HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by McClung, G. Articles by Foss, J. E. Search for Related Content PubMed Articles by McClung, G. Articles by Foss, J. E. Agricola Articles by McClung, G. Articles by Foss, J. E.

Nitrification Inhibition by Nitrapyrin and Etridiazol in Soils Amended with Sewage Sludge Compost¹

ABSTRACT

Nitrification inhibitors, which have been used to reduce fertilizer N losses from soils, may have potential for use with organic soil amendments such as sewage sludge compost. Effects of two nitrification inhibitors, nitrapyrin [2-chloro-6-(trichloromethyl)pyridine] and etridiazol [5-ethoxy-3-(trichloromethyl)-1,2,4-thiadiazole] on nitrification were investigated in laboratory studies with Beltsville silt loam (Typic Fragiudult), Hagerstown silty clay loam (Typic Hapludalf), and Pocomoke loamy sand (Typic Umbraquult). The soils were amended with sewage sludge compost at rates of 0.0, 44.6, and 89.2 g/kg and incubated at 25°C, and at compost rates of 0.0 and 89.2 g/kg and incubated at 15°C. In all soil-compost combinations at either temperature, there were no significant differences between nitrapyrin and etridiazol as measured by NH₄-N or NO₃-N concentrations in the soils. At least 83% inhibition of nitrification was observed in all soil-compost combinations following 18 weeks of incuhation at 25°C with the highest inhibitor rate of 50 µg/g. After 9 weeks of incubation at 15°C, > 76% inhibition of nitrification was observed in all soil-compost combinations with the highest inhibitor rate of 10 µg/g. Generally NO₃-N production decreased with increased inhibitor concentration and with decreased compost rate.

¹ Scientific Art. no. 3209 and Contribution no. 6280 of the Maryland Agric. Exp. Stn., Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742.

² Faculty Research Assistant, Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742; Professor, Dep. of Agronomy, Univ. of Arkansas, Fayetteville, AR 72701; and Professor, Dep. of Agronomy, Univ. of Maryland and Presently Professor, Dep. of Soil Science, North Dakota State Univ., Fargo, ND 58105.

Received for publication May 19, 1982. Accepted for publication August 10, 1982.