Labile Carbon Testing Predicts Soil Function Responses to Management

Our study aimed to provide a scientific basis for an appropriate tillage management of wheat-maize rotation system, which is beneficial to the sustainable development of agriculture in the fluvo-aquic soil areas in China. Four tillage treatments were investigated after maize harvest, including rotary tillage with straw returning (RT), deep ploughing with straw returning (DP), subsoiling with straw returning (SS), and no tillage with straw mulching (NT). We evaluated soil organic carbon (SOC), dissolved organic carbon (DOC), permanganate oxidizable carbon (POXC), microbial biomass carbon (MBC), and particulate organic carbon (POC) in bulk soil and soil aggregates with five particle sizes (>5 mm, 5–2 mm, 2–1 mm, 1–0.25 mm, and <0.25 mm) under different tillage managements. Results showed that compared with RT treatment, NT treatment not only increased soil aggregate stability, but also enhanced SOC, DOC, and POC contents, especially those in large size macroaggregates. DP treatment also showed positive effects on soil aggregate stability and labile carbon fractions (DOC and POXC). Consequently, we suggest that no tillage or deep ploughing, rather than rotary tillage, could be better tillage management considering carbon storage. Meanwhile, we implied that mass fractal dimension (Dm) and POXC could be effective indicators of soil quality, as affected by tillage managements.

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Agricultural Management and Labile Carbon Additions Affect Soil Microbial Community Structure and Interact with Carbon and Nitrogen Cycling

Microbial Ecology ◽

10.1007/s00248-013-0225-0 ◽

2013 ◽

Vol 66 (1) ◽

pp. 158-170 ◽

Cited By ~ 70

Author(s):

Sean T. Berthrong ◽

Daniel H. Buckley ◽

Laurie E. Drinkwater

Keyword(s):

Community Structure ◽

Microbial Community ◽

Nitrogen Cycling ◽

Microbial Community Structure ◽

Soil Microbial Community ◽

Labile Carbon ◽

Soil Microbial Community Structure ◽

Carbon And Nitrogen ◽

Soil Microbial ◽

Carbon Additions

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Labile carbon and other soil quality indicators in two tillage systems during transition to organic agriculture

Renewable Agriculture and Food Systems ◽

10.1017/s1742170511000147 ◽

2011 ◽

Vol 26 (4) ◽

pp. 342-353 ◽

Cited By ~ 21

Author(s):

David Bruce Lewis ◽

Jason P. Kaye ◽

Randa Jabbour ◽

Mary E. Barbercheck

Keyword(s):

Soil Quality ◽

Cover Crops ◽

Organic Agriculture ◽

Weed Management ◽

Cover Crop ◽

Transition Period ◽

Interactive Effects ◽

Labile Carbon ◽

Initial Field ◽

Soil Attributes

AbstractWeed management is one of the primary challenges for producers transitioning from conventional to organic agriculture. Tillage and the use of cover crops are two weed control tactics available to farmers transitioning to organic management, but little is known about their interactive effects on soil quality during the transition period. We investigated the response of soils to tillage and initial cover crop during the 3-year transition to organic in a cover crop–soybean (Glycine max)–maize (Zea mays) rotation in the Mid-Atlantic region of the USA. The tillage treatment contrasted full, inversion tillage with moldboard plowing (FT) versus reduced tillage with chisel plowing (RT). The cover crop treatment contrasted annual versus mostly perennial species during the first year of the rotation. The experiment was initiated twice (Start 1 and Start 2), in consecutive years in adjacent fields. By the end of the experiment, labile carbon, electrical conductivity, pH and soil moisture were all greater under RT than under FT in both starts. Soil organic matter and several other soil attributes were greater under RT than under FT in Start 1, but not in Start 2, perhaps owing to differences between starts in initial field conditions and realized weather. Soil attributes did not differ between the two cover crop treatments. Combining our soils results with agronomic and economic analyses on these plots suggests that using RT during the organic transition can increase soil quality without compromising yield and profitability.

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