Short-term effects of tillage practices on soil organic carbon turnover assessed by δ13C abundance in particle-size fractions of black soils from northeast China.

ScientificWorldJournal · 2014 · PMC4138936 · PMID 25162052

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an increasing trendno p-value reported

Under NT and MP treatments, silt plus clay OC and clay OC in the plough layers both showed an increasing trend over the five-year period (Figures 2(a) and 2(b) ).

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