Effects of floating ball on the growth of lotus (Nelumbo nucifera) and yield of lotus root on shallow soil cultivation system
2019
Mizobuchi, S. (Ehime University (Japan). Faculty of Agriculture) | Toma, Y. | Ueno, H.
This study investigated the effect of floating balls (diameter in 80 mm, white color) made of polyester on lotus growth and lotus root yield in a shallow soil cultivation system from April to September 2018. Lotus growth was improved by the increased soil temperature owing to the utilization of floating balls on paddy water, because sensible heat inflow was induced through a thermal insulation effect and by suppressing evaporation of paddy water. Furthermore, increasing soil temperature may enhance the subterranean stem division, thereby, increasing the number of lotus roots resulting in increased lotus root yield. Covering the surface area of the paddy field also contributed to reducing irrigation water requirement. In addition to the utilization of floating balls, application of supplemental nitrogen fertilizer after the blooming stage might further increase lotus root yield, because increasing leaf chlorophyll content in emergent leaves increased lotus root during the thickening stage.
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