砂質土壌でのサツマイモの成長におよぼす土壌含水率の影響

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With the aim of developing efficient methods for sweet potato production in arid or semi-arid regions, we investigated effects of soil water content in the root zone on the growth and yield of sweet potato grown in sandy soil. In the first experiment with potted plants, the effects of soil water content on the leaf stomatal conductance of sweet potato were compared with four other agricultural plant species in order to examine the drought tolerance level of sweet potato. The soil water content were controlled by different irrigation regimes. The results showed that sweet potato after a period of drought stress had the ability to quickly increase its leaf conductance after re-watering. In the second experiment, sweet potato was grown in containers filled with sandy soil and water table levels in soil were maintained at 15 cm (treatment code: D15), 20 cm (D20), 25 cm (D25) and 30 cm (D30) from the soil surface. The volumetric water content and O2 and CO2 concentrations in sandy soil were monitored periodically. Water table depth in sandy soil affected soil volumetric water content and O2 and CO2 concentrations in the root zone. The soil volumetric water content and soil CO2 concentration at 15 cm depth from the soil surface varied from 7% to 46% and 0.8 to 2.7%, respectively, in the following order: D15 > D20 > D15 > D30. Tuberous root dry mass were the greatest in D25 and the least in D30, and the decreasing order of the ratio of root dry mass to whole-plant dry mass was D25 > D20 > D15 > D30. In conclusion, tuberous root production of sweet potato can be promoted by maintaining sufficient distance of the water table from the soil surface to keep volumetric water content at 10-15% and low CO2 concentrations in sandy soil with the bottom irrigation system.
生態工学会の論文

砂質土壌でのサツマイモの成長におよぼす土壌含水率の影響

スポンサーリンク

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