Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (1): 26-33.doi: 10.3864/j.issn.0578-1752.2012.01.004

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Soil Macro-structure and Precision Tillage

 DING  Qi-Shuo, DING  Wei-Min, PAN  Gen-Xing, JI  Chang-Ying   

  1. 1.南京农业大学工学院/江苏省智能化农业装备重点实验室，南京 210031
    2.南京农业大学农业资源与生态环境研究所，南京 210095
  • Received:2011-06-28 Online:2012-01-01 Published:2011-09-15

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Abstract: Soil macro-structure, an extrapolation from soil structure, is 1-2 magnitudes higher in scale than soil aggregates and  more spatially and temporally dynamic in nature. Soil physical composition, mechanical indices, mechanical governing mechanisms and potential mechanical applications in agricultural production comprised the key focus of soil macro-structure study, formulated a theoretical basis for precision tillage research. Indices for soil macro-structure quantification are comprised of shear strength, cone index, plate sinkage and fracture strength, which are governed by elasto-plastic, fracture and fragmentation, and rheological mechanics of soil macro-structural dynamics. Precision tillage is the effort of testing, evaluating and modeling the soil macro-structure. This quantification of the relationship between soil macro-structure dynamics and the mode and magnitude of the externally applied mechanical forces will finally lead to technical breakthroughs for precise placement or management of soil structure, crop residue, seed, water and fertilizer. The result of which will facilitate upgrading soil workability, enhancing soil structural stability, improving trafficability and soil bearing capacity, and optimizing soil-plant-environment or terra-machinery systems.

Key words: soilmacro-structure, precisiontillage, assessment, cropresponse

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