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| Publication Type:
| Refereed |
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| Author(s): | Shibuya, Yukinori;
Segawa, Takashi;
Tamaki, Katsuhiko;
Tanaka, Koichi |
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| Author Affiliation: | Alpine Region Branch, National Grassland Research Institute, Miyota, Nagano, 389-02 Japan; Department of Grazing Animal Production, National Grassland Research Institute, Nishinasuno Tochigi, 329-27 Japan |
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| Translated Title: | Studies on measurement of penetration resistance in sloped meadows: I. Test of penetration resistance of measuring instrument with horizontal positioning device |
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| Source: | Bulletin of the National Grassland Research Institute. Vol. 50, March 1994, p. 43-52. |
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| Publishing Information: | Nishinasuno, Tochigi, Japan |
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| # of Pages: | 10 |
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| Keywords: | TIC Keywords: Physical properties of soil; Impervious soil layer; Soil penetrability; Penetrometers; Compaction
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| Abstract/Contents: | "In meadows, agricultural vehicles run repeatedly for the application of fertilizers or harvest. Soil compaction associated with these operations adversely affects grass production. The authors developed an instrument that enables to measure the penetration resistance easily and accurately to evaluate the extent of soil compaction generated by the traffic of vehicles in the meadows. The instrument is composed of a cone as penetrating part, a part for measuring the penetration resistance, a part for measuring the penetration depth, a part for recording data, a part for horizontal positioning, and a hanging part. It was posible for the cone to penetrate the soil with a constant speed through the motor of the penetrating part, and to penetrate vertically even a sloped land by using the part for horizontal positioning. To sum up, the use of this instrument enabled to measure the penetration resistance accurately. Thereafter, the instrument was used to measure the penetration resistance in several meadows. Four wheel tractors, etc. moves among the the measured points in the field. Penetrating part consisted of a cone with an apex angle of 30 degrees and a base area of 2.0 cm2. Penetration rate was 1cm/sec, with a depth of 45 cm. The instrument worked as designed. The data was all recorded without any problems. Measurement area was limited to the area where vehicles moved, namely the inclination of the area for measurement was less than about 25 degrees. The average time required for one measurement was about 5 minutes, in total. Namely 1.5 minutes in addition to the time required for movement or adjustment of the instrument and sounding of the measured point. This instrument enabled to measure penetration resistance easily and frequently. The use of this instrument, enabled to draw a contour line map of the penetration resistance to determine the position or spread of the hard pan." |
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| Language: | Japanese |
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| References: | 8 |
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| Note: | Line drawings
Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Shibuya, Y., T. Segawa, K. Tamaki, and K. Tanaka. 1994. (In Japanese) Bull. Natl. Grassl. Res. Inst. 50:p. 43-52. |
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MSU catalog number: SB 193 .A1 S6 |
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