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• W2024498317 endingPage "1375" @default.
• W2024498317 startingPage "1366" @default.
• W2024498317 abstract "Soil organic carbon (SOC) is sensitive to management of tillage, residue (stover) harvest, and N fertilization in corn ( Zea mays L.), but little is known about associated root biomass including rhizodeposition. Natural C isotope abundance (δ 13 C) and total C content, measured in paired plots of stover harvest and return were used to estimate corn‐derived SOC (cdSOC) and the contribution of nonharvestable biomass (crown, roots, and rhizodeposits) to the SOC pool. Rhizodeposition was estimated for each treatment in a factorial of three tillage treatments (moldboard, MB; chisel, CH; and no‐till, NT), two N fertilizer rates (200 and 0 kg N ha −1 ), and two corn residue managements. Treatments influenced cdSOC across a wide range (6.8–17.8 Mg C ha −1 ). Nitrogen fertilization increased stover C by 20%, cdSOC by only 1.9 Mg C ha −1 , and increased rhizodeposition by at least 110% compared with that with no N fertilizer. Stover harvest vs. stover return reduced total source carbon (SC) by 20%, cdSOC by 35%, and total SOC. The amount of stover source carbon ( S SC) responded to tillage (MB > CH > NT), but tillage affected the amount of cdSOC differently (NT > CH > MB). Total SOC was maintained only by both N fertilization and stover return during the 13‐yr period. The ratio of SC in the nonharvestable biomass to S SC ranged from 1.01 to 3.49; a ratio of 0.6 conforms to a root‐to‐shoot ratio of 0.4 when the root biomass includes 50% rhizodeposits. Tillage controlled the fraction of SC retained as cdSOC (i.e., humified; 0.26 for NT and 0.11 for MB and CH), even though N fertilization, stover harvest, and tillage all significantly influenced SC. Decomposition of labile rhizodeposits was a major component of the nonhumified fraction. Rhizodeposition was as much as three times greater than suggested by laboratory and other controlled studies. To understand and manage the entire C cycle, roots and rhizodeposition must be included in the analysis at the field level." @default.
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• W2024498317 date "2004-07-01" @default.
• W2024498317 modified "2023-10-04" @default.
• W2024498317 title "Corn‐Residue Transformations into Root and Soil Carbon as Related to Nitrogen, Tillage, and Stover Management" @default.
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• W2024498317 doi "https://doi.org/10.2136/sssaj2004.1366" @default.
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