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Volume 40 (2005)
- Issue 4 Pages 183-
- Issue 3 Pages 141-
- Issue 2 Pages 67-
- Issue 1 Pages 3-
Volume 40, Issue 4
Displaying 1-5 of 5 articles from this issue
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Hideo HASEGAWA, Tomohiro TAKIGAWA, Masayuki KOIKE, Akira YODA2005 Volume 40 Issue 4 Pages 183-189
Published: December 15, 2005
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSThis paper introduces an outline of a workstation for the agricultural autonomous vehicles. It also describes a background estimation method based on the Kalman filter for detecting an agricultural autonomous vehicle. The detecting system has been achieved in eight steps: generation of a background image and initialization, adaptation of a background image, detection of a foreground image, computation for the connected components of a region; computation for the intersection of two regions; computation for regions with the aid of shape features; transformation of the shape of a region, update of a background image. In this research, performance of the background estimation method based on the Kalman filter has been compared with that of general background subtraction in terms of accuracy, using both images captured on a sunny and cloudy day. The results showed that increasing the accuracy requires more than 10 frames per second to detect an agricultural vehicle in the above conditions.View full abstractDownload PDF (2026K) -
Hideto UENO, Takayasu SUZUKI2005 Volume 40 Issue 4 Pages 191-198
Published: December 15, 2005
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSThe herbicidal mechanism and its effect was elucidated in a paddy rice field by applying distilled spirit waste (DSW) and rice bran (RB) to flooded waters, immediately after transplantation. Release of nutrients from organic materials and their soil concentration were also investigated.
1) Application of RB (2000kg ha-1) and DSW (3000kg ha-1) significantly decreased (p=0.05) the dry weight of weeds when compared with the untreated control. Between the two most common weeds, Echinochloa crus-galli Beauv. var. oryzicola Ohwi and Scirpus juncoides Subsp., DSW application decreased the dry weight weeds, whereas RB application affected only the former.
2) Organic materials decreased the redox potential of the soil 3-19 days after application, suggesting a deficiency of dissolved oxygen (essential for weed growth) in soil.
3) Anaerobic fermentation of organic material by soil microorganisms resulted in production of isobutyric acid in flooded water. A sharp concentration peak of isobutyrate was observed 7 days postapplication. A high negative correlation (r2=0.808, p=0.0024) was observed between the integrated concentration of isobutyrate and the dry weight of weeds. Production of the organic acid was considered as an important factor in the herbicidal mechanism.
4) After amendment with organic materials, the electrical conductivity of soil sharply increased, indicating the release of a large amount of water-soluble substances. Furthermore, application of organic materials markedly increased the soil concentration of ammonia, potassium, calcium, and magnesium. The usefulness of DSW and RB as nutrient amendment can be confirmed 20 days after application.View full abstractDownload PDF (1055K) -
Teruaki NANSEKI, Shusuke MATSUSHITA2005 Volume 40 Issue 4 Pages 199-204
Published: December 15, 2005
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSDownload PDF (1797K) -
Juro MIYASAKA, Katsuaki OHDOI2005 Volume 40 Issue 4 Pages 205-209
Published: December 15, 2005
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSDownload PDF (517K) -
Masamichi DAIKOKU2005 Volume 40 Issue 4 Pages 210-214
Published: December 15, 2005
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSDownload PDF (1110K)
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