Enzyme activities distinguish long-term fertilizer effects under different soil storage methods

• DOI: 10.1016/j.apsoil.2022.104518
• Publication Date: 2022-05-11T03:17:37Z
• Authors: C.L. Reardon; A.M. Klein; C.J. Melle; C.H. Hagerty; E.R. Klarer; S. Machado; T. Paulitz; L. Pritchett; D. Schlatter; S.F. Smith; S.B. Wuest
• Keywords: Soil carbon; Cycling

Long-term nitrogen fertilization imparts significant effects on the soil environment and microbial communities relevant to nutrient cycling. Understanding complex interactions between biology, management practices, is an important step toward improving health. The Crop Residue study of Long-Term Plots at Pendleton, Oregon USA demonstrate declines in quality with acidification reduced carbon under a wheat-fallow cropping system. Soil enzyme activity (β-glucosidase, β-glucosaminidase, acid alkaline phosphatase, arylsulfatase, arylamidase) ammonia oxidation was measured plots managed three different fertilizer treatments (no fertilization, urea-ammonium nitrate, manure) two stages crop growth. had strong impact total produced broad range pH from 4.8 (urea-ammonium nitrate) 5.7 fertilizer) 6.7 (manure). Overall, potential cycling (hydrolytic enzymes oxidation) enhanced manure-fertilized soils except for phosphatase which greater low soil. Treatment trends proportional geometric mean (an index capacity) were generally consistent over 32-year transect excluding phosphatase. All activities highly correlated carbon, nitrogen, sulfur. Except all also pH. only vary by phase β-glucosidase boot than tillering. Soils remaining after analyses oven-dried 40 °C stored non-climate-controlled warehouse archiving. After 2-years storage, re-assessed hydrolytic determine whether ability distinguish treatment differences retained archived soils. samples showed similar contrasts as analyzed moist manure other treatments, although level significantly reduced. long-term slowed decline acidity function organic matter dynamics