水稻品種의 出穗生態에 關한 硏究

• 영문명: Ecological Studies on Heading of Rice Varieties under Field Conditions in Korea
• 발행기관: 한국육종학회
• 저자명: M.S. LIM(林茂相)
• 간행물 정보: 『한국육종학회지』Vol.13 No.2, 1~28쪽, 전체 28쪽
• 주제분류: 농수해양 > 기타농수해양
• 파일형태: PDF
• 발행일자: 1981.08.30

영문 초록

Several investigations were undertaken with 78 rice varieties of Korean leading cultivars and some important breeding materials to clarify the nature of heading fluctuations due to the different sets of the climatic conditions with years and seasons, to estimate the heading duration from transplanting to heading under various locations and seasons in rice culture, and to classify the understandable ecotypes of the Korean rice varieties for rice breeders and agronomists in Korea. Twenty-day seedlings were transplanted in the paddy field from early May to August with 10-day intervals under the ordinary fertilization. Heading dates were recorded and analyzed with the climatic factors on the varietal bases. The results obtained are summarized as follows: 1. The standard partial regression analysis for the effect of the climatic factors affecting to the heading durations indicated that there were single and interaction effects among the various climatic factors to the heading duration. 2. The covariance analysis revealed that there were not any significant interactions among average air temperature, sunshine hours, and day length. Thus these three factors were mainly used for the multiple regression equations to estimate the growth duration of the rice cultivars in Korea. 3. The climatic index in terms of number of days, which affect the growth duration of the individual varieties, were estimated through six years. 4. The year variations of heading duration were great as well as the seasonal variations, and the degree of variations differed from variety to variety. 5. The critical temperature which did not affect the heading duration was estimated as 18.2℃. Most of the Korean rice varieties showed their shortest growth duration under the day length of 13.5~14.5 hours, which suggested that most of the Korean rice varieties were little sensitive to the photo-period while more than half of the tested varieties were affected in their heading duration by the day length at significant levels. 6. Except some inadequate Hokkaido varieties and the non-sensitive varieties, the heading durations could be estimated by the regression equations when adapted them to the individual varieties. 7. The regression equations obtained both through several years and various seasons on the varietal bases could be adapted to the areas within the latitude of 37±3°N, regardless of the years and seasons. 8. The regressions obtained from the specific year were well adapted to the year but the regressions from the long-term experiments were adapted much better to wide range of years am seasons even though there were deviations. 9. From the regression equation on the individual variety, the range of adaptable locations could be justified and the heading delay due to the irregularly fluctuated temperatures on the variety could be estimated. 10. The ecotypes can be classified into 29 groups based on their basic vegetative growth duration, relative eliminable growth duration, and significance of the photo and thermo effect to the heading duration within the range of tested varieties and climatic regulations under field conditions in Korea. In this case, only 18 groups of the ecotypes could be adopted to the 78 tested varieties.

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