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ABSTRACT: Shifting cultivation with sowing buckwheat seed immediately after burning, when the ash on the soil is still hot, is widely practiced in Kyushu mountains, Japan. This study was conducted to investigate the benefit of seed sowing immediately after burning under well-irrigated and drought conditions on buckwheat. The seeds were heat-treated and allowed to grow under well-irrigated and drought condition. Plant height and leaf number of the plants, and physiological parameters were measured. Under drought stress condition, stomatal conductance and photosynthetic rate of the buckwheat plants with heat treatment were increased compared to those of the plants without heat treatment, though those under well-irrigated or light drought stress conditions were not changed. The plant with heat treatment to seed opened its stomata and maintained a high photosynthetic rate even under drought stress condition. Heat treatment to seed did not change plant height and leaf number noticeably. Therefore, in shifting cultivation, where buckwheat is often exposed to drought stress, seed sowing immediately after burning might be effective in maintaining plant growth.
Keywords: Cross protection, drought stress, heat stress, photosynthetic rate, slash and burn cultivation, stomatal conductance
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