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Nitrogen Management in No-Tillage Grain Sorghum Production

I. Rate and Time of Application

^a Dep. of Soil & Crop Sci., C4 Plant Sciences Building, Colo. State Univ., Ft. Collins, CO 80523 USA
^b Dep. of Crop & Soil Environ. Sci., Smyth Hall, Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061-0404 USA

View larger version (30K): [in a new window]   Fig. 1 Rainfall distribution during the growing period of sorghum for Virginia soils (A) Pamunkey sandy loam and Conetoe loamy sand, 1995; (B) Suffolk fine sandy loam, 1996; (C) Bojac sandy loam, 1996; (D) Appling-Cecil complex, 1996; (E) Atlee very fine silt loam, 1997; and (F) Kempsville fine loamy, 1997. Weather data for Wheeling silt loam was not available

View larger version (48K): [in a new window]   Fig. 2 Sorghum grain yield responses to side-dress N applications on different soil types in Virginia during 1995, 1996, and 1997. (A) Suffolk sandy loam is characterized as highly responsive, (B) Wheeling silt loam as moderately responsive, (C) Pamunkey sandy loam as nonresponsive, and (D) Conetoe loamy sand as negatively responsive

View larger version (36K): [in a new window]   Fig. 3 Yield response to sidedress N applications and response surface curves describing estimated relative profit due to N applications (starter-band N and sidedress N) on (A) Suffolk fine sandy loam, (B) Bojac sandy loam, (C) Appling-Cecil complex, and (D) Wheeling silt loam in Virginia in 1996