240-4 A Simple Method to Estimate the LEAF Area INDEX Using Digital Camera in Irrigated Processing Tomato.
Poster Number 237
See more from this Division: ASA Section: Climatology & ModelingSee more from this Session: General Agroclimatology and Agronomic Modeling: II
Tuesday, November 4, 2014
Long Beach Convention Center, Exhibit Hall ABC
The leaf area index (LAI) is important information used in crop modellings. Usually, the LAI is obtained by destructive method with LI-COR equipment. The objective of this research was to develop a non-destructive method that uses photographs taken in situ and a public domain software (ImageJ). To validate the method, we used the irrigated processing tomato crop. Samples were taken at 15, 30, 45, 60, 75, 105, 130 days after planting. For the photographic method a ruler of 1m2 was placed on the soil in 24 randomized sampling points, and for each point a photograph was taken. For each point, one plant was collected to obtain the LAI through the LI-COR method. The photographs were processed in ImageJ for LAI estimation. The comparison with destructive (LI-COR) and non-desctructive (photo) methods was evaluated by the mean absolute percentage error (MAPE), a measurement of accuracy, and R2, a measurement of precision. The photographic method had high accuracy and precision, the MAPE and R2 were 0.4% and 0.94, respectively.
See more from this Division: ASA Section: Climatology & ModelingSee more from this Session: General Agroclimatology and Agronomic Modeling: II