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ABSTRACT
Immobilization of (NH4)2SO4 in no-till and conventionally tilled soils was monitored after application of 15N enriched material to the surface of 20-cm diameter plots on three soil types. Soils were collected periodically up to 35 d and 15N in organic and inorganic fractions was measured. On all three soils there was more immobilization in no-till. After 35 d, the percentage of fertilizer applied that was immobilized was 21 and 11 on Maury silt loam, 13 and 6 on Tilsit silt loam, and 24 and 15 on Cavode silt loam for no-till and conventional tillage, respectively. There were no consistent trends or statistically significant differences between tillage treatments with regard to total N recovery (organic plus inorganic). The increased potential for immobilization of N at the surface of no-till soils may significantly reduce crop recovery of fertilizer N.
1 Published with the approval of the Director of the Kentucky Agric. Exp. Stn. as Journal Article no. 83-3-177.
2 Former Graduate Research Assistant, and Associate Professor of Soil Microbiology, Univ. of Kentucky. Lexington, KY 40546. Current address of senior author is Dep. of Crop and Soil Sciences, Michigan State Univ.
Received for publication June 15, 1983. Accepted for publication October 17, 1983.
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