Publicado

2021-11-19

Thermal time in nitrogen and boron application on irrigated Mombaça grass “Guinea grass”

Tiempo térmico en la aplicación de nitrógeno y boro en pasto Mombaça de regadío “pasto Guinea”

DOI:

https://doi.org/10.15446/dyna.v88n219.93036

Palabras clave:

degree-days; pasture irrigation; carrying capacity; animal stocking rate; forage yield. (en)
grados-días; riego de pastos; capacidad de carga; tasa de carga animal; rendimiento de forraje. (es)

Autores/as

This study aims to evaluate the correlation among growing degree-days (GDD), canopy height (CH), and leaf area index (LAI) for Guinea grass irrigated, considering the different combinations of the nitrogen and boron rates and cycles of regrowth. The experiment was carried out from August/2017 to August/2018 in a field experiment, and the climate of the region is classified as subtropical. A randomized block design arranged in a factorial scheme (4x3x11) with four replications was used. The treatment was (i) boron fertilization: 0, 1, and 2 kg ha-1; and (ii) nitrogen fertilization: 250, 500, 750, and 1,000 kg ha-1 distributing to 11 growth/cutting cycles. We observed the high correlation between GDD and the parameters evaluated of CH and LAI. The nitrogen results showed a low influence on canopy height and the leaf area index, and boron results did not influence these parameters.

El objetivo fue evaluar la correlación entre los grados-día de crecimiento (GDC), altura del dosel (AD) y índice de área foliar (IAF) para el pasto Guinea irrigado considerando la diferente combinación de las tasas de nitrógeno y boro y los ciclos de rebrote. El experimento se llevó a cabo de agosto/2017 a agosto/2018, en un experimento de campo y la región climática se clasifica como subtropical. Realizó un experimento factorial (4x3x11), con cuatro repeticiones y corrido en un diseño de bloques completamente aleatorio. Tratos: fertilización con boro: 0, 1 y 2 kg ha-1; fertilización con nitrógeno: 250, 500, 750 y 1,000 kg ha-1 distribuidos en 11 ciclos de crecimiento/corta. Hemos observado la alta correlación entre GDC y los parámetros evaluados para AD y IAF. Los resultados de nitrógeno mostraron una baja influencia en la altura del dosel y el índice de área foliar, y los resultados de boro no presentaron influencia en estos parámetros.

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[1]
“Tiempo térmico en la aplicación de nitrógeno y boro en pasto Mombaça de regadío ‘pasto Guinea’”, DYNA, vol. 88, no. 219, pp. 78–84, Nov. 2021, doi: 10.15446/dyna.v88n219.93036.