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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Optimización de la producción de rábano (Raphanus sativus L.) mediante fuentes alternativas de nitrógeno

V A Targino1, T J Dias1, V F O Sousa2

  • 1Universidade Federal da Paraíba, Areia, PB, Brasil.

Brazilian journal of biology = Revista brasleira de biologia
|February 4, 2026
PubMed
Resumen
Este resumen es generado por máquina.

La fertilización nitrogenada impacta significativamente el crecimiento del rábano. La urea a 15 kg/ha es la más eficaz para mejorar el rendimiento y desarrollo del rábano, optimizando el uso de nutrientes y reduciendo el impacto ambiental.

Palabras clave:
RábanoNitrógenoFertilizaciónUreaRendimientoCrecimiento vegetalAgronomía

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Área de la Ciencia:

  • Agronomía
  • Fisiología Vegetal
  • Ciencias del Suelo

Sus antecedentes:

  • El rábano (Raphanus sativus) es una hortaliza de raíz rica en nutrientes adecuada para la rotación de cultivos.
  • La optimización de la fertilización con nitrógeno (N) es crucial para el desarrollo del rábano, minimizando las pérdidas por lixiviación, el daño ambiental y los costos de producción.

Objetivo del estudio:

  • Evaluar los efectos de diferentes fuentes y dosis de nitrógeno (N) en el crecimiento y la fisiología del rábano.
  • Determinar la estrategia óptima de fertilización con N para maximizar el rendimiento y la calidad del rábano.

Principales métodos:

  • En un experimento de invernadero se utilizó un diseño de bloques al azar con un arreglo factorial 2x5.
  • Los tratamientos incluyeron dos fuentes de N (urea y sulfato de amonio) y cinco dosis (0, 15, 30, 45, 60 kg N/ha).
  • Se evaluaron parámetros como altura de planta, biomasa, área foliar, intercambio de gases, contenido de clorofila y fluorescencia.

Principales resultados:

  • Las fuentes y dosis de nitrógeno influyeron positivamente en el crecimiento del rábano.
  • La aplicación de urea mostró una mayor eficiencia en la promoción del crecimiento de las plantas y los índices de clorofila (clorofila a y clorofila total).
  • La fertilización con 15 kg N/ha de urea produjo el aumento más significativo en el crecimiento y la producción de rábano.

Conclusiones:

  • La urea es una fuente de nitrógeno más eficaz para el cultivo de rábano en comparación con el sulfato de amonio.
  • Se recomienda una tasa de aplicación de 15 kg N/ha de urea para un crecimiento y rendimiento óptimos del rábano.
  • La fertilización estratégica con nitrógeno puede mejorar la productividad del rábano y al mismo tiempo mitigar los riesgos ambientales.