SciELO - Scientific Electronic Library Online

vol.38 número1Identificación y virulencia de Metarhizium anisopliae (Hypocreales: Clavicipitaceae) como agente de control biológico de Rhipicephalus microplus (Acari: Ixodidae) en PanamáNiveles de fertilización inorgánica en tres variedades de kiwicha (Amaranthus caudatus L.) en Ancash, Perú índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




Links relacionados

  • En proceso de indezaciónCitado por Google
  • No hay articulos similaresSimilares en SciELO
  • En proceso de indezaciónSimilares en Google


Idesia (Arica)

versión On-line ISSN 0718-3429


NOGUEIRA MARTINS, Rodrigo et al. Comparison of optical sensors in assessing the nitrogen (N) status in corn. Idesia [online]. 2020, vol.38, n.1, pp.67-73. ISSN 0718-3429.

Nitrogen (N) plays a key role for optimal plant growth and, in particular, for profitable crop production. Optimal N management using optical sensors can provide a rapid assessment of a crop N status. Therefore, this study aimed at comparing the efficiency of two chlorophyll meters in assessing the N status in corn plants when using an economical optimum dose of nitrogen under variable rate application. To do so, a field experiment using a randomized block design with 5 treatments and 5 replicates was carried out in Januária - Brazil (15| 28' 55" S, 44° 22' 41'' W; 474 m) in 2018. Treatments consisted of comparing the pre-fixed N fertilization system with three strategies of variable rate N application using different thresholds of the nitrogen sufficiency index (NSI) in the V4, V8, V10, and V14 vegetative stages. As a result, both chlorophyll meters were capable of detecting the need for N application and differentiating between the plants that received or did not receive N application. In addition, readings from both sensors were highly correlated (> 0.92) from the V6 to the V18 stage. Lastly, both chlorophyll meters were able to identify the crop development variability and could be a suitable tool to monitor the nutritional status and for guiding N fertilization in corn crops.

Palabras clave : chlorophyll meter; nitrogen sufficiency index; site-specific fertilization; Zea mays L.; precision sensing.

        · resumen en Español     · texto en Inglés     · Inglés ( pdf )