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Utilization of Soil and Fertilizer N by Oats in Relation to the Available N Status of Soils¹

ABSTRACT

Effects of rates of NaN¹⁵ O₃ on the amounts of N derived by plants from soil and fertilizer in relation to the N and organic matter status of soils were determined. The 12 soils ranged more than fourfold in relative capacity to supply N to the crops. A values, with few exceptions, were independent of N level applied and were highly correlated with dry matter yields (r = 0.939) and total N uptake (r = 0.981) from zero-N pots. The uptake of soil N increased with level of N applied. This was attributed primarily to reactions involving rhizosphere microorganisms.

¹ Contribution from the U. S. Soils Laboratory, Soil and Water Conservation Res. Div., ARS, USDA, Beltsville, Maryland.

² Research Soil Scientists.

Received for publication July 25, 1966. Accepted for publication November 11, 1966.