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Placement of UAN for Dryland Winter Wheat in the Central High Plains

^a Southwest Research-Extension Center, Kansas State Univ., Tribune, KS 67879
^b Dep. of Agricultural Economics, Kansas State Univ., Manhattan, KS 66506
^c Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27695

View larger version (21K): [in a new window]   Fig. 1. Projected wheat yield response to fertilizer N rate and application method at two residual soil N levels. The time of application was fall and spring for injected and winter and spring for broadcast applications.

View larger version (17K): [in a new window]   Fig. 2. Estimated economic optimal fertilizer N rate for fall or spring injected and winter or spring broadcast UAN to winter wheat.

View larger version (11K): [in a new window]   Fig. 3. Apparent fertilizer N recovery by wheat as affected by UAN broadcasted (winter and spring) and injected (fall and spring), average of 13 site-years, west-central Kansas.

View larger version (9K): [in a new window]   Fig. 4. The ratio of straw production to grain yield as affected by N fertilization, average of 13 site-years, west-central Kansas.