H. Takaragawa, Y. Izumikawa, Satoshi Nomakuchi, E. Taira, M. Ueno, Y. Kawamitsu
{"title":"Case Study on Varietal Mixed Planting as an Option of Variety Use in Sugarcane in Tanegashima","authors":"H. Takaragawa, Y. Izumikawa, Satoshi Nomakuchi, E. Taira, M. Ueno, Y. Kawamitsu","doi":"10.11248/JSTA.63.83","DOIUrl":"https://doi.org/10.11248/JSTA.63.83","url":null,"abstract":"","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132076216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mayumi Kikuta, Yoshinori Yamamoto, Y. B. Pasolon, F. S. Rembon, A. Miyazaki, D. Makihara
This study examined how slope-related soil physicochemical properties affect the growth and yield of upland rice subjected to slash-and-burn. The yield survey and soil analysis were performed at a hillside farm in Southeast Sulawesi Province, Indonesia. Organic-C, total-N, available-P and exchangeable-Ca, Mg, and K tended to increase further down the slope, leading to greater rice growth and yield. The resultant yield increase was mainly attributable to higher spikelet number per square meter. Total-N explained variation in spikelet number per panicle, but not variation in grain yield. Among the tested soil physicochemical parameters, only organic-C was significantly and positively correlated with rice growth and yield. In addition, most other parameters increased with soil organic-C. These findings indicate that organic-C in the soil is important to the growth and yield of upland rice cultivated with slash-and-burn systems, although other complex relationships may exist between rice productivity, the environment, and agricultural management factors. Moreover, our results imply that position on a slope affect rice growth and yield.
{"title":"Effects of Slope-related Soil Properties on Upland Rice Growth and Yield under Slash-and-burn System in South Konawe Regency, Southeast Sulawesi Province, Indonesia","authors":"Mayumi Kikuta, Yoshinori Yamamoto, Y. B. Pasolon, F. S. Rembon, A. Miyazaki, D. Makihara","doi":"10.11248/JSTA.62.60","DOIUrl":"https://doi.org/10.11248/JSTA.62.60","url":null,"abstract":"This study examined how slope-related soil physicochemical properties affect the growth and yield of upland rice subjected to slash-and-burn. The yield survey and soil analysis were performed at a hillside farm in Southeast Sulawesi Province, Indonesia. Organic-C, total-N, available-P and exchangeable-Ca, Mg, and K tended to increase further down the slope, leading to greater rice growth and yield. The resultant yield increase was mainly attributable to higher spikelet number per square meter. Total-N explained variation in spikelet number per panicle, but not variation in grain yield. Among the tested soil physicochemical parameters, only organic-C was significantly and positively correlated with rice growth and yield. In addition, most other parameters increased with soil organic-C. These findings indicate that organic-C in the soil is important to the growth and yield of upland rice cultivated with slash-and-burn systems, although other complex relationships may exist between rice productivity, the environment, and agricultural management factors. Moreover, our results imply that position on a slope affect rice growth and yield.","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130030024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Factors Influencing Recent Transformation and Future Development of Swidden Agriculture in Northern Laos","authors":"Chika Kameda, E. Nawata","doi":"10.11248/JSTA.59.101","DOIUrl":"https://doi.org/10.11248/JSTA.59.101","url":null,"abstract":"","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134112931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Line Cultivation Method for Rehabilitation of Breeder’s Seed of Rice in Madagascar","authors":"K. Arai, K. Yoshii, N. Kabaki, T. Hoshino","doi":"10.11248/JSTA.59.140","DOIUrl":"https://doi.org/10.11248/JSTA.59.140","url":null,"abstract":"","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134273825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present study provides an analysis of the comparative costs of cropping systems based on aman and boro rice varieties and shrimp in coastal Bangladesh. The research was conducted in the Shuktia village under Tala Upazila of Satkhira District. The results revealed that the comparative production cost per hectare of land was higher for both aman and boro rice (45,737 taka/ha and 54,411 taka/ha, respectively) than for shrimp (43,853 taka/ha), whereas the gross income, net income, and benefit cost ratio (BCR) were higher for shrimp culture. The shrimp-boro rice rotating cropping system was about 1.56 times superior to a purely rice-based cropping system. The introduction of shrimp-boro rice cropping systems changed the local land tenure, and brought a degree of economic freedom for the local farmers, both landlords and tenants. The paper concludes that a rotating shrimp-boro rice cropping system has exerted a positive economic impact on the livelihood of local farmers on the southwestern coast of Bangladesh, the area under study.
{"title":"Cost Analysis of the Shrimp-Based Cropping System in Coastal Bangladesh::A Village Level Study","authors":"Md. Rashedur Rahman, K. Ando, S. Takeda","doi":"10.11248/JSTA.57.77","DOIUrl":"https://doi.org/10.11248/JSTA.57.77","url":null,"abstract":"The present study provides an analysis of the comparative costs of cropping systems based on aman and boro rice varieties and shrimp in coastal Bangladesh. The research was conducted in the Shuktia village under Tala Upazila of Satkhira District. The results revealed that the comparative production cost per hectare of land was higher for both aman and boro rice (45,737 taka/ha and 54,411 taka/ha, respectively) than for shrimp (43,853 taka/ha), whereas the gross income, net income, and benefit cost ratio (BCR) were higher for shrimp culture. The shrimp-boro rice rotating cropping system was about 1.56 times superior to a purely rice-based cropping system. The introduction of shrimp-boro rice cropping systems changed the local land tenure, and brought a degree of economic freedom for the local farmers, both landlords and tenants. The paper concludes that a rotating shrimp-boro rice cropping system has exerted a positive economic impact on the livelihood of local farmers on the southwestern coast of Bangladesh, the area under study.","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134315010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Anatomical Study on Wax apple ( Syzygium samarangense ) Roots under Long-term Water-logged Conditions","authors":"A. Tuladhar, S. Ohtsuka, N. Nii","doi":"10.11248/JSTA.59.1","DOIUrl":"https://doi.org/10.11248/JSTA.59.1","url":null,"abstract":"","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133778641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Kikuno, H. Shiwachi, Y. Hasegawa, Junya Ohata, R. Asiedu
{"title":"Effects of Nitrogen Application on Off-Season Yam Cropping after Lowland Rice in a Derived Savanna Zone in Nigeria","authors":"H. Kikuno, H. Shiwachi, Y. Hasegawa, Junya Ohata, R. Asiedu","doi":"10.11248/JSTA.59.146","DOIUrl":"https://doi.org/10.11248/JSTA.59.146","url":null,"abstract":"","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115414028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Nguyen, S. Arima, T. Konishi, Y. Ogawa, X. D. Tran, S. Adaniya, Keiji Motomura
{"title":"Influence of Three Soil Types in Okinawa, Japan and N, P, K Fertilizations on Growth, Yield, and Oxypinnatanine Concentration of Hemerocallis fulva L. var. sempervirens","authors":"N. Nguyen, S. Arima, T. Konishi, Y. Ogawa, X. D. Tran, S. Adaniya, Keiji Motomura","doi":"10.11248/JSTA.60.109","DOIUrl":"https://doi.org/10.11248/JSTA.60.109","url":null,"abstract":"","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115789447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yoshinori Yamamoto, J. Limbongan, Kazuo Katayama, Tetsushi Yoshida, A. Miyazaki, J. Shoon, Pasolon Yulius Barra, Hubertus Matanubun, Rembon Fransiscus Suramas, Nicholus
{"title":"Changes in Leaf and Trunk Characteristics Related to Starch Yield with Age in Two Sago Palm Folk Varieties Grown near Jayapura, Papua, Indonesia","authors":"Yoshinori Yamamoto, J. Limbongan, Kazuo Katayama, Tetsushi Yoshida, A. Miyazaki, J. Shoon, Pasolon Yulius Barra, Hubertus Matanubun, Rembon Fransiscus Suramas, Nicholus","doi":"10.11248/JSTA.64.61","DOIUrl":"https://doi.org/10.11248/JSTA.64.61","url":null,"abstract":"","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124138645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Paul N. Naranja, M. Mwasaru, H. Koaze, Y. Kubo, N. Baba
{"title":"Utilizing Immature Macadamia Nuts in Prevention of Thermal Decomposition of Polyunsaturated Fatty Acids (PUFA): Case Study with Docosahxaenoic Acid (DHA):Case Study with Docosahexaenoic Acid (DHA)","authors":"Paul N. Naranja, M. Mwasaru, H. Koaze, Y. Kubo, N. Baba","doi":"10.11248/JSTA.54.140","DOIUrl":"https://doi.org/10.11248/JSTA.54.140","url":null,"abstract":"","PeriodicalId":118800,"journal":{"name":"Tropical agriculture and development","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124350494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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