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Effect of Placement on the Absorption of Rb⁸⁶ and P³² from Soil by Corn Roots¹

ABSTRACT

Placement of Rb⁸⁶ and P³² in the soil affected their relative uptake by corn roots. Autoradiographic techniques were used to determine the uptake processes involved. Banding of the fertilizer rather than mixing with the soil affected Rb⁸⁶ uptake more than P³² uptake. The diffusion rate for Rb⁸⁶ in the soil was much larger than for P³². Also, Rb⁸⁶ was translocated more extensively throughout the corn root than was P³².

The greater uptake of Rb⁸⁶ from band applications appeared to be due to both a greater facility for uptake by a small portion of the root and a greater diffusion of Rb⁸⁶ out of the band.

¹ Journal Paper No. 1884, Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution from the Department of Agronomy. Presented before Div. IV, Soil Science Society of America, Nov. 28, 1961 at St. Louis, Mo.

² Graduate Assistant and Professor of Agronomy, respectively, Purdue University.

Received for publication February 26, 1962. Accepted for publication October 31, 1962.