| Responses of sweet potato's photosynthetic characteristics to soil permeability |
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| DOI：10.16302/j.cnki.1000-7601.2015.01.011 |
| Key Words: sweet potato permeability water condition soil texture photosynthetic characteristics water use efficiency |
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| Abstract: |
| Soil permeability had great effect on the growth and the water use efficiency of sweet potato. In this study, responses of photosynthetic characteristics of sweet potato to soil permeability in different soil textures and soil water conditions were observed through a pot experiment. Results indicated that soil permeability had significant effect on the transpiration rate and water use efficiency of sweet potato. When the soil permeability became increased, the transpiration rate became decreased, but the water use efficiency was increased. Also, it seemed that soil permeability did not affect the photosynthetic rate of sweet potato. In addition, it was found that the effects of soil permeability on the transpiration rate and water use efficiency were related to soil compositions. Permeability of sandy soil showed no effect on photosynthetic rate, transpiration rate, and water use efficiency. However, loam soil decreased the transpiration rate and increased the water use efficiency. The effects of soil permeability on the photosynthetic characteristics were also related to the growth period of sweet potato, resulting in various response patterns. These results showed that the impacts of soil texture, water, and growth period must all be taken into consideration when analyzing the responses of crops to soil permeability. |
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