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ISHS Acta Horticulturae 1112: XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014): International Symposia on Water, Eco-Efficiency and Transformation of Organic Waste in Horticultural Production

Evaluation of the effect of soil moisture condition on crop bioelectrical potential

Authors:   K. Yuge, M. Anan, K. Hamagami, K. Hamada
Keywords:   water consumption, water stress, irrigation regime, wavelet analysis, environmental response, SPA (Speaking Plant Approach)
DOI:   10.17660/ActaHortic.2016.1112.35
Abstract:
The objective of this study was to evaluate the effect of soil moisture condition on the bioelectric potential of a crop. The bioelectric potential of broccoli (Brassica oleracea var. italica) plants was measured under different soil moisture conditions and growth stages using pot experiments (Fukuoka, Japan in 2011). To more accurately clarify the relationship among the changes in bioelectric potential, soil moisture, and crop growth stage, a wavelet analysis was performed. The results showed that the bioelectric potential changed as a function of both soil moisture between pF 1.5 and 2.8 and crop growth stage. Further, the dominant frequency band under wet soil condition at the initial growth stage had a large wavelet coefficient compared with the results obtained under the dry soil condition. In the crop mid-growth stage, the wavelet conversion chart obtained using the data from the dry soil condition had the characteristic of the low frequency band compared with results obtained for the wet soil condition. The results showed that the growth stage and soil moisture condition both affect the crop bioelectric potential. Managing optimal soil moisture conditions by considering changes in crop bioelectric potential will likely facilitate the optimization of irrigation regimes in crop growth stages.

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