HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Kelley, K. W. Articles by Sweeney, D. W. Search for Related Content PubMed Articles by Kelley, K. W. Articles by Sweeney, D. W. Agricola Articles by Kelley, K. W. Articles by Sweeney, D. W. Related Collections Crop Rotation Systems Nitrogen Wheat

Wheat

Placement of Preplant Liquid Nitrogen and Phosphorus Fertilizer and Nitrogen Rate Affects No-Till Wheat Following Different Summer Crops

Kansas State Univ., Southeast Agric. Res. Center, P.O. Box 316, Parsons, KS 67357

^* Corresponding author (kkelley{at}oznet.ksu.edu)

Received for publication August 23, 2006. Because of improved equipment technology, many producers in the eastern Great Plains are planting winter wheat (Triticum aestivum L.) no-till (NT) into previous crop residues, but management of fertilizer N and P remains critical. This field study was conducted from 1998 through 2003 in southeastern Kansas on a Parsons silt loam soil (fine, mixed, thermic, Mollic Albaqualf). The objectives were to determine effects and interactions of previous crop [corn, Zea mays L.; grain sorghum, Sorghum bicolor (L.); and soybean, Glycine max (L.) Merr.], preplant placement method of liquid N–P fertilizer [subsurface-knife (KN), surface-band (SB), and surface-broadcast (BC)], and fertilizer N rate (22, 45, 90, and 134 kg N ha^–1) on NT winter wheat yield, yield components, and nutrient uptake in a 2-yr cropping rotation. Wheat yields averaged 3.73, 3.56, and 2.97 Mg ha^–1 following soybean, corn, and grain sorghum, respectively. However, as fertilizer N rate increased, yield differences between previous crops decreased. Grain yields also were influenced by placement of N–P fertilizer, averaging 3.68 Mg ha^–1 for KN, 3.40 Mg ha^–1 for SB, and 3.19 Mg ha^–1 for BC. Plant and grain N responses indicated that grain yield differences were primarily related to greater immobilization of both fertilizer and soil N following grain sorghum, compared with soybean and corn, and to better utilization of KN N–P than surface-applied. Fertilizing with greater N rates applied as a subsurface band, especially if following grain sorghum, may be necessary to maximize NT wheat yield potential in the eastern Great Plains.

Abbreviations: BC, surface-broadcast • KN, subsurface-knife • NT, no-till • SB, surface-band • UAN, urea-ammonium nitrate solution