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Volume 26 (1995 - 199･･･
- Issue 4 Pages 187-
- Issue 3 Pages 139-
- Issue 2 Pages 81-
- Issue 1 Pages 3-
Volume 26, Issue 2
Displaying 1-5 of 5 articles from this issue
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Yoshikazu SATO, Shinji HOSHIBA, Hisashi KOWATA, Masato FUKUMOTO, Koji ...1995 Volume 26 Issue 2 Pages 81-88
Published: September 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSFactors causing muddy lots in livestock farms were investigated by field research and soil analysis. The coefficient of water permeability of the top layer in muddy paddock was rather small. The top layer of soil was tight and hard and high density part was observed. This seems to be because of kneading and tamping by cattle hooves. Organic content of top layer soil was high and plugging by organic materials seems to be one of the factors of water permeability decline. Following five items are considered to be the factors causing muddy lots: soil granulation and mixture of manure by kneading of cattle hooves, decline of water permeability, high density soil caused by tamping by cattle hooves, dehydration from soil by tamping and kneading in wet condition. Prevention of kneading on top surface of soil is considered to be effective. Underdrain may have little effects to prevent lots being muddy.
The effects to prevent muddy lots using expanded metal and plastic net settled on the top of soil were investigated. Practical experiments were performed around a bale feeder and a hey feeder, at entrances of cattle barn and pasture for about two years. Enough efficiency of these two materials to prevent muddy lots was confirmed. It was proved that the expanded metal should be galvanized to prevent rust. Since the durability of the plastic net was not sufficient, further investigations are needed to develop more durable and economical materials in the future.View full abstractDownload PDF (6879K) -
Drying of Welsh OnionKazuhiko ITOH, Chung Su HAN1995 Volume 26 Issue 2 Pages 89-96
Published: September 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe investigation was carried out to clarify the intermittent drying characteristics for welsh onion use of long-wave infrared radiation. When compared with two other methods: use of air and vacuum freezing, this method showed significantly high rate of drying.
The experiments were carried out analyzing the influence of different lengths of the welsh onion, different rate of radiation and different temperature of the airflow. The obtained results were as follows:
1. The rate of drying increases as the length of welsh onion decrease and the rate of radiation increase.
2. The airflow, temperature does not influence to the rate of drying.
3. The increasing of the drying time considerably aggravate the quality the dried welsh onion.View full abstractDownload PDF (834K) -
Possibility of Using Tensile StructuresHiromichi TOYODA, Sadanori SASE, Toshio OHTANI1995 Volume 26 Issue 2 Pages 97-103
Published: September 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThis paper attempts to investigate the possibility of adopting tensile structures to greenhouses. Such structure provides greater space with less construction materials.
The general history and progress of tensile structures for public use are described. With the exception of the air inflated double polyethylene greenhouse, the air supported greenhouse has not been widely used. However, a newly designed air supported greenhouse called “Air House” has been introduced in Japan and brought into practical use by growers. The structural and environmental performance of this greenhouse is discussed on the basis of field survey. It is indicated that insufficient ventilation causes excessive rise in temperature in sunny days. Modification and improvement will be required to ensure the favorable environments for plant growth. An air supported greenhouse in the U. S. A. is also reviewed.View full abstractDownload PDF (5033K) -
Application of Membrane Technology for Environmental Problem in Protected CultivationToshio OHTANI, Sadanori SASE, Hiromichi TOYODA1995 Volume 26 Issue 2 Pages 105-114
Published: September 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSMembrane technology has efficient separation ability of substances in a solution. A specific molecule can be separated from a solution through the ultrafiltration membrane only by pressurizing the solution. Concentration of a solute is also realized using the reverse osmosis membrane without heating. This paper is to explore a possibility of applications of the membrane technology to reduce the environmental problem caused by protected cultivation.
After a brief explanation of the membrane technology, past research and application in agriculture are summarized. It is clear that only a few investigations to apply the membrane technology to horticulture have been reported. A regulation of fertilizers and pesticides in ground water is going to start in the near future in Japan, because the increase in the concentration of pollutants in ground water is strongly concerned. In horticulture as well as agriculture, the discharge of water, fertilizers and pesticides should be restricted and they should be recycled. The authors suggest that the membrane, especially nanofiltration membrane, is one of the important technologies in order to recycle water and nutrients in hydroponics.View full abstractDownload PDF (1319K) -
Hiroyuki MUKAI, Sanki HASEGAWA, Tsukasa INADA, Mikio KAMO1995 Volume 26 Issue 2 Pages 115-120
Published: September 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA questionnaire was conducted on dairy farmers who own a freestall barn to gather information on how utilize farmer's own labor in building and maintenance of the barn.
As results, the followings were revealed. The building cost of the barns build by utilizing their own labor were about one-forth to half compared with the cost of barns build by building contractor. The farmers who build their barns using their own labor had a tendency to repair their barns by themselves and have many carpenter's tools. Damages of stall partitions due to cow forces frequently happened in freestall barns.View full abstractDownload PDF (744K)
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