A New Look at Row and Broadcast Phosphate Recommendations for Winter Wheat1
- G. A. Peterson,
- D. H. Sander,
- P. H. Grabouski and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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