Organic Resources Research Articles

Close‐packed One‐dimensional Coordination Polymer Cathode with Fast Kinetics for Sodium‐ion Batteries

Sustainable sodium‐ion batteries (SIBs) have gained tremendous attention; however, the large‐sized Na+ poses serious challenges on the development of inorganic‐based cathodes. To overcome the issues, metal–organic electrode materials are appealing because they combine attractive characteristics of organic redox centers (e.g., flexibility, highly reversible redox properties, fast kinetics (regardless of size and charge of guest ions), structural/redox tunability, and resource abundance) with structural stability arising from metal‐ligand coordination. Herein, a one‐dimensional copper‒benzoquinoid coordination polymer (CP), [CuL(Py)2]n, (LH4 = 1,4‐dicyano‐2,3,5,6‐tetrahydroxybenzene, Py = pyridine) is investigated as cathode for SIBs. As opposed to most CPs reported for SIBs which possess high porosity and surface area, this close‐packed CP can deliver discharge capacity as high as 277 mAh g‒1 at 2C (~523 mA g‒1), and at extremely high rates of 50C and 300C (~13 and 78 A g‒1), reversible capacities of 131 and 74 mAh g‒1 still can be delivered, respectively. The transport kinetics of Na+ in [CuL(Py)2]n is found to be even faster than that of Li+ despite the close‐packed structure. The mechanistic and kinetic studies have been performed. The findings gained in this work undoubtedly unravel a potential design strategy for high‐performance metal–organic electrode materials for emerging post‐Li‐ion batteries.

A Comprehensive Overview on Sustainable Vegetable Gardening: Eco-friendly Approaches to Home Grown Production

Sustainable vegetable gardening is an eco-friendly practice that integrates organic farming principles, resource conservation, and biodiversity promotion to produce nutritious, chemical-free food while minimizing environmental impact. This approach emphasizes soil health through the use of organic amendments, crop rotation, composting, and mulching to improve fertility and water retention. Water conservation techniques, such as drip irrigation and rainwater harvesting, are employed to optimize water use, especially in arid regions. Pest and disease management relies on integrated pest management (IPM), biological controls, companion planting, and the use of organic pesticides to reduce chemical input while maintaining crop health. Sustainable homegrown produce has been shown to have superior nutritional content compared to commercially grown produce, and the avoidance of synthetic chemicals reduces the risk of pesticide residue exposure. Gardening fosters healthy eating habits by connecting individuals to their food sources, encouraging the consumption of fresh, unprocessed vegetables, and contributing to food security. The mental and physical health benefits of gardening, including reduced stress, increased physical activity, and improved mental well-being, further highlight its holistic value. However, challenges such as the initial setup costs, time investment, pest management, and knowledge gaps can hinder widespread adoption. Addressing these challenges requires greater access to resources, educational initiatives, and the development of climate-resilient practices tailored to specific regions. Future trends in sustainable gardening include the adoption of technological innovations, such as smart irrigation systems, automation, and vertical farming, which offer scalable solutions for urban and small-scale gardeners. The COVID-19 pandemic has underscored the importance of resilient, local food systems, and sustainable gardening is poised to play a critical role in addressing future food security concerns.

Effect of time series on the degradation of lignin by Trametes gibbosa: Products and pathways

Lignin is the third most abundant organic resource in nature. The utilization of white-rot fungi for wood degradation effectively circumvents environmental pollution associated with chemical treatments, facilitating the benign decomposition of lignin. Trametes gibbosa is a typical white-rot fungus with rapid growth and strong wood decomposition ability. The lignin content decreased from 23.62 mg/mL to 17.05 mg/mL, which decreased by 27 % in 30 days. The activity of manganese peroxidase increased steadily by 9.44 times. The activities of laccase and lignin peroxidase had the same trend of change and reached peaks of 49.88 U/L and 10.43 U/L on the 25th day, respectively. The change in H2O2 content in vivo was opposite to its trend. For FTIR and GC–MS analysis, the fungi attacked the side chain structure of lignin phenyl propane polymer and benzene ring to crack into low molecular weight aromatic compounds. The side chains of low molecular weight aromatic compounds are oxidized, and long-chain carboxylic acids are formed. Additionally, the absorption peak in the vibration region of the benzene ring skeleton became complex, and the structure of the benzene rings changed. In the beginning, fungal growth was inhibited. Fungal autophagy was aggravated. The metal cation binding proteins of fungi were active, and the genes related to detoxification metabolism were upregulated. The newly produced compounds are related to xenobiotic metabolism. The degradation peak focused on the redox process, and the biological function was enriched in the regulation of macromolecular metabolism, lignin metabolism, and oxidoreductase activity acting on diphenols and related substances as donors. Notably, genes encoding key degradation enzymes, including lcc3, lcc4, phenol-2-monooxygenase, 3-hydroxybenzoate-6-hydroxylase, oxalate decarboxylase, and acetyl-CoA oxidase were significantly upregulated. On the 30th day, the N-glycan biosynthesis pathway was significantly enriched in glycan biosynthesis and metabolism. Weighted correlation network analysis was performed. A total of 1452 genes were clustered in the coral1 module, which were most related to lignin degradation. The genes were significantly enriched in oxidoreductase activity, peptidase activity, cell response to stimulation, signal transduction, lignin metabolism, and phenylpropane metabolism, while the rest were concentrated in glucose metabolism. In this study, the lignin degradation process and products were revealed by T. gibbosa. The molecular mechanism of lignin degradation in different stages was explored. The selection of an efficient utilization time of lignin will help to increase the degradation rate of lignin. This study provides a theoretical basis for the biofuel and biochemical production of lignin. SynopsisTrametes gibbosa degrades lignin in a pollution-free way, improving the utilization of carbon resources in an environmentally friendly spontaneous cycle. The products are the new way towards sustainable development and low-carbon technology.

Strong large‐scale structure–function coupling in benthic bacteria is mediated by algae in a geodiverse river network

AbstractBenthic bacteria in stream ecosystems drive organic matter mineralization. However, knowledge on how this ecosystem function is driven by bacterial community composition in interaction with environmental conditions and organic matter resources is poor. This is especially true when considering the regional scale of river networks, at which environmental conditions vary in a scale‐dependent manner and are spatially structured due to asymmetrical water flow. Similarly, organic matter resources may have a terrestrial origin in remote headwaters or be sourced locally from algae living in close proximity to bacteria in benthic biofilms. We investigated benthic biofilm meta‐community structure and function across the > 6700 km2 river network of the near‐natural Vjosa in Albania and Greece and found a strong control of the benthic algal community on bacterial community composition (13.4% of variability explained). In addition, bacterial community composition has linkages to water chemistry, which itself is strongly shaped by the diverse geology in the catchment, and to dispersal, shaping metacommunity structure as a neutral process. Notably, bacterial community composition explained the largest single fraction of variability (31.5%) in extracellular enzymatic activities, while there was no dependency of enzyme ratios on organic matter nor environmental conditions. Synergistic effects between bacteria and algae accounted for additional 47.3% of variability in heterotrophic functioning, emphasizing the importance of algal–bacterial interactions in benthic biofilms. Our findings shed new light on bacterial structure–function coupling highlighting the importance of algal–bacterial interactions at the river network scale.

High-efficient synthesis of straw-derived carbon quantum dots for facilitating methanogenic performance in high-load co-digestion of food waste and excess sludge

Anaerobic digestion (AD), as a crucial technology for organic waste resource recovery, faces the challenge of low efficiency in converting high-load organic substance into biogas. In this study, high-load AD system with food waste and excess sludge as co-substrates was constructed. The effect and mechanism of carbon quantum dots (CQD) derived from straw in promoting the performance of AD systems have been studied. The oxidation pretreatment of straw with H2O2 and acetic acid increased the yield of hydrothermal synthesis CQD to approximately 40%. The effect of different CQD on CH4 yield performance was further explored. The cumulative CH4 yield performance of the fermenter was improved after adding CQD. The CQD synthesized from pretreated straw and the nitrogen-doped CQD synthesized using Chlorella as the nitrogen source showed competitive promotion performance, increasing cumulative CH4 yield by 17.71% and 8.87%, respectively. These CQD can effectively accelerate the degradation of dissolved organic matter and thus improve the CH4 yield performance, with the most significant effect of CQD synthesized from pretreated straw. Electrochemical analysis and the correlation analysis between microorganisms and performance parameters showed that these CQD established an electron conductive network to enhance the electron transfer of the system. This well conductive conditions enriched hydrogenotrophic methanogenic (Methanosarcina), electroactive bacteria (Clostridium_sensu_stricto_1), and hydrolytic-acidifying bacteria (norank_f__Bacteroidetes_vadinHA17). This study significantly enhanced the yield of straw-derived CQD through green methods, and deeply revealed the potential promoting mechanisms of biomass-derived CQD by investigating the correlation between system performance and microorganisms in high-load AD systems

Effects of Mela Organics' New Liquid Fertilizer on Tomato Yield in Semi-Arid Areas of Ethiopia

Soil organic matter depletion is mainly caused by crop residue removal, and low or no application of organic fertilizers often results in nutrient exhaustion and low crop yields. This challenge requires the evaluation of different organic fertilizer resources to provide new alternative fertilizer products to an Ethiopian production system. Based on this fact, an experiment was conducted to evaluate the effects of mela organic fertilizer as a supplementary fertilizer to improve the yield of tomatoes under irrigation in the Central Rift Valley of Ethiopia from 2020 to 2021. The experiment consisted of eight treatments (Control, 100% recommended fertilizer, 100% recommended fertilizer + 30 L/ha Mela, 100% recommended fertilizer + 45 L/ha Mela, 75% recommended fertilizer +30 L/ha Mela, 75% recommended fertilizer + 45 L/ha Mela, 50% recommended fertilizer +30 L/ha Mela and 50% recommended fertilizer + 45 L/ha Mela) laid out in randomized complete block design with three replications. The results revealed that the highest agronomic yield was obtained by applying the 100% recommended fertilizer + 30 L/ha Mela. However, based on the partial budget analysis, the highest marginal rate of return was obtained from 50% recommended fertilizer + 45 L/ha Mela. Thus, it can be concluded that the application of Mela Organics up to 45 L/ha, integrated with chemical fertilizer applications, can increase tomatoes' economic yields and reduce fertilizer costs.

Evaluation and Ranking of Energy Alternatives for Implementation in Different Geographic Scenarios using Decision Methods: Case Study of Colombia

In this research, several crucial aspects have been explored in the evaluation and ranking of energy alternatives in Colombia using advanced decision methods such as TOPSIS and Diffuse TOPSIS. The study analyzed how these techniques allow to effectively compare different renewable energy sources in various regions of the country, highlighting the importance of considering multiple approaches due to the unique geographical and energy characteristics of each region. Specifically, five regions were evaluated: Caribbean 1 and 2, Pacific 1 and 2, Andean, Amazonian and Orinoquia, observing significant differences in the evaluation of technologies between the models. In the evaluation of energy sources for each region, the potential of photovoltaic solar energy in the Caribbean and Orinoquia regions was emphasized due to the high solar radiation, wind energy in the Caribbean and Pacific regions due to its strong winds, and biomass in the Amazon and Andean regions thanks to the abundance of organic resources. These technologies not only contribute to the reduction of carbon emissions and the diversification of the energy matrix, but also promote a just energy transition by generating employment and improving the quality of life in local communities. The TOPSIS method and its diffuse variant make it possible to weigh criteria with different degrees of importance and manage uncertainty in decision-making, resulting in more precise evaluations adapted to specific contexts. This type of research is vital for decision-making in the Colombian electricity sector, as it provides a solid and replicable methodology for evaluating energy alternatives in an integral way. The results not only contribute to environmental sustainability, but also boost the socio-economic development of the regions, fostering an equitable and fair energy transition.

Characteristics of rain tree seed (Samanea saman) biochar at different pyrolysis temperatures

Abstract A Rain trees (Samanea saman) yield abundant seeds, averaging 200-250 kg of pods per season from mature trees. This high seed production often results in waste or undesired seedlings. To mitigate this issue, researchers are studying methods to utilize these seeds effectively. One promising approach involves converting rain tree seeds into biochar through pyrolysis, a process that transforms organic resources into valuable products. However, the characteristics of the biochar depend on the pyrolysis temperature. This study aims to examine how different temperatures affect the properties of rain tree seed biochar. The seeds were subjected to pyrolysis at temperatures of 300°C, 400°C, 500°C, and 600°C for four hours. The results show that increasing the pyrolysis temperature will decrease the biochar yield, with the highest yield at 300°C being 50.52%. Conversely, the ash content and fixed carbon increase with rising temperatures. SEM analysis indicates that pores begin to form at 400°C; however, at 600°C, extensive pore cracking is observed. Based on FTIR analysis, functional groups including -OH, C=C, C=O, C-O, and C-H were identified. XRF analysis reveals that the four dominant elements in biochar are K2O (55-59%), CaO (24-28%), P2O5 (11-12%), and MgO (1.5-1.9%). Based on these dominant elements, rain tree seed biochar has potential for soil amendment, containing macronutrients necessary for plant growth.

Response of Soil, Growth, and Biomass Properties of Lupin (Lupinus albus L.) to Wood ash and Sawdust

Two organic carbon resources (wood ash and sawdust) were applied in the study site to assess their profound effects on soil properties and growth and biomass properties of lupin (Lupinus albus L.). Because of their contribution to improving soil structure, enhanced water-holding capacity, and increased carbon sequestration. The experiments were conducted in mid-November 2022 at Grdarasha Research Station, College of Agricultural Engineering Sciences, Salahaddin University-Erbil, Iraq. The experiment includes two organic amendments (wood ash and sawdust) as a treatment and Control. Results showed that the application of wood ash and sawdust improved and raised the number of essential elements and heavy metals in the soil, which in turn boosted the ability of the roots to absorb nutrients. The highest germination percentage, plant height, and leaf number were observed in the ash treatment (95.00 %, 22.00 cm, and 21.22) respectively. The great values of fresh and dry shoot weight were found in sawdust treatment 63.78 and 14 g/plant) respectively. The effects of treatments were not significant on root length and fresh and dry root weights. The final findings showed that adding various forms of organic carbon could alter the chemical characteristics of the soil. This, in turn, might have a good impact on microbes, which can subsequently help plants grow by converting, solubilizing, and mobilizing soil nutrients. Furthermore, lupin plants appeared to be a form of phytoremediation, or absorption, for certain heavy metals.

Differences in humic acid structure extracted from different types of peat

ABSTRACT Peat is an organic mineral resource. Peat contains a large amount of humic acid, and extracting humic acid from peat is a way to efficiently utilize peat. This article mainly studies the effects of using woody, herbaceous, and mossy peat as raw materials on the yield, content, and especially molecular structure of humic acid extraction, including that the oxygen-containing functional groups of humic acids, aromatic carbon content, microcrystalline structure, carbon chain structure, and degree of aromatization. The results showed that the highest yield of humic acid in woody peat was 54.33%, the yield of humic acid in herbaceous peat and mossy peat are relatively low, at 44.67% and 15.00%, respectively. while the woody peat humic acid has the lowest content, that is 38.38%. The content of humic acid in herbaceous peat was 77.33%. and the content of humic acid in mossy peat is 57.85%. Through comprehensive consider, herbaceous peat is more suitable for extracting humic acid. At the same time, this article studies the molecular structures of three peat humic acids and concludes as follows. Woody peat humic acid has the highest degree of aromatization, the highest content of benzene ring, and more functional groups such as methyl, phenol, aromatic ether, carbonyl, and hydroxyl groups. The content of methoxy and methylene groups in herbaceous peat humic acid is relatively high. Through XPS characterization analysis, it was found that the main forms of oxygen element in humic acid are C = O, C-O, and -COOH, without inorganic oxygen. The humic acid extracted from different types of peat has significant differences in yield, purity, and functional group content. Compared to woody peat and mossy peat, herbaceous peat is the most suitable raw material for extracting humic acid from peat.

Rapid Reduction of Phytotoxicity in Green Waste for Use as Peat Substitute: Optimization of Ammonium Incubation Process.

The rapid growth of the horticultural industry has increased demand for soilless cultivation substrates. Peat, valued for its physical and chemical properties, is widely used in soilless cultivation. However, peat is non-renewable, and over-extraction poses serious ecological risks. Therefore, sustainable alternatives are urgently needed. Ammonium incubation, a novel method to reduce phytotoxicity, offers the potential for green waste, a significant organic solid waste resource, to substitute peat. This study optimized the ammonium incubation process to reduce green waste phytotoxicity. It systematically examined different nitrogen salts (type and amount) and environmental conditions (temperature, aeration, duration) affecting detoxification efficiency. Results show a significant reduction in phytotoxicity with ammonium bicarbonate, carbonate, and sulfate, especially carbonate, at 1.5%. Optimal conditions were 30 °C for 5 days with regular aeration. Under these conditions, ammonium salt-treated green waste significantly reduced total phenolic content and stabilized germination index (GI) at a non-phytotoxic level (127%). Using treated green waste as a partial peat substitute in lettuce cultivation showed promising results. This low-cost, low-energy method effectively converts green waste into sustainable peat alternatives, promoting eco-friendly horticulture and environmental conservation.

Combining Farmyard Manure with Mineral Nitrogen Fertilizer Boosts Maize Yields and Maintains Soil Health: Insights from Four Long-Term Experiments

Maize productivity in sub-Saharan Africa often falls below its potential due to soil fertility challenges. Researchers assessed the potential to counteract soil organic carbon (SOC) losses and yield declines using different organic resource treatments, with and without mineral nitrogen (N) fertilizer. While all treatments that received mineral N had similar yields in the first year, the application of farmyard manure (FYM) combined with mineral N was the only treatment that did not lose yields over the two decades, eventually outperforming all others. The results suggest that combining FYM with mineral N is the most effective of all tested strategies for simultaneously sustaining maize yields and SOC levels in similar tropical soils.

NH4Cl recovery from high-ammonia organic waste liquor by electrolysis with aluminum soluble anode

High-ammonia organic waste liquor is regarded as highly toxic and non-biodegradable due to containing high concentration of ammonia and organic refractory compounds. Treating high-ammonia organic waste liquor could be costly in the need of large energy or chemical agent input. Recovery of ammonium is an alternative way because high ammonium waste liquor could act as a reservoir of nitrogenous fertilizer. In this study, NH4Cl was separated from waste liquor by electrolysis with aluminum-soluble anode. The white foamy substances with NH4Cl purity over 90 % were produced at a current density of 12.5 mA/cm2 with 100 min electrocution. The white foamy substance production rate was increased as pH rose, and NH4Cl purity increased from 82.44 % at pH 4 to 91.34 % at pH 6. The soluble aluminum from anode sacrifice promoted crystallization and separation of NH4Cl by participating in the formation of CGAs (Colloidal Gas Aphrons) and improving their stability. Organic substances in the liquor functioned as surfactant to generate of CGAs, CGAs carried NH4Cl crystals floated to the surface and formed the white foamy substance. The study proposes an efficient, sustainable method for the hazardous high-ammonia organic waste liquor resource utilization.

Assessing the impact of organic resources and phosphorus on nutrient uptake, soil traits and seed potato productivity

AbstractImproving tuber yield size to boost seed potato (Solanum tuberosum) production efficiency is a paramount goal, particularly in Punjab, India, a major contributor to the nation's seed supply. To optimize nutrient absorption, soil quality, and yield of seed‐sized tubers, research was conducted in Ludhiana and Jalandhar over two years. Employing a split‐plot design, three organic treatments (farmyard manure [FYM], biofertilizer, control) were tested in main plots, while five phosphorus fertilizer levels (46.9, 62.5, 93.8, 125, 0 kg ha−1 P2O5) were examined in subplots. Results revealed that FYM notably enhanced nitrogen, phosphorus, and potassium uptake in both haulm and tubers compared to other organics. Moreover, higher phosphorus levels, particularly 125 kg ha−1 P2O5, maximized nutrient uptake. Soil attributes like available nitrogen remained unaffected, whereas phosphorus availability increased with FYM and higher phosphorus levels. Available potassium remained consistent across treatments. Soil pH, electrical conductivity, and organic carbon were unchanged with 125 kg ha−1 P2O5 treatments. FYM and biofertilizer significantly increased total tuber yields, with FYM showing a remarkable 30% boost compared to the control, and 125 kg ha−1 P2O5 phosphorus levels resulting in a notable 24% increase, indicating enhanced seed potato production strategies. Principal component analysis underscored the positive correlation between tuber yield and soil attributes, particularly favoring FYM and 125 kg ha−1 P2O5 treatments. Overall, FYM application and optimal phosphorus fertilizer levels are pivotal for augmenting nutrient uptake, soil health, and yield in seed potato cultivation.

Performance of the Petroleum Reservoir Under Waterflooding at the Petrochad Field in Mangara-Chad

The Mangara petroleum field is made up of three superimposed reservoirs (C, D, E) with approximately 2500 m depth. These are unconsolidated sandstone reservoirs with an underlying active aquifer. The petrophysical properties of the reservoirs are relatively good as it’s a self-sourced unconventional reservoir based on its organic richness characteristics unconventional resource opportunity as tight carbonate reservoir. Tank pressure is approximately 2900 psi, for an average temperature of 180°F. Of the 50 wells initially drilled, 23 are currently producing. The pressure is support by 04 injector wells, and daily production is estimated at approximately 12,000 bbl/d. To maximize oil production and minimize water production, the positions of injection wells were moved, which permitted to reduce the number of producing wells from 23 to 18. The result revealed that this scheme can maintained the pressure at desired levels of 2900 psi, until year 2040 and reversed the current trend in water production, which was 14,000 bbl/d. In the predicted scenarios, cumulative production will be maintain at 25,000 bbl/d with a daily production of around 18,000bbl of oil compared to formerly figure of 7000 bbl of water until 2040.

Crude Oil Extraction Technology from Organic Waste Resources: A Review

Crude Oil Extraction Technology from Organic Waste Resources: A Review

Microwave-Assisted Pyrolysis-A New Way for the Sustainable Recycling and Upgrading of Plastic and Biomass: A Review.

The efficient utilization of organic solid waste resources can help reducing the consumption of conventional fossil fuels, mitigating environmental pollution, and achieving green sustainable development. Due to its dual nature of being both a resource and a source of pollution, it is crucial to implement suitable recycling technologies throughout the recycling and upgrading processes for plastics and biomass, which are organic solid wastes with complex mixture of components. The conventional pyrolysis and hydropyrolysis were summarized for recycling plastics and biomass into high-value fuels, chemicals, and materials. To enhance reaction efficiency and improve product selectivity, microwave-assisted pyrolysis was introduced to the upgrading of plastics and biomass through efficient energy supply especially with the aid of catalysts and microwave absorbers. This review provides a detail summary of microwave-assisted pyrolysis for plastics and biomass from the technical, applied, and mechanistic perspectives. Based on the recent technological advances, the future directions for the development of microwave-assisted pyrolysis technologies are predicted.

The Development Status of Market of Fermenter for Organic Fertilizer in China

China is a large agricultural country with abundant organic solid waste resources, however it has the characteristics of large amount of resources and low utilization rate. Organic fertilizer fermenter can treat organic solid waste environmentally and effectively. Through literature and data research, this paper summarizes and analyzes the market development status of organic fertilizer fermenter, and summarizes the market characteristics of organic fertilizer fermenters.

Enhanced production of hydrogen-rich gas from municipal sewage sludge gasification using a CaO-RM composite catalyst

Hydrogen-rich gas, characterized by high yield and purity, can be effectively generated through the steam gasification of sewage sludge (SS), offering substantial benefits for organic solid waste treatment and resource conservation. This study evaluated the gasification performance in a horizontal moving-bed reactor employing a wet-mixed CaO-red mud (CaO-RM) composite catalyst. The effects of CaO loading rate (CaO/RM), catalyst-to-SS ratio (CaO-RM/SS), and reaction temperature on the syngas yield, lower heating value (LHV), carbon conversion ratio, H2 to CO (H2/CO) ratio, and H2 yield were investigated. Results indicated that red mud loaded with a calcium-based catalyst significantly enhanced syngas production, particularly for hydrogen generation, during SS gasification. A maximum hydrogen molar fraction of 50.84% and a yield of 7.07 mol/kg were achieved with a CaO/RM of 40% and a CaO-RM/SS of 30% at 750 °C. With the reaction temperature increase from 700 to 900 °C, the catalytic performance for secondary tar cracking and steam reforming was further enhanced. The total syngas yield, H2 yield, hydrogen molar fraction, LHV of syngas, and carbon conversion rate peaked at 0.79 m³/kg, 19.30 mol/kg, 54.41%, 10,249.48 kJ/kg, and 65.67%, respectively, at 900 °C.

Predictable patterns within the kelp forest can indirectly create temporary refugia from ocean acidification

Kelps are recognized for providing many ecosystem services in coastal areas and considered in ocean acidification (OA) mitigation. However, assessing OA modification requires an understanding of the multiple parameters involved in carbonate chemistry, especially in highly dynamic systems. We studied the effects of sugar kelp (Saccharina latissima) on an experimental farm at the north end of Hood Canal, Washington—a low retentive coastal system. In this field mesocosm study, two oyster species (Magallana gigas, Ostrea lurida) were exposed at locations in the mid, edge, and outside the kelp array. The Hood Head Sugar Kelp Farm Model outputs were used to identify dominating factors in spatial and temporal kelp dynamics, while wavelet spectrum analyses helped in understanding predictability patterns. This was linked to the measured biological responses (dissolution, growth, isotopes) of the exposed organisms. Positioned in an area of high (sub)-diel tidal fluxes with low retention potential, there were no measurable alterations of the seawater pH at the study site, demonstrating that the kelp array could not induce a direct mitigating effect against OA. However, beneficial responses in calcifiers were still observed, which are linked to two causes: increased pH predictability and improved provisioning through kelp-derived particulate organic resource utilization and as such, kelp improved habitat suitability and indirectly created refugia against OA. This study can serve as an analogue for many coastal bay habitats where prevailing physical forcing drives chemical changes. Future macrophyte studies that investigate OA mitigating effects should focus also on the importance of predictability patterns, which can additionally improve the conditions for marine calcifiers and ecosystem services vulnerable to or compromised by OA, including aquaculture sustainability.