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Effect of Terrazole on Nitrogen Transformations and Movement in Irrigated Corn¹

ABSTRACT

A field study was conducted on two sandy loam soils to determine the effect of Terrazole nitrification inhibitor (5-ethoxy-3-[trichloromethyl]-1,2,4-thiadiazole) on N movement and transformations. Sweet corn (Zea mays L.) was fertilized with (NH₄)₂SO₄ twice during the growing season for a total application of 250 kg N ha^–1. The N applied to one-half of the fertilized treatments was coated with Terrazole. Three levels of irrigation were established for each field. The treatments on Arlington (Typic Durixeralfs) sandy loam received 55.9, 69.0, and 78.1 cm infiltrated water. The Hanford (Typic Xerorthents) sandy loam treatments received 62.0, 76.7, and 88.2 cm infiltrated water. Soil samples were taken at 20, 40, 60, 80 and 90 d after planting and analyzed for NO^-₃ and NH⁺₄. Movement of N was correlated with both the presence of Terrazole and the quantity of water applied. Soil NH⁺₄ was consistently higher in Terrazole treatments, suggesting that nitrification was reduced by the Terrazole. However, there was no significant increase in tissue N concentrations or yield due to Terrazole additions. Denitrification losses in the field were found to be 64% lower due to the presence of Terrazole.

¹ Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521. Research supported by the Office of Water Research and Technology, USDI (Project B-203-CAL), under the matching grant program of Public Law 88-379, as amended by the Univ. of California Water Resources Center, and by Water Resources Center Project UCAL-WRC-W-564 and California Water Resources Control Board contract no. 9-029-500-0.

² Former Graduate Research Associate, Associate Professor of Soil Science, Professor of Soil Physics, and Staff Research Associate, respectively.

Received for publication September 27, 1985.