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<p>This study focused on the use of aqueous extracts from the microalgae <i>Tetradesmus obliquus</i> and <i>Chlorella vulgaris</i> in agriculture, specifically on the common bean (<i>Phaseolus vulgaris</i>) crop. Monocultures of both microalgae species were cultivated on a small scale in the laboratory to produce the extracts. The experimental setup involved randomized blocks in a factorial design. Initially, common bean seeds were treated with the aqueous extracts of <i>T. obliquus</i> and <i>C. vulgaris</i> at a dose of 3&#xa0;mg&#xa0;kg seed<sup>–1</sup>. Later on (31&#xa0;days after planting), the bean plants received a foliar treatment with the extracts at a dose of 3.0&#xa0;g&#xa0;ha<sup>–1</sup>. A control group was also included in the study. Each experimental group had four replicates, totaling 36 experimental units, and the cultivation period lasted 83&#xa0;days. The results showed a significant interaction (p = 0.045) between seed treatment and foliar application, particularly in the leaf area index during the reproductive phase of the common bean. Seed treatment had a notable impact on various agronomic indices of the common bean. The aqueous extracts of <i>T. obliquus</i> and <i>C. vulgaris</i> led to increased plant height (38.82 ± 0.64 and 39.83 ± 0.82&#xa0;cm, respectively), number of pod per plant (9.82 ± 0.40 and 11.65 ± 0.87, respectively), yield (811.67 ± 34.57 and 865.32 ± 31.70&#xa0;kg&#xa0;ha<sup>−1</sup>, respectively), and other indices when applied as seed treatments. The <i>C. vulgaris</i> extract specifically enhanced the number of nodules per plant (41.42 ± 4.50) and the dry mass of the nodules (70.42 ± 6.46&#xa0;mg) compared to the control group. However, foliar application of the extracts did not yield significant effects (p &gt; 0.05). Despite excessive rainfall, the yield of black beans increased by 31.54% with <i>T. obliquus</i> seed treatment and 40.24% with <i>C. vulgaris</i> seed treatment, indicating the effectiveness of the aqueous extracts for both species. Future studies should explore different dosages for foliar application of these microalgae in beans, as well as in other leguminous plants varieties.</p>

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Aqueous extracts of Tetradesmus obliquus and Chlorella vulgaris microalgae enhanced the yield of common bean (Phaseolus vulgaris): A field study

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Vinícius Cordeiro de Moraes,
  • Lilyan Barbara Ruivo,
  • Jesiane Stefania da Silva Batista,
  • Michele Cristina Vieira,
  • Rafael Garcia Lopes,
  • Marco Shizuo Owatari,
  • Roberto Bianchini Derner,
  • Silvana Ohse

摘要

This study focused on the use of aqueous extracts from the microalgae Tetradesmus obliquus and Chlorella vulgaris in agriculture, specifically on the common bean (Phaseolus vulgaris) crop. Monocultures of both microalgae species were cultivated on a small scale in the laboratory to produce the extracts. The experimental setup involved randomized blocks in a factorial design. Initially, common bean seeds were treated with the aqueous extracts of T. obliquus and C. vulgaris at a dose of 3 mg kg seed–1. Later on (31 days after planting), the bean plants received a foliar treatment with the extracts at a dose of 3.0 g ha–1. A control group was also included in the study. Each experimental group had four replicates, totaling 36 experimental units, and the cultivation period lasted 83 days. The results showed a significant interaction (p = 0.045) between seed treatment and foliar application, particularly in the leaf area index during the reproductive phase of the common bean. Seed treatment had a notable impact on various agronomic indices of the common bean. The aqueous extracts of T. obliquus and C. vulgaris led to increased plant height (38.82 ± 0.64 and 39.83 ± 0.82 cm, respectively), number of pod per plant (9.82 ± 0.40 and 11.65 ± 0.87, respectively), yield (811.67 ± 34.57 and 865.32 ± 31.70 kg ha−1, respectively), and other indices when applied as seed treatments. The C. vulgaris extract specifically enhanced the number of nodules per plant (41.42 ± 4.50) and the dry mass of the nodules (70.42 ± 6.46 mg) compared to the control group. However, foliar application of the extracts did not yield significant effects (p > 0.05). Despite excessive rainfall, the yield of black beans increased by 31.54% with T. obliquus seed treatment and 40.24% with C. vulgaris seed treatment, indicating the effectiveness of the aqueous extracts for both species. Future studies should explore different dosages for foliar application of these microalgae in beans, as well as in other leguminous plants varieties.