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This article in AJ

  1. Vol. 73 No. 1, p. 13-17
    Received: Mar 17, 1980

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A New Look at Row and Broadcast Phosphate Recommendations for Winter Wheat1

  1. G. A. Peterson,
  2. D. H. Sander,
  3. P. H. Grabouski and
  4. M. L. Hooker



Phosphate fertilizer recommendations for winter wheat have traditionally been in terms of doubling the row applied P rate if broadcast application is to be used. A literature search failed to locate a significant amount of supportive data for this practice.

The experiments reported here were conducted to determine if there is a consistent relationship between broadcast and row applied P rates for winter wheat and if so, what that relationship is.

Six field experiments were conducted over a 2 year period on soils of, the Typic Arginstoll subgroup. Treatments were five rates of 0-46-0 (0, 11, 22, 34, 45 kg P/ha) applied as either preplant broadcast or drilled with the seed.

All experiments were on soils that responded positively to P fertilization. Results contradicted the concept of a 2:l ratio of broadcast to row P application as standard practice. The relative effectiveness of row and broadcast methods changed with changing soil tat P levels. Low soil test locations exhibited an effective ratio of about 3:l while medium soils tests had ratios of 1:l.

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