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Aims <p>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.</p> Methods <p>Three PGPB strains (<i>Rhizobium leguminosarum</i> T88, <i>Herbaspirillum frisingense</i> AP21, and <i>Azospirillum brasilense</i> 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 (<i>Avena sativa</i> var. Altoandina), nutrient uptake, and photosynthetic pigments.</p> Results <p>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.</p> Conclusions <p>Encapsulated PGPB significantly enhances compost efficiency, boosting oat biomass, nutrient uptake, and photosynthetic pigment production, supporting sustainable agriculture.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月3日

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

摘要

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.