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industries of Okinawa Prefecture, playing a major role in the economic stability of the prefecture. Sugarcane, a tall grass plant and the chief source of sugar, is grown in much of the prefecture over an area of more than 70% of the total land planted to crops. Sugarcane growers represent more than 85% of the total farming population and the sugarcane yield represents substantially 30% of the gross agricultural output. In the meantime, the prefecture provides a favorable environment for wild vegetation because of its subtropical position characterized by high precipitation, temperature amd humidity. Various weeds are growing obtrusively everywhere in the prefecture and the flora is significantly distinct from that in any other part of Japan. In the present study, a total of 233 species of weed, annual and perennial, were found in sugarcane fields investigated. Of these weeds, two large perennial species Paspalum urvillei Steud., a grass plant and Bidens pilosa L. var. radiata Scherff. a composite plant were chosen as the presumably most injurious because they occur more frequently, grow more rapidly and produce more seeds than any other species found. These weeds will hereafter be referred to as \"Paspalum\" and \"Bidens\", respectively. The former occurs in all months but January, February and March, while the latter occurs throughout the year. Their control involves considerable time, labor and cost, in addition to technical difficulties. It is most likely that if extensive infestation took place, the sugacane growers would inevitably be faced with a serious problem. The practice of using manual or mechanical techniques or herbicide theatments for the control of the weeds has certain limits in itself and development of more effective but less costly system of control, that still can reconcile with the existing conventional methods, is becoming more demanding. This study was conducted between 1981 and 1985 in major sugarcane growing districts of the prefecture and at the Experimental Farm of the Faculty of Agriculture, Ryukyu University with the objective of first investigating the weed communities in sugarcane fields, then the relation between the growth of Paspalum and Bidens and the environmental factors involved, and finally competition between these plants and the sugarcane. It was thought that the resultant data wonld lead to an effective control system taking advantage of the physiological and ecological characteristics of the weeds.","subitem_description_type":"Other"},{"subitem_description":"1. Weed community and flora The sugarcane field weed communities investigated in this study comprise 59 families, 181 genuses and 233 subspecies and 22 varieties. The most dominant of the families are the Gramineae and Compositae, followed by Cyperus mieroiria and Eupborbia helioscopia. The life form determined on a dormancy type basis consists mostly of Th (annual and perennial) and H (hemicryptophyte). In the newly planted fields, the Th ratio was highest, 67.9%, in Minamidaito Island and lowest, 49.6% in Kume Island. The H ratio was highest, 32.8%, in Kume Island and lowest, 19.8%, in Minamidaito Island. The number of the species found was largest, 158,in the northern part of Main Island Okinawa and smallest, 83,in Minamidaito Island. This difference may be associated with local soil type, soil moisture and other environmental elements, along with the techniques employed in growing the sugarcane. The number of species common to the locations investigated was 39 and the number of localized species was largest, 34,in the northern part of Main Island Okinawa, followed by Ishigaki Island with 23,Minamidaito Island with 15,Kume Island with 14,the southern part of Main Island Okinawa with 11,Miyako Island with 11,and the central part of Main Island Okinawa with 4. Species listed as the most frequent in all locations investigated are Sonchus oleraceus, Anagallis arvensis f. caerulea, Cyperus rotundus, Oxalis corymbosa, Digitaria ciliaris, Solanum ni","subitem_description_type":"Other"},{"subitem_description":"\u7d00\u8981\u8ad6\u6587","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_1522300295150":"ja","subitem_1522300316516":"\u7409\u7403\u5927\u5b66\u8fb2\u5b66\u90e8"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_1551255818386":"jpn"}]},"item_1617186783814":{"attribute_name":"Identifier","attribute_value_mlt":[{"subitem_identifier_type":"HDL","subitem_identifier_uri":"http://hdl.handle.net/20.500.12000/3915"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_1522646500366":"ISSN","subitem_1522646572813":"0370-4246"},{"subitem_1522646500366":"NCID","subitem_1522646572813":"AN00250548"}]},"item_1617186941041":{"attribute_name":"Source Title","attribute_value_mlt":[{"subitem_1522650068558":"ja","subitem_1522650091861":"\u7409\u7403\u5927\u5b66\u8fb2\u5b66\u90e8\u5b66\u8853\u5831\u544a"},{"subitem_1522650068558":"en","subitem_1522650091861":"The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueNumber":"34","bibliographicPageEnd":"185","bibliographicPageStart":"95"}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_1522305645492":"VoR","subitem_1600292170262":"http://purl.org/coar/version/c_970fb48d4fbd8a85"}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","filename":"KJ00000162290.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2002944/files/KJ00000162290.pdf"},"version_id":"f6c8683d-adbf-4bc0-8e64-4ee19996c5f4"}]},"item_title":"\u7409\u7403\u5217\u5cf6\u306b\u304a\u3051\u308b\u30b5\u30c8\u30a6\u30ad\u30d3\u7551\u306e\u96d1\u8349\u690d\u751f\u306e\u5b9f\u614b\u3068\u5f37\u5bb3\u8349\u306e\u751f\u614b\u30fb\u751f\u7406\u5b66\u7684\u7814\u7a76(\u9644\u5c5e\u8fb2\u5834)","item_type_id":"15","owner":"1","path":["1642837915518","1642838407312"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-02-14"},"publish_date":"2008-02-14","publish_status":"0","recid":"2002944","relation_version_is_last":true,"title":["\u7409\u7403\u5217\u5cf6\u306b\u304a\u3051\u308b\u30b5\u30c8\u30a6\u30ad\u30d3\u7551\u306e\u96d1\u8349\u690d\u751f\u306e\u5b9f\u614b\u3068\u5f37\u5bb3\u8349\u306e\u751f\u614b\u30fb\u751f\u7406\u5b66\u7684\u7814\u7a76(\u9644\u5c5e\u8fb2\u5834)"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-02-15T05:27:08.097712+00:00"}