The effect of irrigation on harvest maturity of mango as determined by near infrared spectroscopy (NIR)

Publikations-Art

Kongressbeitrag

Autoren

Rungpichayapichet P, Mahayothee B, Nagle M, Haewsungcharern M, Janjai S, Müller J

Erscheinungsjahr

2008

Veröffentlicht in

Proceedings of The First Asian NIR Symposium

Seite (von - bis)

1-2

Tagungsname

First Asian NIR Symposium

Tagungsort

Tsukuba (Japan)

Tagungsdatum

12.11.2008

Schlagworte

Bewässerung, Mango

Fruit set and growth development of mango takes place during the dry season in Thailand. Irrigation is, therefore, commonly applied in the field. The influence of irrigation on near infrared (NIR) measurements for determining the harvest maturity of mangos cv. Chok Anan was evaluated. Irrigation experiments were performed on 72 fully irrigated and 72 non-irrigated trees. Twelve fruits were harvested off 6 trees from each treatment on 85, 97, 100, 103, 106 and 109 days after full bloom. The NIR spectra from 700-1140 nm were scanned on both sides of each fruit using a portable NIR. Afterwards, total soluble solids (TSS), titratable acidity (TA), and firmness of the same fruit were determined using conventional destructive methods. From qualitative assessment using Principal Component Analysis (PCA), the spectral information was found not to differentiate between irrigated and non-irrigated mangos. The NIR spectra (original and second derivatives) of both irrigated and non-irrigated mangos and the physical and chemical data were further subjected to multivariate calibration techniques using Partial Least Squares (PLS). Among the parameters studied, TA was the most adequate quality attribute for building the model with second derivative spectra (R= 0.73, SEC=0.16, SEP=0.18). Irrigation was found not to affect the monitoring of harvest maturity of mango by NIR.