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This article in SSSAJ

  1. Vol. 52 No. 4, p. 1063-1068
    Received: Aug 31, 1987

    * Corresponding author(s):
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Phosphorus Fertilizer Placement and Tillage in a Wheat-Fallow Cropping Sequence

  1. J. A. Stecker,
  2. D. H. Sander ,
  3. F. N. Anderson and
  4. G. A. Peterson
  1. Dep. of Agronomy, Univ. of Missouri, Columbia MO 65211
    Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583
    Panhandle R&E Ctr., Scottsbluff, NE 69361
    Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523



Since water and wind erosion are serious problems during fallow in most western winter wheat (Triticum aestivum L.) growing areas and available soil P is often low, field studies were conducted at three locations in western Nebraska on a Keith silt loam (fine-silty, mixed, mesic, Aridic Argiustoll). These studies compared the performance of broadcast, knife and seed placement of fertilizer P with and without a residue treatment of 13.5 Mg ha−1 in a plow, no-till, and stubble mulch tillage system. Plowing generally tended towards the highest and no-till the lowest grain yield and P uptake. Delayed maturity resulting from abnormally cool spring temperatures was believed to be a contributing factor to lower yields in no-till. Without applied residue, grain yields were increased by P placement methods in the order of seed = knife > broadcast similar to other reported research. When residue was applied, knife placement was less effective and broadcast more effective compared to seed placement at the low P rate (8.4 kg ha−1). At the high P rate (16.8 kg ha−1) seed placement produced the highest yield of all treatments. Seed placement showed higher P uptake in no-till than other tillage treatments at one location while broadcast P resulted in higher P uptake with plowing than with stubble mulch or no-till at another location. The colder soil temperatures associated with surface residues apparently favored seed placement of P. There was a trend for grain yield and P uptake to be lower when P was knifed in the presence of surface residues.

This research was supported in part by the Anna Elliott Foundation. Contribution of Nebraska Exp. Stn. Journal no. 8151.

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