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Volume 32, Issue 4
Displaying 1-14 of 14 articles from this issue
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Tawatchai CHAITRAKULSUB, Pinich CHAIDATE, Hiroshi GEMMA1988 Volume 32 Issue 4 Pages 201-207
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSFruit development of the litchi var. Hong-Huay was studied in Chiang Mai, Thailand, from February to May 1981. The development of fruits sampled during the 12 week period of growth was represented by single sigmoid curve. Fruit width, fresh weight and dry weight and volume of fruit increased slowly from the fruit set to the 4th week after fruit set, then the values of these parameters increased rapidly until the 9th week, and remained stable until maturity. Peel weight increased slowly from the fruit set to the 2nd week, and rapidly till the 8th week, and thereafter it remained rather constant until maturity.
Fruit pulp measured in the 3rd week after fruit set increased rapidly from the 5th to the 10th week and thereafter it increased slowly until maturity. Seed width and seed weight increased from the fruit set to the 3rd week, thereafter they increased rapidly until the 6th week, and remained constant. Seed length increased rapidly from the 1st to the 6th week, and thereafter it remained stable until maturity. Total soluble solids could be measured in the 6th week and the content increased rapidly until the 9th week, and then remained stable until maturity.
The content of titratable acids which could be measured in the 7th week after fruit set decreased until maturity.View full abstractDownload PDF (801K) -
Gwi Gun PARK, Isao KUSAKABE, Tsuneo YASUI, Kazuo MURAKAMI1988 Volume 32 Issue 4 Pages 208-214
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSThis paper concerns the preparation method of β-1, 4-mannotriose, that is, the process combining the enzymatic hydrolysis of brown copra meal and the subsequent elimination of mono-and di-saccharides from the resultant hydrolysate with a yeast.
The copra meal, 480g containing 151g of mannan, was hydrolyzed at 55°C and pH5 for 1 hr with the crude enzyme solution (4800ml, total mannanase activity; 627 units) from Penicillium purpurogenum No.618. The hydrolysate containing 83.7g (as total sugar) of monosaccharides, mannobiose, mannotriose and trace amounts of other oligosaccharides. Candida guilliermondii was aerobically grown in the hydrolysate supplemented with nutrients, to eliminate the monosaccharides and mannobiose from the hydrolysate without any loss of mannotriose. After cultures for 36 hr, the yeast cells were removed by centrifugation, and the supernatant liquid containing 25.4g as total sugar was decolorized with active carbon, followed by desalting on columns of cation and anion exchange resins. After concentration of the clear sugar solution, 23.1 g of mannotriose was obtained.View full abstractDownload PDF (4061K) -
Kunio KAGAWA, Hirotoshi SUGANUMA, Takao UEDA, Toyoaki MORISHITA1988 Volume 32 Issue 4 Pages 215-222
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESS -
1. Effect of method and frequency of Cutting on the yield and survival of A. marinaMasao HOSHINO, Takeshi SHINJO, Kazuhiro SATO1988 Volume 32 Issue 4 Pages 223-227
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSThe purpose of this paper is to report the results of experiment conducted to understand the effect of cutting method and frequency on the yield and survival of A. marina which is one of constituent of mangrove forests.
Three experiments were conducted in the year of 1986 and 1987. The summary of experiments are as follows:
1. A. marina is not tolerant to frequent defoliations. All plants died when plants were cut 3 to 4 times in a year. When plants were harvested once or twice in a year, if all leaves were removed, some of plants were dead. As regrowth of A. marina after cutting is not so vigorous, it seems recommendable to use biomass of A. marina rather than regrowth.
2. When plants were cut at the old stems, some of plants were died, and even survived, plant vigor were weakened seriously. When plants were harvested horizontally a half of plants, or leaves of above half of plants were harvested, all plants were survived, suggesting that this partial harvest is the safty way of utilization and conservation of A. marina.
3. All plants were survived after harvesting of 3 to 4 times in a year, when leaves above half of plants or horizontally a half of plants were harvested.
Dry matter yield per unit area are the highest at plot harvested twice in a year. As cutting frequencies were increased, the total yield in a year were decreased sharply.
From results of these experiments conducted two years, it is concluded that the efficient and safty method of utilization of A. marina seems to be partial defoliation with less frequent cuttings. The method removes all of leaves instantly causes death of individual plant and distruction of the vegetation of A. marina.View full abstractDownload PDF (611K) -
1. Land use and cropping systemShohei HIROSE1988 Volume 32 Issue 4 Pages 228-241
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSFive areas in the Embu District of Kenya, which include various climate and soil condition within a relatively short distance, were selected in order to understand the traditional farming way adapted to the social and natural environment.
The amounts of mean land holding and cropped land decreased as the altitude of the land rise. The land holding was large in the lower areas because of bushland for livestock grazing. The process from rotational bush fallow system to semi-permanent or permanent farming system seemed to be taking place in the study areas because the fallow land amounted to 10 to 20 percentage of the cropped land in the study areas. The crops grown in each area were selected to cope with the degree of dryness or wetness.
The humid savanna farming system in combination with the cereals and root crops, which originated in the American continent, and the dry savanna farming system in combination with the cereals and legumes, which originated in Africa, were predominant in the humid upper areas and in the dry lower ones, respectively.
The intercropping was common in the study areas, but the crop association was more diversified in the lower areas than the upper ones. It is supposed that the diversification of crop association is closely related to an irregular change of the environment year by year.View full abstractDownload PDF (1356K) -
Hiroyuki WATANABE, Ken-ichi ABE, Fu Qi HAO1988 Volume 32 Issue 4 Pages 242-244
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
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Data Handling and Management System for Relevant Informations on Tropical Crops, Microbes, and Soils1. With special reference to the system construction and its useHideo IMAI1988 Volume 32 Issue 4 Pages 245-253
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSSimple and rapid systems of handling and management for relevant informations on tropical crops, microbes and soils were developed.
The system combines four sophisticated programs which run on IBM PC-XT, or AT in one package, and do such four different types of work as: 1) Data entry and data edit, 2) Drawing graphs, 3) Statistical analysis, 4) Database management. Data entered in Symphony's spreadsheet are transferred to dBASE III, for further editing and modification of the data and/or changing the data file structure and then, to Statgraphics and BMDP for graph drawing and statistical analysis, respectively. The data can be moved back and forth freely between the four programs.
This system proves to be superior to other integrated programs presently available in its simplicity, rapidity, flexibility, expansivity and excellent statistical analysis, and meets most of agricultural scientist's needs.View full abstractDownload PDF (937K) -
Henrique Toshio KITAHARA1988 Volume 32 Issue 4 Pages 254-257
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
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[in Japanese]1988 Volume 32 Issue 4 Pages 258-262
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
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[in Japanese]1988 Volume 32 Issue 4 Pages 262-266
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (653K) -
[in Japanese]1988 Volume 32 Issue 4 Pages 266-268
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (381K) -
[in Japanese], [in Japanese]1988 Volume 32 Issue 4 Pages 268-274
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (2723K) -
[in Japanese]1988 Volume 32 Issue 4 Pages 274-278
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (864K) -
1988 Volume 32 Issue 4 Pages 278-284
Published: December 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (870K)
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