Journal
PLANTS-BASEL
Volume 12, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/plants12173135
Keywords
dry matter; near-infrared spectroscopy; Hass avocado; fruit composition gradient; fruit quality; Persea americana
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Determining the dry matter content in Hass avocados is crucial for harvesting and ensuring fruit quality. The study found a gradient in dry matter content within the fruit and demonstrated the effectiveness of using near-infrared spectroscopy for high-throughput sorting based on commercial quality.
Accurate dry matter determination (DM) in Hass avocados is vital for optimal harvesting and ensuring fruit quality. Predictive models based on NIRS need to capture fruit DM gradient. This work aimed to determine the DM content in Hass avocado whole by NIRS scanning different fruit zones. Spectra were recorded for each zone of the fruit: peduncle (P), equator (E), and base (B). The calibration and validation included fruit from different orchards in two harvest cycles. The results show a DM gradient within the fruit: 24.47% (E), 24.68% (B), and 24.79% (P). The DM gradient was observed within the spectra using the RMSi (root mean square) criterion and PCA. The results show that at least one spectrum per fruit zone was needed to represent the variability within the fruit. The performances of the calibration using the whole set of data were R2: 0.74 and standard error of cross-validation (SECV) = 1.18%. In the validation stage using independent validation sets, the models showed similar performance (R2: 0.75, SECV 1.15%) with low values of the standard error of prediction (SEP): 1.62%. These results demonstrate the potential of near-infrared spectroscopy for high-throughput sorting of avocados based on their commercial quality.
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