Lettuce Growth Disease Incidence/severit...mentioning

confidence: 99%

Evaluation of the Potential of Agro-Industrial Waste-Based Composts to Control Botrytis Gray Mold and Soilborne Fungal Diseases in Lettuce

et al. 2021

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Composts are widely used in horticulture as organic amendments to improve the properties of soils. Composts have also been reported to enhance the disease suppressive potential of soils and, therefore, could be used as a strategy for managing plant diseases. The aim of this study was to test the ability of soils amended with four different agro-industrial waste-based composts (chestnut peels and shells, spent coffee grounds, grape marc, and olive leaves) to inhibit the growth and activity of Botrytis cinerea and several soilborne pathogens. First, the capacity of aqueous compost extracts to inhibit the growth of Botrytis cinerea and five soilborne fungi was evaluated in vitro using a broth macrodilution method. Second, lettuce plants were grown on soils amended with composts and inoculated either with B. cinerea or the soilborne fungus Fusarium oxysporum Schlechtendahl isolated from lamb’s lettuce. The determination of minimal inhibitory concentrations indicated that none of the composts inhibited the mycelium growth of the selected fungal pathogens. However, the pathogens did not cause any damage on plants grown on the chestnut- and olive-based composts. Lettuce yields were also highest for plants grown with composts made from chestnut and olive, irrespective of the amount of compost incorporated into soils (5% or 10%, weight basis). The grape-based compost also exhibited a fertilization effect, although the effect was associated with increased Fusarium wilt severity. Both N immobilization and symbiosis with the compost’s microflora were used to explain the pathogenicity of F. oxysporum Schlechtendahl in response to amendment with composts made from grape and coffee wastes. The beneficial effects of the chestnut- and olive-based composts reported in this study could be exploited in strategies aimed at reducing reliance on synthetic pesticides for the control of fungi in lettuce cultivation.

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“…Regarding the utilization of coffee by-products, current research mainly focuses on biochar production and composting coffee grounds. It has been shown that replacing chemical fertilizers with coffee grounds can increase soil respiration rate, soil organic carbon, total nitrogen, and trace element content [18][19][20], promote nutrient absorption by crops, and boost crop photosynthetic efficiency and yield [21]. Coffee husks, including pectin, are rich in organic and mineral nutrients.…”

Section: Introductionmentioning

confidence: 99%

Combined Application of Coffee Husk Compost and Inorganic Fertilizer to Improve the Soil Ecological Environment and Photosynthetic Characteristics of Arabica Coffee

et al. 2023

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Excessive use of chemical fertilizers deteriorates the soil environment and limits the normal growth of Arabica coffee trees. In order to identify the optimal coupling mode of chemical fertilizer application and biomass return that enhances the soil ecological environment and promotes the photosynthetic efficiency of Arabica coffee, this study investigated the impacts of three levels of inorganic fertilizers (FL: 360 kg·ha−1, FM: 720 kg·ha−1, and FH: 1080 kg·ha−1) and three types of coffee husk returning methods (CB: coffee husk biochar, CC: coffee husk compost, CA: coffee husk ash) on the soil fertility, microbial amount, enzyme activity, and photosynthetic characteristics of the Arabica coffee root zone. The entropy weight-TOPSIS method was employed to evaluate the comprehensive benefits. The results showed that FM had the biggest effect on improving soil fertility, microorganisms, and enzyme activities compared with FL and FH. Moreover, compared to CA, CC significantly increased soil organic carbon, organic matter, and total nitrogen content. CC significantly enhanced the activities of soil phosphatase and urease, respectively, by 29.84% and 96.00%, and significantly increased the amount of bacteria, fungi, and actinomycetes by 62.15%, 68.42%, and 46.21%, respectively. The net photosynthetic rate (Pn), transpiration rate (Tr), and stomatal conductance (Gs) of FMCC were significantly higher than those of other treatments. The comprehensive benefit evaluation of the soil environment and photosynthetic characteristics by the entropy weight-TOPSIS method ranked FMCC first. Therefore, FMCC was the optimal coupling mode for fertilizer application and the coffee husk returning method. The findings of this study not only provide scientific guidance for fertilizing Arabica coffee but also clarify the proper approach to returning coffee husk to the field, thereby improving soil ecology and promoting green and efficient production of specialty crops.

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Espresso coffee residues as a nitrogen amendment for small-scale vegetable production

Abstract: The study showed an inhibition of N and P mineralisation and a reduction of plant germination and growth. Further research is required to determine whether this is related to the immobilising capacity of the residue or possibly due to the presence of caffeine.

Cited by 18 publications

References 19 publications

Soil Amendments and Biostimulants from the Hydrothermal Processing of Spent Coffee Grounds

Soil Amendments and Biostimulants from the Hydrothermal Processing of Spent Coffee Grounds

Evaluation of the Potential of Agro-Industrial Waste-Based Composts to Control Botrytis Gray Mold and Soilborne Fungal Diseases in Lettuce

Combined Application of Coffee Husk Compost and Inorganic Fertilizer to Improve the Soil Ecological Environment and Photosynthetic Characteristics of Arabica Coffee

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