All issues
Volume 69 (2007)
- Issue 6 Pages 1-
- Issue 5 Pages 1-
- Issue 4 Pages 1-
- Issue 3 Pages 1-
- Issue 2 Pages 1-
- Issue 1 Pages 1-
Volume 69, Issue 6
Displaying 1-14 of 14 articles from this issue
- |<
- <
- 1
- >
- >|
-
N. DOSHU2007 Volume 69 Issue 6 Pages 1-2
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSDownload PDF (3084K) -
Nobuhiro ITOKAWA2007 Volume 69 Issue 6 Pages 4-7
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSDownload PDF (8781K) -
Tomokazu YOSHIDA2007 Volume 69 Issue 6 Pages 8-10
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSDownload PDF (7323K) -
Sakae SHIBUSAWA2007 Volume 69 Issue 6 Pages 11-13
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSDownload PDF (7755K) -
Noritoshi SUMIDA2007 Volume 69 Issue 6 Pages 14-17
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSDownload PDF (8498K) -
Masaaki OMINE2007 Volume 69 Issue 6 Pages 18-20
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSDownload PDF (8491K) -
S. TSUCHIYA2007 Volume 69 Issue 6 Pages 21-22
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSDownload PDF (2838K) -
M. KOSHI2007 Volume 69 Issue 6 Pages 23-24
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSDownload PDF (4642K) -
Relationship between Strawberry Fruit Firmness and the Cell Wall Constituent PectinMasaru KASHIWAZAKI, Takeshi NAGASUE, Hidehira SOUTOME, Michihiro NAKAJ ...2007 Volume 69 Issue 6 Pages 49-56
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSThe firmness of strawberry fruit greatly affects such factors as operability, transportability and quality maintenance. In this study, as part of our search for non-destructive measurement method of strawberry fruit firmness, we investigated the relationship between fruit firmness and pectin, a constituent of plant cell walls. Fruit state was categorized according to color, e.g., unripe, half ripe, ripe, and fruit firmness was measured. Pectin fractions were then extracted and determined quantitatively for 67 fruits. The relationship between strawberry fruit firmness and content of alcohol insoluble solid (AIS) and hydrochloric acid soluble pectin (HSP) was indicated by correlation coefficients of 0.814 and 0.875 respectively. Given these results, strawberry fruit firmness appears to be strongly correlated with AIS and HSP content.View full abstractDownload PDF (1420K) -
Akira YANO, Aya FURUE, Tomoyuki MORIYAMA, Osamu IDE, Kazuo TSUCHIYA2007 Volume 69 Issue 6 Pages 57-64
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSThis study developed a greenhouse shading screen control system energized by a stand-alone power system comprising a 4.8 W amorphous silicon photovoltaic module and a battery with 28Ah capacity in a 5h rate. The shading screen was operated according to the temperature inside the greenhouse. On-site experiments were carried out between July 2004 and August 2004 in a greenhouse (6m in width×20m in length) at Fukuoka Agricultural Research Center. Throughout the experimental period, the shading screen moved 0-2 reciprocations per day (mostly 1 reciprocation per day), without outage, according to the greenhouse temperature. The capacity of the stand-alone power system was sufficient for shading screen operation and the battery capacity remained at almost the full level throughout the experimental period. At very hot moments, the greenhouse interior temperatures were suppressed by the shading screen.View full abstractDownload PDF (1174K) -
Effects of Rice Crop Residue on Drill PerformanceIsara CHAORAKAM, Masayuki KOIKE, Tomohiro TAKIGAWA, Akira YODA, Hideo ...2007 Volume 69 Issue 6 Pages 65-74
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSMinimum tillage systems can possibly reduce soil erosion, conserve soil moisture, and also minimize labor and fuel consumption. To validate the effects of rice crop residues on drill performance, several field trials of four different slot openers were carried out to evaluate their drill performance on sandy loam soil with four different levels of residue density (0, 2, 4, 6t/ha) and three levels of soil moisture content (45%, 50%, 55% d.b.). The seeding of the drill operation was done with four models including a bubble coulter, a V-shaped slot opener, a VRA-slot opener and a VRB-slot opener. Field evaluations of these slot openers have been studied comparatively with regard to their slot formations, which are affected by the residue densities and the soil hardness in the influential zone that is near the bottom of each slot. Significant interactions between the residue density, the soil moisture content and the effects of residue densities have been discussed for each slot opener. In particular, soil penetration resistance tended to increase after the operations of a bubble coulter and a V-shaped slot opener under entire combinations of residue density. In terms of prediction, no significant effects of residue densities were found in the case of a VRA-slot opener and a VRB-slot opener. These two slot openers not only acted effectively to remove the residues prior to the seeding process but also confirmed the importance of a favorable slot profile preparation for stable plant growth.View full abstractDownload PDF (7882K) -
Effects of Residue Handling on Drill PerformanceIsara CHAORAKAM, Masayuki KOIKE, Tomohiro TAKIGAWA, Akira YODA, Hideo ...2007 Volume 69 Issue 6 Pages 75-83
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSThe field performances of slot openers and residue handling devices have been studied experimentally in conjunction with the role of micro-managed surface residues which are advantageous for seeding and moisture conservation. Hairpinned residues and the area of soil disturbance were identified as the key factors in evaluating drill performance. The drill operations of four slot openers including a bubble coulter, a V-shaped, a VRA- and a VRB-slot openers were demonstrated. Regarding of hairpinned residues, a VRA- and a VRB-slot openers showed practically significant results to prevent from incorporation of hairpinned residues whereas a residue handling device acted to push the residues away from the slots. A bubble coulter and a V-shaped slot openers pressed the surface residues into the slots. A minimal area of soil disturbance occurred with a V-shaped and a VRB-slot openers. On the contrary, a bubble coulter disturbed a relatively wider area under bare soil (0t/ha) or lower level of residue density (2t/ha). A VRA-slot opener similarly disturbed a wider area under the given conditions. It can be concluded that a VRB-slot opener showed an acceptable practicability under the setting conditions. This unit could perform an ideal seedbed making actions in terms of the compressed slot, soil penetration resistance, hairpinned residues, and minimal area of soil disturbance so as to secure a higher percentage of seed germination and soil moisture conservation.View full abstractDownload PDF (11378K) -
Tadashi CHOSA, Masaaki OMINE, Daisuke MIYAMA, Eiji MORIMOTO, Yoichi SH ...2007 Volume 69 Issue 6 Pages 84-90
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSA granule applicator control system using a global positioning system (GPS) velocity sensor was developed. This sensor uses conventional single-frequency GPS to directly estimate velocities from carrier phase measurements and their derivatives by computing radial velocities between satellites and the receiver.
The developed system was tested for accuracy and applied to actual farm work. Actual application rates varied accurately with planned rates. Positioning for planned changes in application rate was accurate within 0.7m. The difference between actual and planned application rates in actual farm work was less than 10%. The system controlled by the GPS velocity sensor is now available for practical use.View full abstractDownload PDF (6479K) -
Tadashi CHOSA, Masaaki OMINE, Hisashi HOSOKAWA, Kazuhiro OTA, Masaichi ...2007 Volume 69 Issue 6 Pages 91-97
Published: November 01, 2007
Released on J-STAGE: November 17, 2011
JOURNAL FREE ACCESSWe have developed a sampling unit for use during combine harvesting to efficiently collect grain samples for later analysis of grain quality. Its suitability was investigated.
The effects of winnowing on the state of grain diffusion in the grain tank were determined by placing a collection plate with sampling cups inside the grain tank. The physiochemical characteristics of the samples that would be collected were close to the average of those of the other grains.
The influences of tailings return were determined by using the developed unit during ordinary harvesting. The collected samples were compared with samples manually harvested at the corresponding locations. The root mean square error for protein content of samples collected by the developed system was 0.35. It was suited for monitoring grain quality variability.View full abstractDownload PDF (8227K)
- |<
- <
- 1
- >
- >|