Environmental and economic benefits of substituting chemical potassium fertilizer with crop straw residues in China

Yin, Junhui; Li, Dongjia; Yu, Jingquan; Bai, Xiangzhi; Cui, Wenjing; Liu, Rui; Zhuang, Minghao

doi:10.1007/s11356-022-24128-9

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…Microbial-based fertilizers offer a solution to mitigate the environmental harm caused by excessive or improper use of chemical fertilizers, enhancing both direct and indirect plant uptake of macro-and micro-nutrients (Atieno et al, 2020). Moreover, chemical fertilizers can adversely affect the quality and safety of water, soil, and air resources, not only through their application in agriculture but also as a result of their production processes (Yin et al, 2022;Aso, 2024).…”

Section: Introductionmentioning

confidence: 99%

The potential use of brewers' spent grain-based substrates as horticultural bio-fertilizers

Bianco,

Melito,

Garau

et al. 2024

Front. Sustain. Food Syst.

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IntroductionBrewers' spent grain (BSG) is the most important by-product of breweries. Currently, the primary method of recycling BSG is through its use in livestock feed production, due to its high fiber content, non-degradable protein, and water-soluble vitamins. Nonetheless, composting, vermicomposting, and biochar production pathways offer promising alternatives for managing this organic byproduct.MethodsBSG-based substrates were evaluated as bio-fertilizers for use during the transplantation of Lactuca sativa L. and without additional fertilization at the end of the crop cycle. Biochar (B), vermicompost (V), compost (CP), and compost enriched with a microbial consortium (CPE), each mixed at 2 and 4% with peat, were compared with two control treatments: 100% peat (C1) and peat with ternary chemical fertilizer (C2). The experiment was designed with six replicates, half of which were inoculated with Sclerotinia sclerotiorum mycelium during transplantation to assess the contribution of different substrates to pathogen resistance.ResultsOverall, it was found that the control treatment C2 was the most effective, yielding the greatest plant height at the seedbed stage and the best results across all parameters at harvest. The V 4%, CP 4%, and CPE 4% treatments showed similar results without significant differences compared to the control. At the end of the seedbed phase, plants treated with CP 4% and CPE 4% exhibited the most substantial root development, with statistically significant differences from all other treatments. Moreover, the CPE 4% treatment demonstrated superior performance, resulting in statistically significant differences (p < 0.05) in the chlorophyll content (α and β) and carotenoid parameters when compared to the control treatment C2. The interaction between the treatment and the pathogen was statistically significant only for the carotenoid content in the CPE 4% treatment and for the flavonoid content in most of the treatments.DiscussionThe most promising results were obtained at the nursery phase, highlighting the potential use of processed BSG-based substrates as bio-fertilizers. These products provided plants with both a growth substrate and nutrients, effectively contributing to waste recycling and aligning with the principles of a circular economy. Additional studies are required to investigate the potential use of brewer's spent grain as bio-fertilizers in other vegetable crop species.

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Section: Introductionmentioning

confidence: 99%

The potential use of brewers' spent grain-based substrates as horticultural bio-fertilizers

Bianco,

Melito,

Garau

et al. 2024

Front. Sustain. Food Syst.

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“…Compared to enclosures, cutting roots usually increases the nutrient content of the top soil. This is because root cutting is usually associated with reduced plant growth, which results in more plant roots and residues in the surface soil, providing more organic matter to release potassium [27] and increasing the soil total potassium content. Potassium is typically present in a soluble form within plants, and plants absorb soluble potassium from the soil through their roots.…”

Section: Mechanisms Of the Effects Of Different Restoration Methods O...mentioning

confidence: 99%

Investigation into the Effects of Different Restoration Techniques on the Soil Nutrient Status in Degraded Stipa grandis Grassland

Zhang,

Yu,

Shan

et al. 2023

Agronomy

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The degradation and desertification of grassland ecosystems have garnered significant attention both domestically and internationally. Grassland restoration techniques are widely considered a principal measure to promote the sustainable utilization of grasslands, with soil nutrient content being a core indicator for assessing the effectiveness of restoration in degraded grasslands. This study aims to explore the differential impacts of various grassland restoration methods on soil nutrient distribution in degraded Stipa grandis grasslands. Three major restoration methods, i.e., root cutting, enclosure, and fertilization, were applied in the study area. The soil nutrient content was measured and analyzed under the different restoration methods and at varying depths. The results revealed that under all three restoration methods and at different soil depths (0–10 cm, 10–20 cm, 20–30 cm), the organic matter, total nitrogen, total phosphorus, alkali-hydrolyzable nitrogen, alkali-hydrolyzable phosphorus, and available potassium contents were significantly higher than those in the control group (p < 0.05). Furthermore, as soil depth increased, the contents of organic matter and all nutrients gradually decreased. Specifically, regarding the contents of different nutrients, the order of organic matter, total nitrogen, total phosphorus, alkali-hydrolyzable nitrogen, and available phosphorus was as follows: fertilization > enclosure > root cutting > control, while the contents of total potassium and available potassium followed the sequence: fertilization > enclosure > control > root cutting. Additionally, based on the canonical correlation analysis (R2 = 0.88), the total phosphorus content in soil had the greatest impact on soil nutrients, while vegetation cover and plant height contributed the most to vegetation characteristics. In grassland restoration, the increase in soil total phosphorus led to higher vegetation cover and height, mildly influenced plant diversity and density, and simultaneously promoted biomass accumulation. These research findings provide a solid theoretical foundation for the application of grassland restoration techniques, contributing to the sustainable development of grassland ecosystems.

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“…[38] As an essential organic fertilizer resource, straw is rich in N, P, and K nutrients (Table 2). SR inevitably increases the content of the aforementioned nutrients in the soil and shows immense potential for replacing chemical fertilizers [11,39], which can significantly improve agricultural quality and efficiency and reduce environmental risks [40,41]. Drawing on official statistics and the literature, Liu and Li [42] analyzed straw resources and N, P, and K nutrient resources in China between the 1980s and the 2010s.…”

Section: Straw Types and Nutrients-an Overviewmentioning

confidence: 99%

The Fate and Challenges of the Main Nutrients in Returned Straw: A Basic Review

Li,

Jiao

et al. 2024

Agronomy

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Due to containing an abundance of essential nutrients, straw has significant potential to mitigate carbon (C), nitrogen (N), phosphorus (P), and potassium (K) deficits in soil. However, a lack of comprehensive and systematic reviews on C, N, P, and K release and conversion from straw and on the impact of available nutrients in soils supplemented using straw-returning (SR) practices is noticeable in the literature. Therefore, we investigated straw decomposition, its nutrient release characteristics, and the subsequent fate of nutrients in soils. At early stages, straw decomposes rapidly and then gradually slows down at later stages. Nutrient release rates are generally in the K > P > C > N order. Nutrient fate encompasses fractions mineralized to inorganic nutrients, portions which supplement soil organic matter (SOM) pools, and other portions which are lost via leaching and gas volatilization. In future research, efforts should be made to quantitatively track straw nutrient release and fate and also examine the potential impact of coordinated supply-and-demand interactions between straw nutrients and plants. This review will provide a more systematic understanding of SR’s effectiveness in agriculture.

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Environmental and economic benefits of substituting chemical potassium fertilizer with crop straw residues in China

Cited by 10 publications

References 37 publications

The potential use of brewers' spent grain-based substrates as horticultural bio-fertilizers

The potential use of brewers' spent grain-based substrates as horticultural bio-fertilizers

Investigation into the Effects of Different Restoration Techniques on the Soil Nutrient Status in Degraded Stipa grandis Grassland

The Fate and Challenges of the Main Nutrients in Returned Straw: A Basic Review

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