ISHS Acta Horticulturae 592: V International Peach Symposium
EFFECTS OF ENVIRONMENTAL FACTORS ON ACOUSTIC EMISSIONS (AES) IN PEACH TREES |
| Authors: | S. Akasaka, S. Imai, L. Okushima, S. Sase, G.Y. Qiu |
| Keywords: | Prunus persica, fruit tree, quality control, irrigation, water relations |
| Abstract:
To investigate the use of acoustic emissions (AEs) for irrigation and quality control, the effects of environmental factors and several treatments on AEs in potted peach trees were investigated. AEs were detected in the internodes of shoots by an AE transducer in the frequency range of 0.1-1 MHz. When the soil was wet, only a few AEs were detected during the night. However, AEs increased in the morning as photosynthetic photon flux (PPF, 400-700 nm), air temperature and saturation deficit rose, and decreased in the afternoon as they went down. More AEs were detected on sunny days than on cloudy days. The counts of AEs (/h) were highly correlated with PPF, air temperature and saturation deficit. The correlation coefficients between the counts of AEs and these factors were 0.67, 0.89 and 0.88, respectively. The counts of AEs increased as the soil became drier. The counts of AEs (/d) correlated with soil moisture (the correlation coefficient was –0.80). Shading the whole tree at midday completely prevented AEs, but AEs were detected again when the shading was taken off. Defoliation by removal of all leaves also prevented AEs. However, when salt water was used to irrigate the potted tree which had shown few AEs, AEs suddenly increased. These results suggest that AEs from peach trees were affected by environmental factors, especially PPF and water uptake. | |
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