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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 3
Displaying 1-4 of 4 articles from this issue
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Kazutaka UMETSU, Hidehiko TAKAHATA, Andrew G. HASHIMOTO1995 Volume 26 Issue 3 Pages 139-144
Published: December 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA single-spindle rotational viscometer with temperature control bath was used to study effects of temperature and solids concentrations on rheological properties of dairy manure slurry having total solids concentrations (TS) ranging from 2.79 to 10.82%, shear rates (γ) ranging from 0.065 to 17.10s-1 and temperature (τ) ranging from 5.0 to 42.5°C. In this shear rate range, the power-law equation described the slurry's shear stress and shear rate relationship. Viscosity of the slurry decreased as temperature increased, and increased as TS increased. An equation to express the apparent viscosity as a function of TS and temperature was obtained.View full abstractDownload PDF (643K) -
Takami TAJIRI, Takayoshi AKINAGA, Seishi KAWASAKI, Yoshihiro KOHDA1995 Volume 26 Issue 3 Pages 145-151
Published: December 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSPineapples are types of tropical fruits that are very perishable, and it is necessary to keep it cool after harvest to maintain its freshness. Okinawan grown pineapple fruits are picked at fully matured conditions and the salable term is rather short. Tropical fruits like pineapples will develop many physiological disorders when exposed to low temperatures. Qualities of pineapples differ according to the species, growing conditions, geographical conditions, and etc. Because of these reasons, the storage temperature of Okinawan grown pineapples are uncertain.
This study was carried out to find the suitable storage temperature of pineapple fruits (summer, autumn, and winter crops).
To measure the respiration rates, pineapples were stored at 5°C to 40°C. Temperature and respiration rates were plotted to produce Arrhenius curves. After that, pineapple fruits were stored at three different temperatures to evaluate their qualities during storage.
The result showed that a low temperature storage is suitable for maintaining the quality of pineapples. In addition, the suitable storage temperature differs according to the harvest time. It was found that 5°C for summer crops, 8°C for autumn crops, and 10°C for winter crops were the best storage temperatures to keep their freshness.View full abstractDownload PDF (701K) -
Tetsuya TANABE, Takayoshi AKINAGA, Yoshihiro KOHDA, Yoshihide KOUNO, H ...1995 Volume 26 Issue 3 Pages 153-160
Published: December 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSOkinawa Prefecture is located in the southernmost part of Japan and a lot of fruits such as pineapples, mangoes, papayas and bananas are produced. Pineapple fruits on Okinawa have been mainly processed to canned pineapple. The Japanese government released the foreign trade restriction of canned pineapples and pineapple juice in accordance with GATT in April 1990, which dealt a severe blow to the Okinawan pineapple industries. Since then, the Okinawa prefectural government has been promoting productivity of fresh tropical fruits. However, as the tropical fruits are graded based on the producer's experience and intuition, the quality is uncertain. To ensure sales of high quality tropical fruits, it is necessary to employ non-destructive quality detection and sort pineapples and mangoes using Near Infrared Spectroscopy (NIR) to determine the principal sugar and acid content as essential components of quality. The results of NIR analysis suggested the possibility of predicting the sugar content in pineapples and mangoes. The sugar contents of these fruits were correlated to a specific wavelength such as near infrared absorption band of water.View full abstractDownload PDF (827K) -
On the Changes of pH, EC, and Contents of Water Soluble IonsTomoharu YAMAGUCHI, Yukuo ABE, Kazuhiko SUGIMOTO, Seiji YOKOTA1995 Volume 26 Issue 3 Pages 161-169
Published: December 25, 1995
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDegradation of soils, including salt accumulation, is one of the serious problems in agricultural production, particularly greenhouse culture for vegetables and flowers in Japan. This problem still remains as one of the major subjects in horticulture to be solved.
In this paper, we firstly analyzed some chemical components of the soils collected from three types of greenhouses with different periods of use ranging from 9 to 24 years.
The pH of shallowest layers of top-soils in the houses was 4.0 to 4.4, and the EC of the same layers ranged from 1 to 3.2mS cm-1. These are signigficant evidences to present the salt accumulation in the soils. From the analytical results with the ion chromatography, the contents of water soluble SO4-, NO3-, Cl- and Ca2+ in the greenhouse-soils tended to be higher in shallower layers, and with increasing the periods of use. The yearly increase rate of EC and ionic contents were calculated, and then, the range of production limits for greenhouse soils was estimated from the experimental results to be about 30 years.View full abstractDownload PDF (998K)
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