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Estimating Soil Mineralizable Nitrogen under Different Management Practices

^a USDA-ARS, Central Great Plains Research Station, 40335 County Rd. GG, Akron, CO 80720
^b Dep. of Agronomy, 2004 Throckmorton Plant Sciences Center, Kansas State Univ., Manhattan, KS 66506

View larger version (29K): [in a new window]   Fig. 1. Diagram showing the finite element grid for modeling water and heat movement. The line A-B represents the shelter (1/2 surface area). The dash lines represent the elements that received rainfall in the simulations. The heavy dash line indicated the runoff from the top of the shelter into the elements directly under the edge of the shelter.

View larger version (18K): [in a new window]   Fig. 2. The accuracy between measured and modeled soil temperature (for the Year 2000) under the shelter at the 0- to 5-cm depth using TRANSPOR model.

View larger version (11K): [in a new window]   Fig. 3. Measured and modeled soil water content under the shelter for 0- to 5, 5- to 15-, and 15- to 30-cm depths for the Year 2000.

View larger version (18K): [in a new window]   Fig. 4. Relationship between measured and predicted field N mineralization at 0- to 5-cm depth for 2000 vegetative stage of the growing season by manure application, mineral fertilizer application, and an unfertilized control. (Residual1) represents 10 yr of N application and 1 yr of residual N; (Residual6) represents 5 yr of N application and 6 yr of residual N.

View larger version (18K): [in a new window]   Fig. 5. Relationship between measured and predicted field N mineralization for all the treatments combination with Residual1 and Residual6 during the 2000 vegetative stage of growing season as affected by manure, NH4NO3, and 0-N control. (A) represents 0- to 5-cm depth and (B) represents 0- to 30-cm depth.