Spatial correlation between the chlorophyll index and foliar npk levels in coffee crop

Authors

Abstract

Detection of spatial variability of data that can improve crop management is a key factor for precision agriculture. In agriculture, there is a need for tools to assist farmers in making decisions about the proper nutrient management, aiming their full productive potential. The use of portable and easy-to-use sensors has facilitated the collection of data, as they are more agile and cost-effective. Thus, the SPAD® chlorophyll meter is an alternative to generate the chlorophyll index (CI), which is easily obtainable and non-destructive sampling. In this context, this study aimed to determine the spatial correlations between the CI and nitrogen, phosphorus and potassium (NPK) foliar contents in the coffee crop using geostatistical tools. The CI showed a moderate spatial correlation with N, showing potential to be used in precision coffee farming. Differently, for potassium, the use of CI is not recommended, as they presented the lower spatial correlation. As a tool that performs an indirect measurement, the results should be validated by field measurements to local calibrations.

Key words: Optical sensor; precision agriculture; mapping; geostatistics; Coffea arabica L.

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Published

2020-09-04

How to Cite

ZANELLA, M. A.; RODRIGUES JUNIOR, F. A. .; DOS SANTOS SOUSA, E. D. T. .; NOGUEIRA MARTINS , R. .; CALIJURI, M. L. . Spatial correlation between the chlorophyll index and foliar npk levels in coffee crop. Coffee Science - ISSN 1984-3909, v. 15, p. e151765, 4 Sep. 2020.