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<p>The growth strategies used by plants can be influenced by nutrient availability. We aimed to evaluate the allocation of biomass and root morphology traits of tropical legumes under the effects of nitrogen (N) application. Two experiments were conducted where the treatments were three species of legumes: macrotyloma (<i>Macrotyloma axillare</i>), perennial soybean (<i>Neonotonia wightii</i>), and rhizoma peanut (<i>Arachis pintoi</i>); with three doses of N (0, 40 and 80&#xa0;kg&#xa0;ha<sup>−1</sup>) applied at planting. Both experiments took place in a randomized block design, with four and three replications in Experiments I and II, respectively. Biomass allocation in shoots/roots and root morphology were evaluated. In general, macrotyloma presented the greatest biomass allocation in leaves (P &lt; 0.05): average leaf mass (19.69&#xa0;g), leaf area (3,495.0 cm<sup>2</sup>), specific leaf area (SLA) (212.88 cm<sup>2</sup>g<sup>−1</sup>), leaf/branch ratio (1.33), and also had a longer specific root length (SRL) (1326.45 cm<sup>2</sup>g<sup>−1</sup>), although perennial soybean had the greatest root mass (P &lt; 0.0001) (21.90&#xa0;g). In contrast, rhizoma peanut had the largest branch mass (P &lt; 0.0001), and the lowest SLA (89.07 cm<sup>2</sup>g<sup>−1</sup>), and SRL (379.00 cm<sup>2</sup>g<sup>−1</sup>), values in the advanced development stages, associated with plants having a more resource-conservative growth strategy, generating slower growth. Contrarily, the macrotyloma strategy was more resource-acquisitive, and the perennial soybean was positioned between the other two species. The results made it possible to differentiate the growth strategies of the species. The nitrogen application at planting had no mensurable benefits on plant growth and had variable or no effect on biomass allocation and root traits.</p>

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Biomass allocation and growth strategies of tropical forage legumes under effects of nitrogen application at planting

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Jaqueline Silva Colanigo,
  • Ricardo Lopes Dias da Costa,
  • Linda Mônica Premazzi,
  • Karina Batista,
  • Waldssimiler Teixeira de Mattos,
  • Cristina Maria Pacheco Barbosa,
  • Luciana Gerdes,
  • Dixan Pozo Leyva,
  • Fernando Casanova-Lugo,
  • Flavia Maria de Andrade Gimenes

摘要

The growth strategies used by plants can be influenced by nutrient availability. We aimed to evaluate the allocation of biomass and root morphology traits of tropical legumes under the effects of nitrogen (N) application. Two experiments were conducted where the treatments were three species of legumes: macrotyloma (Macrotyloma axillare), perennial soybean (Neonotonia wightii), and rhizoma peanut (Arachis pintoi); with three doses of N (0, 40 and 80 kg ha−1) applied at planting. Both experiments took place in a randomized block design, with four and three replications in Experiments I and II, respectively. Biomass allocation in shoots/roots and root morphology were evaluated. In general, macrotyloma presented the greatest biomass allocation in leaves (P < 0.05): average leaf mass (19.69 g), leaf area (3,495.0 cm2), specific leaf area (SLA) (212.88 cm2g−1), leaf/branch ratio (1.33), and also had a longer specific root length (SRL) (1326.45 cm2g−1), although perennial soybean had the greatest root mass (P < 0.0001) (21.90 g). In contrast, rhizoma peanut had the largest branch mass (P < 0.0001), and the lowest SLA (89.07 cm2g−1), and SRL (379.00 cm2g−1), values in the advanced development stages, associated with plants having a more resource-conservative growth strategy, generating slower growth. Contrarily, the macrotyloma strategy was more resource-acquisitive, and the perennial soybean was positioned between the other two species. The results made it possible to differentiate the growth strategies of the species. The nitrogen application at planting had no mensurable benefits on plant growth and had variable or no effect on biomass allocation and root traits.