Effects of Soil Clay Content on Water Balance and Productivity in Rainfed Lowland Rice Ecosystem in Northeast Thailand(Agronomy)

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概要

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• Water availability is one of the determinants of productivity of rainfed lowland rice (Oryza saliva L.). Quantifying water losses from a paddy field, such as deep percolation and lateral seepage, assists estimation of water availability to the rice crop and development of appropriate water management in the lowlands. The main objective of this study was to evaluate paddy water availability and productivity across various soils in Northeast Thailand. The daily rate of downward water flow from standing water in the field (D) varied between 0 and 3 mm day^<-1> from clayey to sandy soils when the standing water was connected to groundwater table. However, when the standing water was separated from groundwater table, D increased up to 5 mm day^<-1> on soils with very low clay content in the topsoil. Daily net lateral water flow from the field (L) averaged over the season varied between 5 and 24 mm day^<-1> for the outflow and between 3 and 16 mm day^<-1> for the inflow. Both the inflow and outflow tended to be associated negatively with the soil clay content. The seasonal water loss through D plus L during the growing season in the lowlands was also negatively related to the soil clay content. The yield of a major rainfed lowland rice cultivar in Northeast Thailand (KDML105) varied from 2 to 4 t ha^<-1> across the region, and the water productivity (the ratio of grain yield to cumulative rainfall from transplanting/seedling establishment to maturity) ranged from 3 to 9 kg ha^<-1> mm^<-1>. High clay soils could provide good standing water until late in the growing season, so the high production efficiency was measured on such soils.

• 日本作物学会の論文

著者

• Bouman Bas

  Crop Soil And Water Sciences Division International Rice Research Institute

• Basnayake Jayampathi

  School Of Land Crop And Food Sciences The University Of Queensland

• Fukai Shu

  School Of Land Crop And Food Sciences The University Of Queensland

• Fukai Shu

  School Of Land And Food Sciences The University Of Queensland

• Harnpichitvitaya Dome

  Ubon Ratchathani Rice Research Center

• Tsubo Mitsuru

  School of Land, Crop and Food Sciences, The University of Queensland

• Tuong Phuc

  Crop, Soil and Water Sciences Division, International Rice Research Institute

• Bouman Bas

  Crop, Soil and Water Sciences Division, International Rice Research Institute

• Tsubo Mitsuru

  School Of Land Crop And Food Sciences The University Of Queensland

• Tuong Phuc

  Crop Soil And Water Sciences Division International Rice Research Institute

関連論文

• Effect of Plot Size on Accuracy of Yield Estimation of Rainfed Lowland Rice Genotypes with Different Plant Heights and Grown under Different Soil Fertility Conditions
• Molecular Breeding for Rainfed Lowland Rice in the Mekong Region(Improving the Quality of Food in Asia, Proceedings of The Fifth Asian Crop Science Conference)
• Identification of Nutrients Limiting Rice Growth in Soils of Northeast Thailand under Water-Limiting and Non-Limiting Conditions
• Effects of Soil Clay Content on Water Balance and Productivity in Rainfed Lowland Rice Ecosystem in Northeast Thailand(Agronomy)
• Estimating Percolation and Lateral Water Flow on Sloping Land in Rainfed Lowland Rice Ecosystem(Diversified Cropping Systems for Asia, Proceedings of The Fifth Asian Crop Science Conference)
• Effect of irrigation method and N-fertilizer management on rice yield, water productivity and nutrient-use efficiencies in typical lowland rice conditions in China
• Plant Breeding Strategies for Rainfed Lowland Rice in Northeast Thailand

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