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A Method for Measuring Short-Term Nutrient Absorption by Plants: III. Nitrogen¹

ABSTRACT

Roots of intact, N-deficient oat plants proliferated rapidly in contact with both N-fertilized and unfertilized soils, and recovery in top growth of 10 to 40 mg. of N applied as (NH₄)₂SO₄ ranged from 67 to 38.5% after 7 days. Recovery by whole plants (tops + roots) ranged from 93 to 62%. During the same period, uptake from ureaform was about one-third that of the soluble sources.

No differences in uptake from NaNO₃, (NH₄)₂SO₄, and urea in 7 days were found. Since selective absorption of NO₃^- and NH₄⁺ ions by oat plants was not apparent under the experimental conditions, this crop is regarded as a suitable one for evaluating relative potential availability of N sources and factors influencing N uptake by the short-term method.

N uptake from fertilizer with time described a sigmoid curve. The moisture equivalent was approximately the soil moisture level at which maximum N uptake occurred from Hartsells fine sandy loam and Webster silty clay loam. A highly significant linear correlation (r = 0.98) was found between N content of whole plant and tops based on combined analysis of data obtained with 2 soils, 3 N sources, 3 uptake periods, and 4 levels of N.

¹ Contribution of the Soils and Fertilizer Research Branch, Division of Agricultural Relations, TVA, Wilson Dam, Ala. Presented before Div. IV, Soil Science Society of America, Aug. 5, 1958, at Lafayette, Ind.

² Agronomist, Agronomist (Branch Chief), and Analytical Chemist, respectively.

Received for publication December 6, 1958. Accepted for publication January 26, 1959.