Abstract
The effects of clipping of daughter tuber leaves of eddoe plants (Colocasia esculenta Schott, var. antiquorum Hubbard, cv. Uhan) on dry matter production, canopy photosynthesis and tuber yield were investigated. The clipping of daughter tuber leaves resulted in different vertical canopy structure and different light distribution within the canopy. In the row-base of the non-clipped plot, relative light intensity was 10% lower than in the clipped plot. In the non-clipped plot, net photosynthetic rate of eddoe plant reached 4.9g CO2 m-2 h-1, while in the clipped plot, it reached only 2.7g CO2 m-2 h-1. The non-clipped plot attained a total tuber yield of 1844g m-2 but the clipped plot reduced tuber yield approximately by 25%. We presume that the canopy of the non-clipped plot intercepted more light due to higher LAI (leaf area index) than the clipped plants. The higher LAI and higher light interception of non-clipped plants resulted in higher photosynthesis and higher dry matter production and hence higher tuber yield than in the clipped plot.The present experiment concluded that daughter tuber leaves have a great contribution to the canopy photosynthesis and to promoting thickening growth of tuber. Therefore, it would be better not to clip daughter tuber leaves for obtaining higher tuber yield.
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