Recovery of waste nutrients by duckweed for reuse in sustainable agriculture: Second-year results of a field pilot study with sorghum

Pulido, Carlos; Caballero, Jonathan M.; Bruns, Mary Ann; Brennan, Rachel A.

doi:10.1016/j.ecoleng.2021.106273

Cited by 5 publications

(7 citation statements)

References 13 publications

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“…The fewest variations in biomass within 1 ton dry /ha were seen with sorghum. It is noted that the sorghum yield observed here was different from an earlier study that reported significant differences in sorghum yields (6.7 and 9.89 ton dry /ha with duckweed and fertilizer, respectively) which was attributed to an unexplainable lower seed germination rate with duckweed in that experiment (40% compared to 90% using inorganic fertilizer) [19]. In the current study, Tukey tests showed no significant differences (at alpha = 0.05) between the means of the fresh or dry masses of harvested beet, tomato, and sorghum for the different soil amendments (Table 3).…”

Section: Variation In Crop Yieldcontrasting

confidence: 99%

“…One important conclusion from this analysis is that the lack of statistically significant differences between the leachate generated by the treatment options for most crops can be viewed as positive, particularly when the goal is to substitute existing conventional inorganic fertilizers with a novel amendment material such as duckweed. A previous field experiment growing sorghum with similar treatment options (duckweed, fertilizer, and mix) also showed no significant differences in cumulative NO 3 − -N, NH 4 + -N, and TIN leached (p > 0.05) [19]. The present study therefore further strengthens the hypothesis that duckweed can be used as an alternative to conventional inorganic fertilizers without the risk of increasing nutrient runoff from agricultural fields.…”

Section: Variation In Crop Yieldsupporting

confidence: 82%

“…Its rapid doubling time (between 2 to 4 days) and ease of harvesting make this hyperaccumulator an appealing candidate for use in sustainable wastewater treatment and nutrient recovery [16,18]. Lately, increasing attention has been drawn towards duckweed's varied applications as a fertilizer [19,20], animal feed [21], biofuel feedstock [22,23], and human food [24].…”

Section: Introductionmentioning

confidence: 99%

“…For example, studies have shown that cultivating duckweed in floodwaters of paddy fields can effectively decrease NH 3 volatilization, enhance N bioavailability, and consequently boost crop yields while reducing ammonia emissions by up to 55% compared to conventional fertilizers or wastewater alone [25][26][27][28]. A few field studies have examined duckweed as an alternative amendment for growing sorghum [19,20]. Duckweed-amended sorghum plots were able to retain 30% more total mineral N compared to plots receiving diammonium phosphate (DAP), while leaching 22% less phosphate than DAP and still achieving a comparable sorghum yield [20].…”

Section: Introductionmentioning

confidence: 99%

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Nutrient Cycling with Duckweed for the Fertilization of Root, Fruit, Leaf, and Grain Crops: Impacts on Plant–Soil–Leachate Systems

Fernandez Pulido,

Femeena,

Brennan

2024

Agriculture

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The increasing energy required to synthesize inorganic fertilizers warrants more sustainable soil amendments that produce comparable crop yields with less environmental damage. Duckweed, a prolific aquatic plant, can not only sequester carbon dioxide through photosynthesis, but also hyperaccumulate nutrients from its environment and upcycle them into valuable bioproducts. In this study, dried duckweed, grown on treated wastewater treatment plant effluent, was utilized as a fertilizer for a variety of crops (beet, tomato, kale, and sorghum). Comparative experiments examined the effect of duckweed, inorganic fertilizer, and a 40–60 mix of both on crop yield and nutrient fate in the plants, soil, and leachate. Comparable yields of beet, tomato, and sorghum were generated with duckweed and inorganic fertilizer. Duckweed significantly enhanced phosphorus (P) uptake in sorghum, exhibiting a P use efficiency level of 18.48%, while the mix treatment resulted in the highest P use efficiencies in beet and tomato. Duckweed-amended beet and kale systems also increased residual soil N (0.9% and 11.1%, respectively) and carbon (4.5% and 16.6%, respectively). Linear regression models developed using the data collected from all crops confirmed that duckweed can be used as a substitute for inorganic fertilizer without negative effects to food yield or nutritional quality.

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Section: Variation In Crop Yieldcontrasting

confidence: 99%

Section: Variation In Crop Yieldsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nutrient Cycling with Duckweed for the Fertilization of Root, Fruit, Leaf, and Grain Crops: Impacts on Plant–Soil–Leachate Systems

Fernandez Pulido,

Femeena,

Brennan

2024

Agriculture

Self Cite

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“…Table 4 shows the elemental analysis of the two nitrogen-rich fractions, suggesting that the method employed for S2 is the most favorable to recover the highest nitrogen amount. It is worth noting that both the BSFL fractions shows a nitrogen content well above other sources of nutrients, reported in literature as possible fertilizers, such as duckweed plant or earthworm reared on organic substrate 13,58 (Fernandez Pulido et al, 2021;Lv et al, 2021b).…”

Section: Resultsmentioning

confidence: 73%

Statistical optimization of a sustainable fertilizer composition based on black soldier fly larvae as source of nitrogen

Barbi

Montorsi

Caldironi

et al. 2022

Sci Rep

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In the present work, a statistical optimization of a sustainable coating for core–shell NPK (Nitrogen–Phosphorus–Potassium) fertilizers was investigated. The environmental green coating was enriched in nitrogen using a biomass and renewable source, namely the nitrogen rich fraction of black soldier fly larvae (BSFL) (Hermetia Illucens, Diptera: Stratiomyidae) reared on vegetable waste. A rational approach was proposed with the aim of calculating the best formulation of the coating, considering both its manufacturing behavior, such as adhesion to the core, and its physical properties, such as homogeneity or plasticity. From a circular economy perspective, together with the nitrogen-rich fraction from BSFL (from 51 to 90 wt.%), water and glycerol were considered for the coating formulation in different proportion: from 10 to 32 wt.% and from 0 to 17 wt.% respectively. The Design of Experiments technique was implemented to limit the total number of tests for the coating formulation (18 tests). ANOVA was employed, with the aim of obtaining mathematical models to derive a better precise and objective formulation. The results show that the use of glycerol can be avoided, as well as only a limited amount of water (11 wt.%) is necessary to obtain an optimized coating formulation, thereafter, satisfying the more relevant technological and physical properties for the coating manufacturing.

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Aquatic plant biomass-derived porous carbon: biomaterials for sustainable waste management and climate change mitigation

Singh

Sharma

Dhanorkar

2022

Int. J. Environ. Sci. Technol.

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Recovery of waste nutrients by duckweed for reuse in sustainable agriculture: Second-year results of a field pilot study with sorghum

Cited by 5 publications

References 13 publications

Nutrient Cycling with Duckweed for the Fertilization of Root, Fruit, Leaf, and Grain Crops: Impacts on Plant–Soil–Leachate Systems

Nutrient Cycling with Duckweed for the Fertilization of Root, Fruit, Leaf, and Grain Crops: Impacts on Plant–Soil–Leachate Systems

Statistical optimization of a sustainable fertilizer composition based on black soldier fly larvae as source of nitrogen

Aquatic plant biomass-derived porous carbon: biomaterials for sustainable waste management and climate change mitigation

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