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Agronomy Journal Abstract -

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


This article in AJ

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

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  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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