Fertilización nitrogenada en Panicum coloratum L. var coloratum : dinámica foliar, macollaje, partición de la biomasa y concentración de nitrógeno
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La combinación de un potencial productivo y la capacidad de asimilación de nutrientes elevados de Panicum coloratum L. var. coloratum., determinarían condiciones para obtener una respuesta favorable a la aplicación de nitrógeno. Los objetivos del presente trabajo fueron cuantificar la respuesta de las siguientes variables: (1) el tamaño y acumulación de lámina foliar, (2) la dinámica de macollaje, (3) la partición de la materia orgánica entre fracción aérea y subterránea, y (4) la concentración, acumulación y eficiencia de uso del nitrógeno (N), bajo la aplicación de diferentes dosis de N. Se ensayaron cuatro dosis de N aplicadas al sustrato edáfico, equivalentes a 0, 40, 80 y 120 kg N ha-1 (N0, N40, N80 y N120, respectivamente), con 8 repeticiones distribuidas en un diseño en bloques al azar. Las plantas fueron cultivadas en macetas tubulares de PVC (11 × 50 cm) desde mediados de marzo. Para iniciar los tratamientos se realizó un corte de las plantas dejando un remanente aéreo de 5 cm, registrándose luego la longitud foliar cada 7 días, y el número de macollos aparecidos y muertos cada 14 días. La aplicación de N incrementó (p<0,05) la longitud final de lámina, la tasa de aparición de hojas, la acumulación de lámina foliar, la biomasa aérea y la longitud del tallo/seudotallo, pero no así (p>0,05) el número de macollos por planta ni la biomasa subterránea. La concentración de N fue mayor (p<0,05) en N120 en relación con el promedio de los restantes tratamientos (2,14 vs 1,90 %; respectivamente). La eficiencia agronómica de uso del N fue similar (p>0,05) entre tratamientos, pero la eficiencia fisiológica de uso del N incrementó (p<0,05) 1,49 veces en N120 respecto a N40. La fertilización con N afectó la estructura de la planta, dando como resultado una mayor acumulación de materia seca con respecto a plantas sin fertilizar. También, incrementó la concentración de N en la materia seca lo cual mejoraría la calidad nutricional de la biomasa aérea, aunque esto podría ser suprimido por el incremento en la proporción seudotallo/tallo. The combination of high productive potential and nutrient assimilation capacity in Panicum coloratum L. var. coloratum would determine conditions to obtain a favorable response to the application of N. The study objectives were to quantify (i) size and accumulation of leaf blade, (ii) tiller dynamics, (iii) organic matter partition between aerial and subterranean fractions, and (iv) N concentration, accumulation and use efficiency, under the application of different N doses. Four nitrogen doses equivalent to 0, 40, 80 and 120 kg N ha-1 (N0, N40, N80 and N120, respectively) were assayed for soil substrates, with 8 replicates distributed in a random block design. The plants were grown in tubular PVC pots (11 × 50 cm) from mid-March. For the beginning of treatments, a cut of plants was made leaving a 5 cm remnant aerial fraction, and then the leaf blade length was recorded every 7 days and the number of emerged and dead tillers every 14 days. The application of N increased (p<0.05) the leaf blade final length, the appearance rate of leaves, the accumulation of leaf blade, aerial biomass and length of the stem/pseudo-stem, but the number of tillers per plant and the underground biomass resulted similar (p>0.05) between treatments. The N concentration was greater (p<0.05) in N120 in relation to the average value for the rest of treatments (2.14 vs 1.90%; respectively). The agronomic N use efficiency was similar (p>0.05) between treatments, but the physiological N use efficiency increased (p<0.05) by 1.49 times in N120 compared to N40 treatment. Fertilization with N affected the plant structure, giving way to a greater dry matter accumulation in comparison to plants without fertilization. It also increased The combination of high productive potential and nutrient assimilation capacity in Panicum coloratum L. var. coloratum would determine conditions to obtain a favorable response to the application of N. The study objectives were to quantify (i) size and accumulation of leaf blade, (ii) tiller dynamics, (iii) organic matter partition between aerial and subterranean fractions, and (iv) N concentration, accumulation and use efficiency, under the application of different N doses. Four nitrogen doses equivalent to 0, 40, 80 and 120 kg N ha-1 (N0, N40, N80 and N120, respectively) were assayed for soil substrates, with 8 replicates distributed in a random block design. The plants were grown in tubular PVC pots (11 × 50 cm) from mid-March. For the beginning of treatments, a cut of plants was made leaving a 5 cm remnant aerial fraction, and then the leaf blade length was recorded every 7 days and the number of emerged and dead tillers every 14 days. The application of N increased (p<0.05) the leaf blade final length, the appearance rate of leaves, the accumulation of leaf blade, aerial biomass and length of the stem/pseudo-stem, but the number of tillers per plant and the underground biomass resulted similar (p>0.05) between treatments. The N concentration was greater (p<0.05) in N120 in relation to the average value for the rest of treatments (2.14 vs 1.90%; respectively). The agronomic N use efficiency was similar (p>0.05) between treatments, but the physiological N use efficiency increased (p<0.05) by 1.49 times in N120 compared to N40 treatment. Fertilization with N affected the plant structure, giving way to a greater dry matter accumulation in comparison to plants without fertilization. It also increasedThe combination of high productive potential and nutrient assimilation capacity in Panicum coloratum L. var. coloratum would determine conditions to obtain a favorable response to the application of N. The study objectives were to quantify (i) size and accumulation of leaf blade, (ii) tiller dynamics, (iii) organic matter partition between aerial and subterranean fractions, and (iv) N concentration, accumulation and use efficiency, under the application of different N doses. Four nitrogen doses equivalent to 0, 40, 80 and 120 kg N ha-1 (N0, N40, N80 and N120, respectively) were assayed for soil substrates, with 8 replicates distributed in a random block design. The plants were grown in tubular PVC pots (11 × 50 cm) from mid-March. For the beginning of treatments, a cut of plants was made leaving a 5 cm remnant aerial fraction, and then the leaf blade length was recorded every 7 days and the number of emerged and dead tillers every 14 days. The application of N increased (p<0.05) the leaf blade final length, the appearance rate of leaves, the accumulation of leaf blade, aerial biomass and length of the stem/pseudo-stem, but the number of tillers per plant and the underground biomass resulted similar (p>0.05) between treatments. The N concentration was greater (p<0.05) in N120 in relation to the average value for the rest of treatments (2.14 vs 1.90%; respectively). The agronomic N use efficiency was similar (p>0.05) between treatments, but the physiological N use efficiency increased (p<0.05) by 1.49 times in N120 compared to N40 treatment. Fertilization with N affected the plant structure, giving way to a greater dry matter accumulation in comparison to plants without fertilization. It also increasedThe combination of high productive potential and nutrient assimilation capacity in Panicum coloratum L. var. coloratum would determine conditions to obtain a favorable response to the application of N. The study objectives were to quantify (i) size and accumulation of leaf blade, (ii) tiller dynamics, (iii) organic matter partition between aerial and subterranean fractions, and (iv) N concentration, accumulation and use efficiency, under the application of different N doses. Four nitrogen doses equivalent to 0, 40, 80 and 120 kg N ha-1 (N0, N40, N80 and N120, respectively) were assayed for soil substrates, with 8 replicates distributed in a random block design. The plants were grown in tubular PVC pots (11 × 50 cm) from mid-March. For the beginning of treatments, a cut of plants was made leaving a 5 cm remnant aerial fraction, and then the leaf blade length was recorded every 7 days and the number of emerged and dead tillers every 14 days. The application of N increased (p<0.05) the leaf blade final length, the appearance rate of leaves, the accumulation of leaf blade, aerial biomass and length of the stem/pseudo-stem, but the number of tillers per plant and the underground biomass resulted similar (p>0.05) between treatments. The N concentration was greater (p<0.05) in N120 in relation to the average value for the rest of treatments (2.14 vs 1.90%; respectively). The agronomic N use efficiency was similar (p>0.05) between treatments, but the physiological N use efficiency increased (p<0.05) by 1.49 times in N120 compared to N40 treatment. Fertilization with N affected the plant structure, giving way to a greater dry matter accumulation in comparison to plants without fertilization. It also increased the N concentration in the dry matter which would improve the nutritional quality of aerial biomass. However that effect could be suppressed by the increase in the proportion pseudostem/stem.
Autor/a
Alonso, Alexis
Trelles, Leonardo Elián
Director/a
Ferri, Carlos María;
Jouve, Varinia Vilma (jurado)
Pagella, José Horacio (jurado)
Pagella, José Horacio (jurado)
Fecha
2018Tipo de documento
tesis
Subtipo de documento
trabajo final
trabajo final
dc.language.iso
spa
Palabras clave
Gramínea perenne de crecimiento estival; Morfogénesis; Tamaño foliar; Filocrono;
Keywords
Warm-season grass; Morphogenesis.; Leaf size; Phylocrono;
Materias
Agricultura : : Cultivos : : Forraje;
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https://repo.unlpam.edu.ar/handle/unlpam/1388Registros en colección
- Tesisg [1927]