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Paper Information

Journal:   AGRICULTURAL RESEARCH   FALL 2008 , Volume 8 , Number 3; Page(s) 81 To 93.
 
Paper: 

SIMULATION OF BROMIDE LEACHING IN A SILTY CLAY LOAM SOIL UNDER DIFFERENT TILLAGE SYSTEMS

 
 
Author(s):  SHIRANI H., AFYUNI M., HAJABBASI M.A., HEMMAT A.
 
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Abstract: 

Transportation of chemicals from soil surface toward aquifers is influenced by soil properties, tillage management, leaching and the rate of transportation processes. Models substantially are useful for studying and applying management and it is possible to use them in planning special experiments on water and solute transport. The study was performed in two consecutive years. Different tillage treatments including disk harrowing + two disk harrowing as reduced tillage (15 cm plowing depth) (T1) and moldboard plowing + two disk harrowing as conventional tillage system (30 cm plowing depth) (T2) were used. The above mentioned treatments were done in a randomized complete block design with 3 replications and under corn cultivation for two years. To study bromide transport through the soil, potassium bromide with concentration of 16.67 g/l was sprayed uniformly on the soil surface. Then, bromide transport was predicted by solute transport models. The results showed that with increase of leaching, bromide mass center was moved to deeper layers and this kind of movement can be observed in T2 with more intensity. Comparison between the distributions of bromide concentration by deterministic convection-dispersion equation (DCDE) with measured data revealed that DCDE is more careful in prediction than stochastic CDE (SCDE). In T1, with increase of bromide leaching, CDE models fitted measured data poorly as well. On the opposite side, in T2, CDE models could present appropriate fitting of measured data (after 10 irrigations or 630 mm water). After second and fifth irrigation (126 and 315 mm water), the fitting of CDE models on bromide leaching in the soil under T1 was better than T2. Two-region mobile and immobile model (MIM) and stochastic regional model (SRM) did not present ideal fitting on the bromide transport in soil.

 
Keyword(s): SIMULATION, TILLAGE, BROMIDE, MASS CENTER, MODEL
 
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