• 한국초지조사료학회지
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• 제13권2호
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• pp.78-85
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• 1993

This experiment was carried out to select for the varieties with high environmental adaptability in mountainous pastures of Taekwalyong area, and the evaluation was based on the data of varietal differences of dry matter production and yield components in Tall fescue cutting at various developmental stages in growth period of autumn. The results were summarized as follows; 1. The varieties with high number of tillers per plant(NT) showed a high dry weight of plant(DW) in all autumn cuttings. These varieties(Barce1 and Fuego) may be more adaptable to mountainous pastures of Taekwalyon area than other varieties. 2. The number of tillers per plant(NT) was significantly positive correlated with dry weight of plant (DW), but dry weight of tiller(WT) was not significantly correlated with dry weight of plant(DW) in all autumn cuttings. 3. The multiple regression equations of autumn cutting stages with mean dry weight of plant(DW) and number of tillers per plant(NT) can be used to estimate the cutting time to obtain maximum mean dry weight of plant(DW) and the highest number of tillers per plant(NT). The maximum mean dry weight of plant(DW) and the highest number of tillers per plant(NT) was estimated at the time of 21 Oct. and 26 Oct, respectively. 4. Dead leaves tended to increase greatly after the 2nd cutting(l4 Oct.) in growth period of autumn. 5. The number of tillers per plant(NT) was an important yield component before tiller density achieved equilibrium, but dry weight of tiller(WT, including dead leaves) was of most significant as a yield determinant after maximum tiller density reached in growth period of autumn.

• 한국초지조사료학회지
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• 제10권1호
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• pp.1-9
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• 1990

Tillering of orchardgrass during establishment year was considered as an important factor for ground cover and forage yield. Field experiment was conducted to examine seasonal fluctuation of tiller number in three cultivars of orchardgrass; Potomac, Hall-mark, and Sumas, after transplanting with five planting density. Also, effects of plant density and nitrogen application in cultivar, Potomac were studied on tillering, forage yield and various growth characteristics in pot experiment Tillers per plant decreased with increased density and showed seasonal variations. It increased up to July, decreased during summer months, and increased again from October. Sumas had less tillers than other cultivars, especially at high density. Tillers per unit area kept high during spring. After then, there was stady decrease through summer and remained constant without affecting by planting density. Nitrogen application increased tillers per unit area in Potomac up to 20kg/10a, but decreased its tiller production at 40kg/lOa. Maximum number of tiller was obtained in the combinations of 20kg application of nitrogen with higher density than 324 plant per square meter. Forage yield increased as nitrogen application increased, while it did not respond to plant density. Forage yield had high linear correlation between LAI, leaf number with a peak at 2800 culrns. For high forage yielding, it was suggested to obtain optimum number of tillers per unit area in early season as possible, applying of adequate amount of nitrogen with relative high density depend on cultural condition.

• 한국초지조사료학회지
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• 제11권1호
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• pp.6-11
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• 1991

Perennial ryegrass 유식물체의 가을철 생육과 1변초의 개처중 및 수량구성요소와의 관계를 검토하여 월동성을 나타낼 수 있는 형질을 션발하고 품종을 분류하고자 하였다. 1. 1 번초의 척체중은 유식물체의 개체당 경수와 유의힌 정상관을, 초세와는 유의한 부의 상관을 나타내었다. 2. 1번초의 개체중은 출수경중, 개체당경수, 영양경수, 출수경수, 1 경중 및 출수율과 유의한 정상관이 인정되었다. 3 .상대경수출현솔이 낮은 품종은 가을철에 분얼의 발생이 많으며 상대경수출현율이 높은품종은 봄철에 분얼의 발생이 많은 특성을 나다내었다. 4 .상대경수출현율당 개체중은 1번초의 개체중, 초장, 출수정중, 개체당 경수, 출수경수, 1 경중 및 출수율과 유의한 정상관을 나타내었다. 5 .상대경수출현율당 개체중에 의하여 2품종군으로 분류되었다 즉, 상대경수출현율당 개체중이 1.0 이 상의 품종에는 7 개 품종이, 1. 0 미만의 품종에는 9 개품종이 포함되었다. 6 상대경수출현율당 개체중에 의하여 분류된 품 종군에서는 수량구성요소의 차이가 인정되었다.7 .상대경수출현율당 개체중은 월동성을 나타내는 유효한 형질이라고 생각되었다.

• 한국초지조사료학회지
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• 제9권1호
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• pp.20-25
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• 1989

This experiment was carried out in order to know the decreasing causes of plant density and its relations with pasture productivity by the times of established pasture. The results were summarized as follows, 1. The yield components of dead plant can be used to estimate the changes of pasture productivity by the times of established pasture. 2 . The number of dead plants(PD) showed a quadraticalrelation with mean dry weight of dead plant $W/pl.)$ by the times of established pasture. 3. Relationship between relative number of tillers per dead plant to mean number of tillers of adjacent plants (RNT) and relative ratio of number of tillers per dead plant to number of tillers of plants in the 1st cutting (RNDT) showed highly positive significant correlation in 1 and 3 years old pasture. 4. Less than 100 of RNT were 79.5 %, 71.4 % and 100 % of dead plants in 1, 3 and 5, and 7 years old pasture, respectively. 5. Not exceeding values of RNDT to MRRNT were 89.7 %, 71.4 % and 100 % of dead plants in 1, 3 and 5, and 7 years old pasture. 6 . The values of 79.5 %, 57.2 % and 100 % of dead plants in 1, 3 and 5, and 7 years old pasture were not exceeding to MRRNT and less than 100 of RNT. 7. From the results described above, it was discussed that the relative number of tillers per dead plant(RNT) should be described not absolute deaeasing causes of plant density in 1 and 3 yars old pasture. But, the total number of dead plants in 5 and 7 years old pasture were absolutely influenced by RNT and MRRNT.

• 한국작물학회지
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• 제27권1호
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• pp.20-27
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• 1982

출수기 이후 벼의 동화산물이 분벽자간에 이동하고 있는지를 알기 위하여 1979년에는 일본형 품종 아끼바레만을 그리고 1980년에는 아끼바레와 통일계 품관인 밀양 2003의 두 품종을 공시, 출수기에 분벽자단위로 적엽 또는 적수처리의 정도를 달리하므로써 동일주내의 Source와 Sink의 크기를 조절하여 시험한 결과를 요약하면 다음과 같다. 1. 동일주내에서 적엽한 분벽자의 수가 많아질수록 적엽한 분벽자의 등숙율은 점차로 감소되었으나 완전적엽한 주의 등숙율보다는 높은 수치를 보였다. 2. 동일주내에서 적엽일적수의 비율을 달리한 처리구간에는 등숙율의 차이가 없었으나 완전적엽한 주의 등숙율보다는 높은 수치를 보였다. 3. 동일주내에서 적엽한 분벽자의 수가 많아질수록 적엽한 분벽자의 수당립중은 점차로 감소되었으나 완전적엽한 주의 수당립중보다는 많았다. 4. 동일주내에서 적엽일적수의 비율을 달리한 처리구간에는 수당립중의 차이가 없었으나 완전적엽구의 수당립중보다는 많은 값을 보였다. 5. 동일주내에서 적엽한 분벽자의 수를 달리하거나 적엽일적수한 분벽자의 비율을 달리한 결과 출수기 이후에도 동화산물이 분벽자간에 이동되는 것이 확인됐고 이와 같은 현상을 Source와 Sink의 관계로 해석할 수 있었다.

• 한국초지조사료학회지
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• 제8권2호
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• pp.77-84
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• 1988

This experiment was conducted to investigate the morphological and structual characters and the dry weight of plant (DW/pl.) concerned vegetational structure of orchardgrass pastures by the times of year, from 1 year to 7 year previous, 1986 through 1980, alternately. this experiment was carried out on the experimental fields of Yonsei University. The results are summarized as follows: 1. Population density (PD) was extremely decreased by the times of year. 2. Pasture productivity was highest at 3 year old pasture, was lowest at 5 year old pasture and was recovered at 7 year old pasture. 3. Recovery of pasture productivity was followed the increase of dry weight of plant (DW/pl.) and number of tillers per plant (NT/pl.) 4. The population density of 7 year old pasture was 14 plants per square meter. 5. The number of tillers per plant (NT/pl.), dry weight of plant (DW/pl.) plant length (PL), and plant size (PS) was frequently showed the highest values by the times of established year. 6. The stubble diameter (DIA), stubble area (SB), plant size (PS), distance between neibour plant (DIS) and leaf area index (LAI) was increased according to the times of year. 7. The dry weight of plant (DW/pl.) was positively significant correlations with the number of tillers per plant (NT/pl.) all of the established pastures, but the dry weight of a tiller (WT) was tended to increase of correlations with the dry weight of plant (DW/pl.) by the times of year. 8. Differences between morphological and structual characters was recognized according to the times of year.

• 한국초지조사료학회지
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• 제8권3호
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• pp.77-84
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• 1988

This experiment was conducted to investigate the morphological and structual characters and the dry weight of plant (DW/pl.) concerned vegetational structure of orchardgrass pastures by the times of year, from 1 year to 7 year previous, 1986 through 1980, alternately. This experiment was carried out on the experimental fields of Yonsei University. The results are summarized as follows: 1. Population density (PD) was extremely decreased by the times of year. 2. Pasture productivity was highest at 3 year old pasture, was lowest at 5 year old pasture and was recovered at 7 year old pasture. 3. Recovery of pasture productivity was followed the increase of dry weight of plant (DW/pl.) and number of tillers per plant (NT/pl.). 4. The population density of 7 year old pasture was 14 plants per square meter. 5. The number of tillers per plant (NT/pl.), dry weight of plant (DW/pl.) piant length (PL), and plant size (PS) was frequently showed the highest values by the times of established year. 6. The stubble diameter (DIA), stubble area (SB), plant size (PS), distance between neibour plant (DIS) and leaf alea index (LAI) was increased according to the times of year. 7. The dry weight of plant (DW/pl.) was positively significant correlations with the number of tillers per plant (NT/pl.) all of the established pastures, but the dry weight of a tiller (WT) was tended to increase of correlations with the dry weight of plant (DW/pl.) by the times of year. 8. Differences between morphological and structual characters was recognized according to the times of year.

• 한국작물학회지
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• 제38권2호
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• pp.103-111
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• 1993

다수확을 위한 수도 적정분벽경수의 결정과 그들의 해부형태학적 특성을 검토하기 위해 분벽력이 다른 7개 품종을 공시하여 국제미적연구소(IRRI) 온실에서 실험을 실시하였다. 1. 주당 적정분벽경수는 품종에 따라 5～9개로 주간, 1차 분벽경중 1～5번째와 2차 분벽경의 1～2번째가 포함되었으며 품종군별 다소의 차가 있었다. 2. 적정분벽경은 이앙후 분벽이 빠르고 영양생장기간이 길며 수당입수가 많고 등열율은 높았으나, 1,000입중은 일정한 경향이 없었다. 3. 적정분벽경의 영양생장기간은 출수시기와 상관이 없었으나 (운봉벼 제외) 이삭의 1차 지경수 (IR 30, Hybrid 제외), 충실입수(Hybrid 제외)과 각각 정의 상관이 인정되었다. 4. 적정분벽경은 이삭목의 유관속수가 기타 분벽경보다 많았으며 이삭목의 크기와 유관속수 간에 정의 상관관계가 있었다. 5. 이삭목의 수와 크기는 품종간 차가 현저하였으며 충실입중은 명 품종 모두 유관속수 및 크기와 정의 상관이 있었다.

• Plant Resources
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• 제4권1호
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• pp.31-35
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• 2001

Major characteristics of new Waesungri maize inbred line has multi-tiller and ears: five to six tillers and seven to eight ears per plant and flowering date of Waesungri was delayed about 18 and 24 days compared to Mo17 U.S line and IK$_4$ Korean local lines, respectively. Number of ears, fresh and dry weight per plant were significantly different among all tested hybrids including Waesungri/Sinkihong hybrid under different planting times and densities. Especially, both fresh and dry weight of IK$_1$/FR140//Waesungri F$_1$hybrid were significantly higher at high planting density. In kernel weight per unit area, Wnesungri/Sinkihong hybrid was high at high density and IK$_1$/FR140//Waesungri hybrid was high at low planting density. As results of analysis of variance, flowering date was shown a significantly different both planting times and varieties, while other characters including stem height were shown very variable in interactions with enviromental factors.

• 한국초지조사료학회지
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• 제14권3호
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• pp.195-200
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• 1994

This experiment was undertaken to study the relationship between dry weight of plant(DW) and yield components. varietal differences in seasonal production at each of three cutting. and to classiQ them into some patterns of seasonal production in tall fescue varieties. The varieties examined were Barvetia. Fuego, Demeter. Safe, Barcel. Forager, Johnstone. Enforcer and Stef. The results obtained were as follows : 1. The Fuego and Barcel with high number of tiller per plant(NT) which had more dry wieght of plant(DW) than those of varieties with low number of tillers per plant(NT) at each cutting. 2. The dry weight of plant(DW) in 1st cutting indicated positive significant correlation with the number of tillers per plant(NT) and dry weight of a tiller(WT). But there was only positive correlation between the number of tillers per plant(NT) and dry weight of plant(DW) in 2nd and 3rd cutting. 3. Mean relative yield of each cutting were 3 1 %. 29.7% and 39.3% in 1st. 2nd and 3rd cutting, respectively. 4. Tall fescue varieties could be classified into 3 different seasonal growth patterns according to their mode of relative yield at each cutting. Barvetia, Fuego, Johnstone. Enforcer and Stef belong to the group of ABA with high relative yield in 1st and 3rd cutting. Demeter, Safe and Forager belong to the group of CBA with relative yield increased linearly up to 3rd cutting. And, Barcel belong to the group of BAB with high relative yield in 2nd cutting.