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Open AccessArticle

Adjusting Ceptometer Data to Improve Leaf Area Index Measurements

1
Department of Soil Physics and Water Management, Institute for Soil Sciences and Agricultural Chemistry, Centre for Agricultural Research, Herman O. St. 15, 1022 Budapest, Hungary
2
Crop Production Department, Agricultural Institute, Centre for Agricultural Research, Brunszvik u. 2, 2462 Martonvásár, Hungary
*
Author to whom correspondence should be addressed.
Agronomy 2019, 9(12), 866; https://doi.org/10.3390/agronomy9120866
Received: 25 September 2019 / Revised: 23 November 2019 / Accepted: 9 December 2019 / Published: 10 December 2019
Leaf Area Index (LAI) is an important plant parameter for both farmers and plant scientists to monitor and/or model the growth and the well-being of plants. Since direct LAI measurement techniques are relatively laborious and time-consuming, various indirect methods have been developed and widely used since the early 1990s. The LP-80 ceptometer uses a linear array of PAR (photosynthetically active radiation) sensors for non-destructive LAI measurements that is backed by 15 years of research. Despite this, considerable discrepancy can be found between the expert opinions regarding the optimal illumination conditions recommended for the measurement. The sensitivity of ceptometer-based LAI values to PAR was investigated, and a simple method was devised to correct raw ceptometer data collected under non-ideal light conditions. Inadequate light conditions (PAR < 1700 µmol m−2 s−1) could cause an underestimation of LAI. Using the corrected LAI values, the ceptometer data showed a significantly better fit (higher R2, smaller mean average error and closer to zero mean signed error values) to the destructive LAI data for both wheat and maize. With the help of the correction equations, the use of the LP-80 ceptometer could be extended to days when light conditions are not ideal. View Full-Text
Keywords: LAI; ceptometer; light conditions; PAR; correction LAI; ceptometer; light conditions; PAR; correction
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Pokovai, K.; Fodor, N. Adjusting Ceptometer Data to Improve Leaf Area Index Measurements. Agronomy 2019, 9, 866.

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