Improving organic C and N fractions in a sulfur-deficient soil with S fertilization |
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Authors: | S S Malhi |
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Institution: | 1. Agriculture and Agri-Food Canada, P.O. Box 1240, Melfort, Saskatchewan, Canada, S0E 1A0
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Abstract: | A field experiment was conducted over 9?years (1999 to 2007 growing seasons) in northeastern Saskatchewan on a S-deficient Gray Luvisol (Typic Haplocryalf) soil. The objective was to determine the relative effectiveness of N alone versus combined annual application of N (120?kg N?ha?1) and S (15?kg S?ha?1) fertilizers to a wheat–canola rotation on storage of total organic C (TOC) and N (TON) and on the light fraction organic C (LFOC) and N (LFON) in soil. Compared to N alone, annual applications of S fertilizer in spring in a combination with N resulted in an increase in soil of TOC (by 2.18?Mg C?ha?1), TON (by 0.138?Mg N?ha?1), LFOC (by 1,018?kg C?ha?1), and LFON (by 42?kg N?ha?1). The relative increases in organic C or N due to S fertilizer application were much higher for the light organic fractions (36.9% for LFOC and 27.5% for LFON) than for the total organic fractions (9.2% for TOC and 7.3% for TON). The findings demonstrate the importance of a balanced/combined application of N and S fertilizers to crops in storing more organic C and N in this S-deficient soil. |
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