Effects of Selected Treatments on the Production of Rice in Acid Sulfate Soils in a Simulation Study
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概要
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Effects of the application rate of basic slag (BS<SUB>10</SUB> and BS<SUB>20</SUB>: basic slag 10 and 20 t ha<SUP>-1</SUP>), aggregate size (A<SUB>20</SUB> and A<SUB>30</SUB>: aggregate sizes of soils, less than 20 and 20-30 mm) and groundwater level (GW<SUB>0</SUB>: no influence of groundwater and GW<SUB>50</SUB>: groundwater beneath 50 cm of the soil surface) treatments on the growth and yield of rice (<I>Oryza sativa</I> L.; BR-3 Mukta) cultivated in two pre-leached (leached for a week through tap water to remove excessive acidity and salinity from the soils before seedling transplantation) acid sulfate soils of Badarkhali (Salidic Sulfaquept) and Cheringa (Typic Sulfic Halaquept) series were evaluated in a simulation study. Optimum growth and yield of rice were recorded by the treatment combining A<SUB>30</SUB>GW<SUB>50</SUB>BS<SUB>20</SUB> in both the Cheringa (grain: 6.70 t ha<SUP>-1</SUP>) and Badarkhali (5.78 t ha<SUP>-1</SUP>) soils. The application of basic slag (BS<SUB>20</SUB>) was found to be the most effective among the individual treatments, followed by the BS<SUB>10</SUB>>GW<SUB>50</SUB>>A<SUB>30</SUB> treatments. The application of BS<SUB>20</SUB> increased the grain yield in combination with the GW<SUB>0</SUB> treatment by 100% for A<SUB>20</SUB>, while by 122% for A<SUB>30</SUB> in the Badarkhali soil. On the other hand, in the case of GW<SUB>50</SUB>, these increments were 138 and 246% for A<SUB>20</SUB> and A<SUB>30</SUB>, respectively, in the soils. However, the application of BS at the highest rate (BS<SUB>20</SUB>) to the Cheringa soil was not as effective as the A<SUB>20</SUB> and A<SUB>30</SUB> treatments in the Badarkhali soil. On the other hand, the same rate (BS<SUB>20</SUB>) of basic slag in combination with the GW<SUB>50</SUB> treatment increased the grain yield by 152 to 382% in the Cheringa soil compared with 138 to 246% in the Badarkhali soil. Almost similar and significant (p≤0.05) effects were observed for the other yield components of rice grown in both soil series. The effect of a larger soil aggregate size (20-30 mm) was more significant on the increase of the growth and yield of rice during the 4-month growing period of rice, regardless of treatments.
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