Hydrogel capsules as carriers for PGPB consortia enhance compost efficacy and nutrient uptake in Oat (Avena sativa) fertilization

IF 4.1 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2025-05-03 DOI:10.1007/s11104-025-07454-y

Mauricio Cruz-Barrera, Martha Chaparro, Jonathan Mendoza, Daniel Torres-Cuesta, Martha Gómez, German A. Estrada-Bonilla

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引用次数: 0

Abstract

Aims

The incorporation of Plant Growth-Promoting Bacteria (PGPB) into compost is a promising strategy to enhance the potential of organic fertilizers. This study investigates in a pot experiment the potential of hydrogel capsules containing a PGPB consortium to improve compost efficiency, promote crop growth, and increase nutrient uptake.

Methods

Three PGPB strains (Rhizobium leguminosarum T88, Herbaspirillum frisingense AP21, and Azospirillum brasilense D7) were encapsulated in hydrogel capsules made from amidated pectin via ionic gelation. Additives like skim milk, whey protein, and Gelita® EC were included. The capsules were characterized using scanning electron microscopy (SEM), moisture content analysis, and particle size measurement. Greenhouse experiments in pots assessed the impact of PGPB-enriched compost on oat growth (Avena sativa var. Altoandina), nutrient uptake, and photosynthetic pigments.

Results

Encapsulated PGPB prototypes P1, P2, and P3 significantly increased shoot and root biomass, compared to the organic fertilization (O.F.) + 50% mineral fertilization (M.F.) treatment with P1 improving root biomass by 74%. In contrast, non-encapsulated treatments showed no significant effects. Encapsulated P1 and P2 enhanced root biomass by 48% and 39% compared to free-living cultures. Nutrient uptake, particularly of N, Ca, and Mg, improved with PGPB encapsulation, with P3 showing the highest increases, N by 81%, Ca by 66%, Mg by 77%. Photosynthetic pigments also rose, with chlorophyll-a increasing by 21% in P3, and chlorophyll-b by 58% in P2.

Conclusions

Encapsulated PGPB significantly enhances compost efficiency, boosting oat biomass, nutrient uptake, and photosynthetic pigment production, supporting sustainable agriculture.

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水凝胶胶囊作为ppgpb菌落载体，可提高燕麦施肥过程中堆肥效率和养分吸收

目的在堆肥中添加植物生长促进菌（PGPB）是提高有机肥潜力的一种很有前途的策略。本研究通过盆栽试验研究了含有PGPB复合物的水凝胶胶囊在提高堆肥效率、促进作物生长和增加养分吸收方面的潜力。方法采用离子凝胶法制备豆科根瘤菌T88、frisingense Herbaspirillum AP21和巴西氮螺旋菌D7 3株PGPB菌包被在改性果胶水凝胶胶囊中。其中包括脱脂牛奶、乳清蛋白和Gelita®EC等添加剂。采用扫描电子显微镜（SEM）、含水量分析和粒度测量对胶囊进行了表征。温室盆栽试验评估了富pgpb堆肥对燕麦（Avena sativa var. Altoandina）生长、养分吸收和光合色素的影响。结果与有机肥(O.F.) + 50%矿物肥（M.F.）处理相比，包封的PGPB样品P1、P2和P3显著提高了茎部和根系生物量，其中P1使根系生物量提高了74%。相比之下，未包封处理无显著影响。与自由培养相比，包封后的P1和P2的根生物量分别提高了48%和39%。PGPB包封提高了氮素、钙和镁的养分吸收，其中P3的增幅最大，氮提高81%，钙提高66%，镁提高77%。光合色素也有所增加，P3的叶绿素-a增加21%，P2的叶绿素-b增加58%。结论PGPB包封后可显著提高堆肥效率，提高燕麦生物量、养分吸收和光合色素产量，支持可持续农业。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.