Saturday, 15 July 2006
174-10

Physico-chemical amendments of acid sulfate soil for rice production in Bangladesh.

Md. Harunor Rashid Khan1, SM Kabir2, MMA Bhuiyan2, Hans-Peter Blume3, Tadashi Adachi1, Yoko Oki1, and K. R. Islam4. (1) Department of Environmental Management Engineering, Faculty of Environmental Science and Technology, Okayama University, Okayama, 700-8530, Japan, (2) Dept. of Soil, Water and Environment, University of Dhaka, Dhaka, 1000, Bangladesh, (3) University of Kiel, Schlieffenallee 28, Kiel, 24105, Germany, (4) Soil and Water Resources, The Ohio State University South Centers, 1864 Shyville Rd, Piketon, OH 45661-9749

Acid sulfate soils have a high agricultural potential if reclaimed by suitable amendments. The objectives of the simulated study were to evaluate the use of basic slag (10 and 20 MG/ha) and groundwater depth (0 and 50 cm below soil surface) as physico-chemical amendments of acid sulfate soils (Salidic Sulfaquept and Typic Sulfic Halaquept) for economical production of rice (Oryza sativa, L. cv. BR 3). A randomized complete block design in a 2 x 2 x 2 factorial arrangement was laid-out with 3 replications for each treatment combination. Basic slag was incorporated during soil puddling. N, P and K were applied at 100, 60 and 40 kg/ha, respectively. Thirty day-old rice seedlings were transplanted at 4 plants/hill with a 15 cm distance between hills, and were allowed to grow until harvest. Results of pre- and post amended soil analysis have shown that interactive effects of 20 MG basic slag/ha and 50 cm groundwater depth have significantly increased pH, calcium (25%), magnesium (>28%), and potassium (2%) concentration, and base-exchange capacity (53%) with an associated decreased in sodium (2%), iron (5%), and aluminum (>39%) concentration of soils over time. Soil pH increased quadratically in response to interactive effects of basic slag and groundwater depth. However, the simple effects of both basic slag (41 vs. 3%) and groundwater depth (54 and 9%) were equally consistent as their interactive effect on yield and harvest index (54 vs. 3%) of rice.

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