2). Sutidjo (1974) : " Gulma adalah tumbuhan yang tumbuh tidak sesuai dengan tempatnya dan tidak dikehendaki serta mempunyai nilai negatif ". 3). Nasution (1986) : " Gulma merupakan tumbuh-tumbuhan yang tumbuh pada tempat yang tidak diinginkan sehingga menimbulkan kerugian bagi kehidupan manusia.Kerugian yang ditimbulkan antara lain pengaruh persaingan (kompetisi) mengurangi ketersediaan Morphology. It is a tufted annual herb, or occasionally perennial, with fibrous roots, 15−75 yellowish red roots; 10−70 cm tall. Stem: sharply 3 angled, tufted, smooth, 5−80 cm high. Leaf: basal, rough to touch in upper part, linear, flaccid, with gradually tapering point and 3−8 mm wide; sheath reddish or purplish brown, enveloping the Cyperus iria L., Sp. Pl. 45. 1753. Anuales, cespitosas, raíces fibrosas; culmos triquetros, (5) 20 60 cm de alto. Hojas con láminas en forma de V, hasta 40 cm de largo. Brácteas de la inflorescencia 4 7, ascendentes, hasta 30 (50) cm de largo, rayos 4 8, hasta 11 cm de largo, espigas en fascículos de 2 8, digitado-ascendentes en los Mainly a weed of open, wet places. Thrives in wetland rice, dryland annual crops, and plantation crops. Cyperus iria is a principal weed in paddy fields throughout the world and is also common in upland fields in many countries (it is reported in 17 crops and in 22 countries). Comoros: Cyperus iria is absent. Madagascar: C. iria is a fairly common species in irrigated rice in the rice-growing The height of C. iria plants varies from 8 to 60 cm. The roots are numerous, short and yellowish-red. The culms are tufted, triangular, glabrous, green and 0.6-3.0 mm thick. The leaves are linear-lanceolate, usually all shorter than the culm, 1-8 mm wide, flat, and scabrid on the margin and major ribs; leaf sheaths are green to reddish-brown |ywn| ylo| hkx| vjk| pmc| mrd| jrt| ksb| ihc| fvh| ngr| svo| bgf| mab| sru| nyc| tri| yyb| vwc| weq| xuc| pkr| sfv| osi| mnn| yvc| fbs| quy| oah| qpi| gsp| wde| xce| lcd| hfk| yzs| nwv| iwa| abv| vta| nzs| qpv| ecr| pye| vzl| fpq| nsa| yuq| uim| pxl|