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The Availability of Fertilizer Nitrogen Immobilized During Decomposition of Straw¹

ABSTRACT

A greenhouse study measured the extent to which fertilizer N¹⁵ immobilized during decomposition of straw becomes available for plants. Less than one-half of the immobilized fertilizer N¹⁵ was released for plant uptake during four successive croppings in the greenhouse. The crops were beets, barley, and two of corn.

Fractionation of the soil N showed that about 75% of the N taken up by the plants was derived from the nondistillable acid-soluble N fraction. Fertilizer N¹⁵ immobilized in this fraction was utilized at a faster rate by plants than the N initially present in this fraction.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, and the Department of Agronomy, Colorado State University, Ft. Collins, Scientific Journal Series No. 798. Part of dissertation submitted in partial fulfillment of the requirements for the Ph.D. degree by the senior author.

² Soil Scientist, USDA; Professor of Soils, Colorado State University; and Soil Scientist, USDA, Fort Collins, Colo., respectively.

Received for publication December 3, 1962. Accepted for publication February 19, 1963.