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2018 Vol.51, Issue 4 Preview Page

Short communication

Effects of Agro-machine Operating Period on Soil Physical Properties in Upland Fields
Hee-Rae Cho1
,
Kyung-Hwa Han1*
,
1Soil and Fertilizer Division, National Institute of Agricultural Sciences, RDA, Wanju 55365, Korea
*Corresponding Author
30 November 2018. pp. 499-509
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Abstract

The subsoil compaction by heavy agro-machine is an ongoing cumulative process and threat in sustainable agriculture, especially exchange land use. The knowledge concerning the effects of agro-machine on soil physical properties in upland is necessary in arable soil management. The purpose of this study is to assess soil physical properties by heavy agro-machine operating period in upland. The choice of target soils was based on soil series, which preferentially have larger area in Korean upland field, including ranking 1st to 29th. Investigated sites of chosen soil series were designated at mainly distributed area of them. The soil physical properties include plow pan depth, bulk density, soil hardness and saturated hydraulic conductivity. From the investigation, soils with heavy agro-machine longer than 10 years, showed higher plow pan thickness, bulk density and hardness, and shallower surface soil depth than soils with heavy agro-machine shorter than 9 yrs. The value of plow pan thickness, bulk density, hardness, and surface soil depth is 19.8 cm, 1.54 Mg m-3, 21.8 mm and 16.9 cm in front one and 15.2 cm, 1.48 Mg m-3, 19.3 mm and 18.1 cm in back one. Especially fine silty and heavy clayey upland soils had an increase of plow pan thickness and decrease of saturated hydraulic conductivity by longer use of heavy agro-machine when classified by different soil textural families and upland soil types. Therefore, periodic improvement of physical properties is needed for upland soil management in the long-term point of view.

The change in physical properties of upland soils as increase of heavy agro-machine use period.

Items Depth Years with heavy agro-machine Ratio (B/A)
<9 (A) >10 (B)
Average years 8 13 1.58
Surface soil depth (cm) 18.1 ± 2.1 a 16.9 ± 1.7 b 0.93
Plowing depth (cm) 13.5 ± 1.5 ns 13.0 ± 1.2 ns 0.96
Plow pan thickness (cm) 15.2 ± 4.2 b 19.8 ± 4.5 a 1.30
Bulk density (Mg m-3) top 1.24 ± 0.12 b 1.34 ± 0.12 a 1.08
sub 1.48 ± 0.09 b 1.54 ± 0.08 a 1.04
Porosity (%) top 53.4 ± 4.2 a 49.3 ± 4.7 b 0.93
sub 44.2 ± 3.5 a 42.0 ± 3.1 b 0.95
Hardness (mm) top 10.3 ± 2.6 b 12.7 ± 2.5 a 1.23
sub 19.3 ± 3.1 b 21.8 ± 3.0 a 1.13

Data are means±standard deviation.

Different letters in the same row indicate significant difference according to t-test (p<0.05).

Keywords
Agro-machine
Soil physical properties
Subsoil compaction
Hydraulic conductivity
Plow pan

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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 51
  • No :4
  • Pages :499-509
  • Received Date : 2018-09-28
  • Revised Date : 2018-11-05
  • Accepted Date : 2018-11-12
  • DOI :https://doi.org/10.7745/KJSSF.2018.51.4.499
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