Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 March 1956
Published in Agron J 48:106-111 (1956)
© 1956 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Availability of Phosphate Carriers to Small Grains and Subsequent Clover in Relation To: I. Nature of Soil and Method of Placement1

R. A. Olson, A. F. Dreier, G. W. Lowrey and A. D. Flowerday2

Synopsis: Comparative effectiveness of phosphate carriers as shown in yield and uptake with small grains was found to be as follows: ammonium phosphate =< concentrated superphosphate =< ordinary and ammoniated superphosphate, metaphosphate and high water solubility nitric phosphate > Rhenanian, low water solubility nitric and fused tricalcium phosphates > rock phosphate. Fertilizer nitrogen and effective placement were prime factors in promoting efficient utilization of phosphorus carriers. Phosphate availability to clover following oats was similar irrespective of carrier and placement method.

1 Contribution from the Dept, of Agronomy, Nebraska Agr. Exp. Sta. Approved by the Director as Paper No. 738, Journal Series. Grateful acknowledgment is made to the Olin Mathieson Chemical Corp. for a grant-in-aid supporting this work, to the Tennessee Valley Authority for supplying some of the materials, and to the Div. of Fertilizers and Lime, S.W.C.R.B., U.S.D.A., for supplying P32 tagged fertilizer materials.

2 Associate Professor, Assistant Agronomist, and Assistants in Agronomy respectively.

Received for publication October 22, 1955.




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Journal of Natural Resources
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Copyright © 1956 by the American Society of Agronomy.