Identification of Nutrients Limiting Rice Growth in Soils of Northeast Thailand under Water-Limiting and Non-Limiting Conditions

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概要

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• Glasshouse nutrient omission trials are useful in identifying nurient limitations for plant growth in soils under the same environmental conditions.Soils of low fertility are commonly used for production of rainfed lowland rice(Oryza sative L.), and the crop often encounters water stress.Nutrient requirements may be modified when standing water disappears from the field.Two experiments with rice seedlings were conducted in a glasshouse at Ubon Rice Research Center, Thailand to identify the untrients which limit rice growth in soils of Northeast Thailand, and to determine whether nutrient limitations are affected by water availability.In Experiment l, rice was grown on two soils(Roi et and Ubon series)under well-watered and water-limiting conditions, and 15 nutrient treatments were imposed.In Experiment 2, six soils from Northeast Thailand were examined using the same 15 nutrient treatments.The nutrients which clearly limited the growth of rice plants in soils of Northeast Thailand were nitrogen(N)and phosphorus(P).In some cases, potassium(K)and sulfur(S)also limited growth, and in one soil zinc(Zn)and boron(B)also limited growth.A shortage of N was the most important limitation for plant growth in all soils except one in which P was more important.The low supply of P decreased plant height and leaf area development during early growth ; low N supply had a greater effect later during growth.The omission of P has a larger detrimental effect on growth when water supply was limited.In the Roi et soil, the omission of S had a large effect on leaf area and total dry matter production only under water stress conditions, but this was not found in the other soils examined.These results from glasshouse studies show that the nutrients limiting rice growth depend on soil type and water availability in soils of Northeast Thailand.

• 日本作物学会の論文

著者

• Duangjai Suriya-arunroj

  Ubon Rice Research Center

• Pax Blamey

  School Of Land And Food Sciences The University Of Queensland

• Fukai Shu

  School Of Land And Food Sciences The University Of Queensland

• Prasert Chaiyawat

  Ubon Rice Research Center

• Fukai Shu

  School of Land and Food Sciences, The University of Queensland

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)
• Plant Breeding Strategies for Rainfed Lowland Rice in Northeast Thailand

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