• 한국작물학회지
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• 제51권2호
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• pp.163-168
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• 2006

Improvement of crop yield can be achieved through understanding genetic variation in reproductive characters and its impact on yield components. The present study was performed to evaluate genetic diversity for reproductive growth characters in exotic germplasm resources and to determine the relationships between developmental and growth periods with yield and yield components in soybean cultivar groups. For phenotypic evaluation such as reproductive and agronomic traits, a total of 80 indigenous and exotic soybean cultivars collected from four different geographical regions (China, Japan, Korea, and Vietnam) were grown from May to November of 2003 at the Seoul National University Farm, Suwon, Korea ($127^{\circ}02'E$ longitude, $37^{\circ}26'N$ latitude). Most of all the characters exhibited wide range of phenotypic variation, of which pod number, seed number, and plant yield showed greater range as compared to other characters. Korean cultivar groups showed greater diversity than the other cultivar groups in seven characters. Correlation analysis showed that days to flowering (DTF) and days to maturity (DTM) had close association with agronomic traits as well as yield and yield components. Both DTF and DTM had positive correlation with the other characters except one hundred seed weight. Stepwise multiple linear regression revealed that seed and pod number were identified as being significant for plant yield. The results in this study indicated wide variation in agronomic traits including DTF and DTM, suggesting the valuable genetic resources in a soybean breeding program.

• 한국작물학회지
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• 제50권2호
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• pp.112-119
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• 2005

The effects of Rhizobium inoculant, nitrogen, phosphorus, and molybdenum on nodulation, dry matter production, yield attributes, pod and seed yields, protein and phosphorus contents in seed of pea (pisum sativum) var. IPSA Motorshuti-3 were assessed by a field experiment. Among the treatments Rhizobium inoculant in combination with 25kg P and 1.5kg Mo/ha performed best in recording number of nodules/plant, total dry matter yield, number of pods/plant, number of seeds/pod, 1000-seed weight, green pod yield, green and mature seed yields of pea. The highest green pod yield of 15.37 t/ha ($97.05\%$ increase over control) and green seed yield of 9.6t/ha ($69.31\%$ increase over control) were obtained by inoculating pea with Rhizobium inoculant in association with 25kg P and 1.5 Mo/ha. The effects of 60 or 120kg N/ha were comparable to Rhizobium inoculant in most cases. There were positive correlations among yield attributes, yield, protein and phosphorus contents in seeds of pea. From the viewpoint of yield attributes, yield, and seed quality, application of Rhizobium inoculant along with 25kg P and 1.5kg Mo/ha was considered to be the balanced combination of nutrients for achieving the maximum output from cultivation of pea in Shallow-Red Brown Terrace Soil of Bangladesh.

• Plant Resources
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• 제5권2호
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• pp.118-123
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• 2002

In order to obtain the genetic information on the quantitative characters of black seeded soybeans, which would be needed to improve selection efficiency for breeding high yielding genotype, 45 varieties of black seeded soybeans collected in Chonnam, Korea were grown and variations of several important characters were observed. Heritability of each observed character, phenotypic and genotypic correlations among the characters and contribution of each yield component on grain yield through path coefficient analysis were estimated. Both number of pods per plant and 100-seed weight showed not only high heritability but also highly significant phenotypic and genotypic correlation with seed yield, and hence it was desirable to select plants with more number of pods per plant and higher 100-seed weight than raise seed yield of black seeded soybeans collected in Chonnam. In addition, number of pods per and 100-seed weight were proved to be the most influential variables on the viability of seed yield by path coefficient analysis. Since these showed the high heritability of number of pods per plant, selection of plants with higher 100-seed weight would be more efficient for breeding high yielding genotype.

• 한국작물학회지
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• 제51권6호
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• pp.527-533
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• 2006

The response of chickpea (Cicer arietinum L.) to dual inoculation with Rhizobium (R) and arbuscular mycorrhiza (AM), nitrogen (N) and phosphorus (P) was studied on spore abundance and colonization of AM, nodulation, growth, yield attributes and yield. In all the parameters of the crop the performance of Rhizobium inoculant alone was superior to control. Dual inoculation with Rhizobium and AM in presence of P performed the best in recording number of spore $100g^{-1}$ rhizosphere soil and root colonization, number and dry weight of nodule, dry weights of shoot and root, number of pod $plant^{-1}$, number of seed $pod^{-1}$, seed and stover yields of chickpea. The maximum seed yield of 3.33 g $plant^{-1}$ was obtained by inoculating chickpea plants with Rhizobium and AM in association with P. From the view point of nodulation, growth, yield attributes and yield of chickpea, dual inoculation with Rhizobium and AM along with P was considered to be the balanced combination of nutrients for achieving the highest output from cultivation of chickpea in Shallow Red Brown Terrace Soil of Bangladesh.

• 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.

• 한국응용곤충학회지
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• 제18권3호
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• pp.133-136
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• 1979

벼이삭 선충의 피해를 구명코저 접종시험을 실시하였다. 1. 선충의 기생은 벼의 생육 특히 분얼수에 많은 영향을 주었다. 2. 피해경율은 온도 상승과 더불어 증가하여 출수후에는 약 3배로 늘었다. 3. 생육 및 수량에 영향을 줄 수 있는 피해경율은 $13\%$이상이다. 즉 피해발현 초기에 $5\%$이하일 때는 생육과 수량에 영향이 없었고 $13\%$일때 $19\%,\;21\%$이면 $22\%$의 감수를 초래하였다. 4. 수량구성요소별로는 1000립중 립수 수수의 순으로 영향을 받았다.

• 한국작물학회지
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• 제18권
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• pp.54-87
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• 1975

수도 수량구성요소에 미치는 몇가지 기상요인의 기여율과 수량 구성요소의 지역내 년차 변이 및 년차내 지역 변이를 검토하여 수도 재배법 개선 및 작황 예측의 참고 자료를 얻고서 1966년부터 1973년까지 8개년간 3개 작물시험장 및 각 도 농촌진흥원포장에서 실시한 수도 작황 시험성적을 재료로 하여 표준 편회귀분석법을 적용 분석한 결과를 요약하면 다음과 같다. 1. 수도 수량에 미치는 수량 구성요소의 기여율은 보통기 재배에서는 수수가 가장 크고, 적파 만식재배 및 북부 지방에서의 보통기재배에서는 등숙비율이 가장 크게 나타났다. 2. 수량 구성요소의 년차 기여율은 수수가 가장 크고, 해에 따라서는 등숙비율과 현미 1,000립중이 컸으며 통일은 단위 면적당 경화수가 수량성립에 크게 영향하였다. 3. 수량 구성요소의 기여율을 적용하여 지역별 수량성립 유형을 1) 영양생장 의존형(V), 2) 편영양생장 의존형(P.V), 3) 중간형(M), 4) 편등숙 의존형 (P.R) 5) 등숙 의존형(R)으로 분류하였다. 대체로 남부지방에서는 단위 면적당 경화수 의존도가 크고 중북부에서는 등숙요소의 의존도가 컸다. 4. 수량에 대한 수량구성 4요소의 회귀식을 상승적인 식에서 대수변환하여 가산적인 식으로 작성하였던바 보통기 재배나 적파 만식재배에서 다같이 가산적인 식으로 계산하였을 때 정도높은 수량측정을 할 수 있었다. 5. 분약 각기의 경수와 수수와의 관계는 보통기재배에서나 만식 재배에서 이앙후 20일부터 유의적인 정의 상관을 인정할 수 있었다. 6. 수수는 이앙후 21∼30일의 기상요인과 가장 밀접한 관계가 있었다. 7. 각기상 요인들의 최고분약수에 미치는 기여율은 이앙후 31∼40일의 평균기온의 기여율이 가장 크고 일조시간의 기여율은 11∼30일의 컸으며 수온의 기영율은 대체로 적었다. 8. 수수의 조기 측정은 경수만의 단요인이나 기상 요인만을 조합한 것보다는 이앙후 20일경수와 이앙후 20∼40일의 최고기온, 기온교차 및 일조시간 등 복합 요인을 조합하므로서 정도 높은 추정식을 작성할 수 있었다. 9. 수당 경화수와 기상 요인과는 출수전 25∼34일에 가장 밀접한 관계가 있었는데 중북부에서는 최고기온과 일조시간의 기여율이 컸고, 남부에서는 최저기온과 일조시간의 기여율이 컸으며 최저기온은 부치를 나타냈다. 10. 각 기상 요인들의 등숙비율에 미치는 기여율은 최고기온이 가장 크고 최저기온은 출수전이나 등숙 초기에 부치를 나타냈다. 11. 현미 1,000립중에 미치는 기상요인의 기여율은 최고기온이 등숙초기나 중기에 높고 최저기온은 등숙기간에 대체로 부치를 나타냈다.

• 한국식품과학회지
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• 제32권4호
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• pp.974-978
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• 2000

다섯 종류의 시판 고추장에 대한 항복응력은 vane 방법에 의해 controlled shear-rate 조건에서 측정되었다. Vane 항복응력은 전단속도와 전단응력 데이터의 외삽법(extrapolation)에 의해 결정된 Casson 항복응력 보다 높은 수치를 보여주었다. 고추장의 구조가 손상되지 않은 시료와 이미 손상된 시료에 대해 vane 방법에 의해 정적항복응력$({\sigma}_s)$과 동적항복음력$({\sigma}_d)$이 각각 측정되었으며 큰 수치 차이로부터 고추장에 대한 구조파괴 정도를 결정하는 데 있어 vane 방법이 적합함을 알 수 있었다. ${\sigma}_{ov}({\sigma}_{s},\;{\sigma}_{d})$와 ${\sigma}_{oc}$ 수치 사이에는 좋은 상관관계를 보여주고 있으며 ${\sigma}_{d}$ 수치는 외삽법에 의해 얻어진 ${\sigma}_{oc}$ 수치와 잘 일치함을 나타냈다. ${\sigma}_{s}$와 ${\sigma}_{d}$의 비율로부터 얻어진 무차원 yield number$(N{\sigma}_{o})$는 고추장의 일시적 구조 존재여부를 결정하는데 사용될 수 있다. $N{\sigma}_{o}$로부터 계산된 fator ${\varepsilon}$의 수치$({\varepsilon}=0.100-0.169)$로부터 고추장은 강한 결착구조를 형성하고 있는 분산식품임을 알 수 있었다.

• Plant Resources
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• 제4권2호
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• pp.92-96
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• 2001

seeding rates(1.5,2.0,3.0 and 3.5$\ell$/10a). There were no differences in the yield components such as length of stem and ear diameter of stem number of branch, internode and ear, and yield of fresh and dry stem between the seeding methods with drilling and broadcasting, but yield components such as length of stem and ear, diameter of stem, number of branch, internode and ear, and yield of fresh and dry stem increased with seeding rates of from 2.5$\ell$ /10a to 3.5$\ell$/10a. Therefore potimum rates and methods of sowing were from 2.5$\ell$/10a to 3.5$\ell$/10a with seeding at the drilling and broadcasting.

• 한국연초학회지
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• 제3권2호
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• pp.115-122
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• 1981

Data for this study were obtained from Burley 21 (Nicotiana tabacum L.) grown under various densities on the field in 1978 and 1979 at the Jeonju Experiment Station, Korea Ginseng & Tobacco Research Institute. Interrelations between yield and its components were statistically studied by correlation, regression, and pathway analysis. Correlation of yield with plant population was significant and positive. Quadratic functions for yield vs. plant population and the length of the largest leaf were fitted to the data. Multiple recession equation between yield and its components (leaf number ($X_1$), a leaf area ($X_5$), weight per unit leaf area ($X_9$), plant population ($X_14$)), was significant at the 5% level. Measuring the relative importance of its components on yield, plant population was 49.5%, weight per unit leaf area 25.3%, a leaf 15.6%, and leaf number 9.8%.