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Physio ecological characteristics of red rice local name salebyeo oryza sativa l. spontaneously occurring in korea and its competition with cultivated rice oryza sativa l. 1. germinative morphological and growing characteristics and dry matter productive ability of red rice



Physio ecological characteristics of red rice local name salebyeo oryza sativa l. spontaneously occurring in korea and its competition with cultivated rice oryza sativa l. 1. germinative morphological and growing characteristics and dry matter productive ability of red rice



Research Reports of the Rural Development Administration (Suweon) 31(3 RICE): 34-52



Red rice (local name "Salebyeo") has been a noxious weed plant to rice production in direct-seeded paddy field of Korean west sea-side. In this area, five varieties of red rice, "Monggeunsale," "Ssalsale," "Ginkkaragsale," "Galsaegssalsale" and "Galsaegkkaragsale" were collected in 1981. Germinative, morphological and growing characteristics, dry matter productive ability were investigated to find out basic information for establishment of effective control method of red rice at Kyonggi Provincial Rural Development Administration and Yeongnam Crops Experiment Station, Sangju Substation during 1983-1988. The results obtained were summarized as follows: Germination percentage of red rice "Monggeunsale" and "Galsaegkkaragsale" were 41 to 57% at one year after harvest. The emergence of red rice was not influenced by salinity and depth of soil. And red rice showed high emergence percentage, good development of mesocotyl and fast emergence in deep seeding. Particularly, germination percentage, elongation of plumules and radicles, and production of dry matter of red rice was higher than cultivated rice at low temperature condition. Germination percentage in submerging conditions was noticeably low compared to cultivated rice. And germination percentage of red rice was increased by removal or injury of glumes. Plant type of red rice was similar to Japonica rice type on the whole, but red rice showed vigorous tillering, long and slender culm, especially in 3rd, 4th and 5th internodes, short and narrow leaf blade and light green leaf color. Spikelets of red rice matured at about 20 days after heading. The glume color changed to yellow, black and brown, and spikelets shattered very easily in accordance with maturing. The grain length of red rice was similar to rice cultivar, but width was narrow, thickness was thin and color of brown rice was red than rice cultivar. The number of spikelets per panicle and secondary rachis-branches of red rice were fewer than those of cultivated rice. Therefore the percentage of spikelets attached to secondary rachis-branches was very low, and the spikelet density was sparse in red rice. Red rice showed tall plant height, low light transmission ratio, low panicle percentage in production structure, small leaf area index, low chlorophyll content and root activity. Crop growth rate, relative growth rate and net assimilation rate of red rice before and after heading were lower than those of cultivated rice. Photosynthetic rate of canopy was lower than that of cultivated rice because of droopy leaves. The highest photosynthetic rate was observed at 15 to 20.degree. C in red rice, however, 20 to 25.degree. C in palgongbyeo, and 25 to 30.degree. C in Taebaegbyeo. Red rice showed high cold tolerance at seedling stage and susceptible to leaf blast.

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Physio ecological characteristics of red rice local name salebyeo oryza sativa l. spontaneously occurring in korea and its competition with cultivated rice oryza sativa l. 2. competitive ability of red rice with cultivated rice. Research Reports of the Rural Development Administration (Suweon) 31(3 RICE): 53-66, 1989

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