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2021 Vol.54, Issue 4 Preview Page

Short communication

Estimation of Upland Soil Loss and Canopy Cover Subfactor under Soybean Cultivation Using Slope Lysimeter
Jung-hun Ok1*
,
Jeong-woo Son1
,
Seon-ah Hwang1
,
Hyub-sung Lee2
,
Bu-yeong Oh1
1Researcher, Division of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea
2Post-Master Fellow, Division of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea
*Corresponding Author
30 November 2021. pp. 651-659
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Abstract

This study was conducted to estimate the upland soil loss and canopy cover subfactor for revised universal soil loss equation (RUSLE) on different soil types using a slope lysimeter. The lysimeters were installed with 13% steepness, 25 m length, 2 m width under three different soil textures which were clay loam (CL), loam (L), and sandy loam (SL). The experiment was done for five months from 27-May to 29-October, 2020 and the soybean seedling was transplanted on 27-May and harvested on 29-October. Upland soil loss and runoff, soybean growth response, and meteorological data were monitored. Total eight times rainfall events recorded 710.5 mm precipitation, resulting in rainfall intensity (EI30) of 3,351.6 MJ mm ha-1 hr-1. Total amounts of soil loss from uncultivated and soybean cultivated soils were 31.8 and 6.9 ton ha-1 for CL, 32.3 and 16.8 ton ha-1 for L lysimeter, 61.04 and 14.4 ton ha-1 for SL, respectively. In addition, the canopy cover subfactor of RUSLE values for CL, L, and SL were 0.564, 0.507, and 0.371, respectively. The highest soil loss was measured at 18 days after soybean transplanting (DAT18), occupied 75% of total soil loss over whole experiment period.

The upland soil loss on different soil textures using slope lysimeters in 2020.
Rainfall event (DAT‡) Precipi-tation (mm) EI30 (MJ mm ha-1 hr-1) CL† (ton ha-1) L (ton ha-1) SL (ton ha-1)
Bare Soybean Soybean/Bare Bare Soybean Soybean/Bare Bare Soybean Soybean/Bare
DAT18 98.0 384.9 1.7 (±1.2) 4.9 (±0.9) 2.82 9.3 (±2.8) 12.9 (±0.5) 1.38 11.0 (±10.2) 10.9 (±1.8) 0.99
DAT41 61.0 172.0 3.8 (±0.1) 0.4 (±0.1) 0.12 5.4 (±3.8) 0.8 (±0.1) 0.15 9.7 (±10.0) 0.4 (±0.1) 0.04
DAT47 158.5 744.8 4.2 (±1.2) 0.4 (±0.1) 0.09 7.0 (±6.6) 0.9 (±0.0) 0.12 10.1 (±3.4) 0.6 (±0.1) 0.05
DAT55 41.5 213.4 5.0 (±3.2) 0.1 (±0.0) 0.02 2.9 (±3.0) 0.3 (±0.0) 0.09 5.3 (±1.4) 0.3 (±0.0) 0.05
DAT64 159.5 1,408.3 10.5 (±5.1) 0.6 (±0.5) 0.06 3.7 (±4.4) 1.1 (±0.1) 0.30 12.1 (±4.3) 0.8 (±0.2) 0.06
DAT76 61.5 145.4 3.4 (±3.2) 0.2 (±0.0) 0.05 1.1 (±0.7) 0.4 (±0.1) 0.33 3.3 (±0.4) 0.6 (±0.4) 0.18
DAT99 60.0 141.4 3.0 (±0.7) 0.1 (±0.0) 0.03 1.3 (±0.6) 0.2 (±0.1) 0.19 4.9 (±0.4) 0.6 (±0.2) 0.11
DAT103 70.5 141.4 0.1 (±0.1) 0.2 (±0.1) 1.80 1.5 (±0.6) 0.2 (±0.1) 0.11 4.9 (±2.0) 0.3 (±0.1) 0.06
Total 710.5 3,351.6 31.8 6.9 0.22 32.3 16.8 0.52 61.4 14.4 0.23

†CL, L, and SL indicated clay loam, loam, and sandy loam, respectively.

‡DAT, day after transplanting.

Keywords
Canopy cover subfactor
Slope lysimeter
Soil textures
Soybean
Upland soil loss
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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 : 54
  • No :4
  • Pages :651-659
  • Received Date : 2021-11-02
  • Revised Date : 2021-11-16
  • Accepted Date : 2021-11-16
  • DOI :https://doi.org/10.7745/KJSSF.2021.54.4.651
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