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Influence of Subsurface Barrier on Growth, Yield, Nutrient Uptake, and Water Requirement of Rice (Oryza sativa)¹

Growth of rice (Oryza sativa) under flooded conditions in Southeast Asia results in excessive water and N losses. This investigation was conducted to determine the effect of subsurface barriers of bitumen and concrete on yields of rice grown with 60, 90, and 120 kg/ha of N. Yields of rice grown over the subsurface barriers were significantly higher than those grown on the control. The increase in growth and yield of rice was attributed to increased uptake of N, P, and Fe rendered available due to conducive redox potential. Rice produced significantly higher yields with 90 or 120 kg/ha of N than with 60 kg/ha. Subsurface barriers reduced the water requirement drastically and increased water use efficiency.

Key Words: Nitrogen fertilization • Percolation • Nitrogen leaching

² Former Research Scholar, Soil Physicist, and Professor of Agronomy, respectively, Indian Institute of Technology, Kharagpur, India.

Received for publication October 20, 1971.