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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

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.  http://dx.doi.org/10.4067/S0718-34292020000100067.

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.

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