- 作者: 楊策群
- 作者服務機構: 國立中興大學
- 中文摘要: Pot experiment was carried out to study the direct effect of oxygen concentra-tion in soil on the growth of paddy rice. A sandstone and slate alluvial fine sandyloam soil was used for this study. Soil oxygen concentrations were controlled by aspecially designed irrigation arrangement which supplied irrigation water at severaloxygen tensions. The indirect effects due to nutritional differences and toxic sub-stance as resulted by oxygen concentration difference were minimized by (1) mixingand aerating the out-flow water from all the pots before recycle for irrigation, (2)using water culture solution for irrigation, (3) frequent renewal of irrigation waterand (4) maintaining the same inflow rate for all pots. Results showed that the growth of rice was directly affected by soil oxygenconcentration. At soil oxygen saturations of 18.2, 11.2, 8.9, 6.7, 5.0 and 3.6%, therelative weights of grain per pot were 166, 151, 116, 109, 101 and 100, respectively.A similar pattern was observed between soil oxygen concentration and the total drymatter weight above soil surface. The critical soil oxygen concentration was esti-mated at 11 percent oxygen saturation. Since oxygen tension in most paddy soils weremuch below the critical figure, an increase of yield may be expected through theincrease of soil oxygen concentration.
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