Relationship between vegetation indices and agronomic performance of maize varieties under different nitrogen rates
Precision agriculture is a set of techniques that assist the monitoring of the agronomic performance of the maize crop by using vegetation indices. This study aimed to verify the relationship between vegetation indices, plant height, leaf N content, and grain yield of three maize varieties, grown under high and low N as topdressing. The experiment was carried out at the Fundação de Apoio à Pesquisa Agropecuária de Chapadão (Fundação Chapadão), located in the municipality of Chapadão do Sul, during the 2017/2018 season. The experiment consisted of a randomized block design with four replications, arranged in a 3x2 split-plot scheme. The first factor (plots) corresponded to three open-pollinated maize varieties (BRS 4103, BRS Gorotuba, and SCS 154), and the second factor (subplots) consisted of two N rates applied as topdressing (80 and 160 kg- 1). All the evaluated variables showed varieties x N interaction. Vegetation indices in maize varieties were influenced by the N rate applied as topdressing. Normalized Difference Vegetation Index (NDVI) and Soil-adjusted Vegetation Index (SAVI) showed a higher correlation with plant height. At the same time, Normalized Difference Red Edge (NDRE) had a stronger association with leaf N content.
The Bioscience Journal uses the Creative Commons (CC) license, thus preserving the integrity of the articles in an open-access environment and ensuring the rights of the authors:
- The publication reserves the right to make normative, spelling, and grammar changes in the original documents to maintain a refined standard language but respecting the style of the authors;
- The original documents will not be returned to the authors;
- The authors hold all the rights to their work published in the Bioscience Journal and their full or partial reprint. Deposit or republication is subject to the express authorization from the editor of the journal, fomented through the CC-BY license;
- The original source of publication should be acknowledged;
- The opinions expressed by the authors of the articles are their sole responsibility.