Short-Term Immobilization of Fertilizer Nitrogen at the Surface of No-Till and Plowed Soils1
- Charles W. Rice and
- M. Scott Smith2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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