Effect of Soil Compaction on Dry Matter Production and Water Use of Rice(Oryza sativa L.)under Water Deficit Stress during the Reproductive Stage

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概要

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• The effect of a long term of soil compaction on dry matter production(DMP) and water use in rice cultivated under limited water supply during the reproductive stage is unknown. Our objectives were to determine which of the transpiration(Tr) or water use efficiency(WUE) is dominant in determining DMP under compacted and desiccated soil conditions. When irrigation in the period around the reproductive stage was terminated in artificially compacted and non-compacted fields, the rate of suppression of DMP by soil compaction was similar in the three rice cultivars, but DMP was higher in drought resistant cultivars having deep root density at the heading stage. Six cultivars were grown in pots of 1.0 m in depth containing the soils of three levels of soil bulk density(SBD). Water supply was restricted by keeping the water table in the pot deep without irrigation during the reproductive stage. DMP and Tr in all cultivars decreased with increasing SBD, and a close relationship was seen between DMP and Tr. WUE was thus a fairly stable factor for all cultivars examined. Tr was positively correlated with root length density and was relatively maintained at a high SBD in drought-resistant cultivars having a higher root length density. We concluded that water shortage under compacted soil conditions during reproductive stage suppressed the DMP, and DMP suppression accompanied a reduction of Tr due to poor root development rather than the reduction of WUE. In the drought-resistant cultivars reduction of DMP was relatively small due to their higher developed root systems that allowed high water absorption from the deep layers in the compacted soil.

• 日本作物学会の論文

著者

• Kobata Tohru

  Department Of Agriculture Faculty Of Life And Environmental Science Shimane University

• Hoque Md.murshidul

  Department Of Agriculture Faculty Of Life And Environmental Science Shimane University

• Adachi Fumihiko

  Department of Agriculture, Faculty of Life and Environmental Science, Shimane University

• Adachi Fumihiko

  Department Of Agriculture Faculty Of Life And Environmental Science Shimane University

関連論文

• Growth Responses of Drought Resistant Rice Cultivars to Soil Compaction under Irrigated and Succeeding Non-irrigated Conditions during the Vegetative Stage
• Reduction in Leaf Water Potential and Hydraulic Conductance of Young Rice Plants (Oryza Sativa L.) Grown in Wet Compacted Soils
• Effect of Soil Compaction on the Grain Yield of Rice(Oryza sativa L.)under Water-Deficit Stress during the Reproductive Stage
• GROWTH AND YIELD RESPONSES OF THE DIRECT-SOWN DIVERSE RICE CULTIVARS TO SOIL COMPACTION STRESS UNDER THE PADDY FIELD CONDITION
• Effect of Soil Compaction on Dry Matter Production and Water Use of Rice(Oryza sativa L.)under Water Deficit Stress during the Reproductive Stage
• Effct of Hardening, Wetting and Redrying before Sowing, on Germination and Seedling Emergence of a Japanese Wheat Variety Norin 61 in Desiccated Soil
• Dose Wetting and Redrying the Seed before Sowing Improve Rice Germination and Emergence under Low Soil Moisture Conditions?

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