• Asian-Australasian Journal of Animal Sciences
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• 제12권6호
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• pp.854-861
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• 1999

Seventeen pregnant ewes (8 superovulated and 9 non-superovulated) were used to study correlations of maternal serum progesterone concentrations with uterine and fatal weights at weeks 7 and 15 of pregnancy. Statistical analyses indicated that uterine growth during the first 7 weeks of pregnancy highly associated with maternal serum progesterone concentration (r=0.87 and 0.85, with wet and dry uterine weights, respectively). Ewes with higher maternal serum progesterone concentrations had higher total and average fetal weights at week 7 of pregnancy (r=0.89 and 0.86, respectively). At week 7 of pregnancy, wet and dry uterine weights highly correlated (p<0.01) with total and average fatal weights (r=0.99 and 0.80, 0.98 and 0.75, respectively). Maternal serum progesterone concentrations, however, did not correlate (p>0.05) with wet and dry uterine weights (r=0.36 and 0.47, respectively) and with total and average fetal weights (r=0.20 and 0.58, respectively) at week 15 of pregnancy. However, wet and dry uterine weights had high correlation with total fetal weight (r=0.97 and 0.95, respectively), without significant correlation with average fetal weight. It was concluded that during the embryonic stage of pregnancy, the levels of maternal progesterone were highly correlated with uterine and fetal growths, while during the fetal stage pregnancy, the correlation became less evident.

• 한국초지조사료학회지
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• 제9권3호
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• pp.135-140
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• 1989

This experiment was to study the relationship between shoot and root system in perennial ryegrass at different stages of growth. The results are summarized as follows; 1. The dry weight of shoot was significantly correlated with the dry weight of root at both stages of growth. 2. The yield components of shoot and root systems were changed by the stages of growth. Thus, the dry weights of shoot and root were positive correlated with the number of tillers and roots at 60 days after sowing. But, the dry weights of shoot and root were positive correlated with the dry weight of root, the dry weight of tiller, length of plant and length of root at 90 days after sowing. 3. Maprirna variety was obtained a higher dry weights of shoot and root at 60 days after sowing, but, Alta variety was obtained at 90 days after sowing, respectively. 4. The dry weight of shoot was positive correlated with leaf area at both stages of growth. 5. The dry weight of shoot was significantly negative correlated with specific leaf weight at 60 days after sowing, but positive correlated with specific leaf weight at 90 days afikr sowing. 6. The dry weight of root was smcantly positive correlated with leaf area at 60 days after sowing, but not recognized at 90 days after sowing.

• 한국작물학회지
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• 제35권4호
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• pp.328-333
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• 1990

재식밀도가 수도의 부위별 건물의 배분에 미치는 영향을 검토하고자 통일계인 삼강벼와 일반계인 추청벼를 1988년 5월 30일과 6월 15일에 3.3$m^2$당 72주, 90주 및 120주로 이항재배하여 조사한 결과를 요약하면 다음과 같다. 1. 공시품종 다같이 출수 20일전과 출수기의 단위면적당 총건물중은 5월 30일 이앙이 6월 15일 이앙보다 많았으며, 두 이앙기 모두 재식밀도가 높아질수록 건물중이 증가하였는데, 부위별 건물중의 변화도 총건물중과 같은 경향이었다. 2. 주당 총건물중 및 부위별 건물중도 5월 30일 이앙보다는 6월 15일 이앙에서 낮았으나, 단위면적당의 경우와는 달리 재식밀도가 높아질수록 감소하였다. 3. 동일한 이앙기와 재식밀도에서 엽신, 엽소 및 간의 건물중은 두 품종간에 차이가 적었으나, 삼강벼는 수중이 무거워서 총건물중이 추청벼보다 많았다. 4. 두 품종 모두 부위별 건물배분율은 이앙기나 재배밀도에 관계없이 생육시기별로 거의 일정하였다. 5. 이앙기와 재배밀도를 종합한 부위별 평균 건물배분율을 가지고 추정한 시기별 각 부위의 건물중은 실측한 건물중과 잘 일치하였다.

• 원예과학기술지
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• 제32권2호
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• pp.165-170
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• 2014

본 연구는 완전제어형 식물공장에서 선형 지수 함수를 이용하여 재식거리($15{\times}10$, $15{\times}15$, $15{\times}20$, $15{\times}25$cm)에 따른 씀바귀의 생육과 수량 모델을 개발하고자 수행되었다. 개체당 건물중은 25cm 처리구가 가장 높았으며, 10cm 처리구가 가장 낮았다. 단위면적당 건물중으로 보면 15cm 처리구가 가장 높았으며, 25cm 처리구가 가장 낮았다. 따라서 씀바귀 생육을 위한 적정 재식밀도와 재식거리는 각각 44 plants/$m^2$와 $15{\times}15$cm였다. 정식 후 일수에 따른 건물중의 변화 곡선은 선형 지수적인 형태를 보였으며, 재식거리에 따른 선형 지수 형태를 이용하여 모델식을 예측할 수 있었다. 개체당 건물중과 개체당 생체중과의 관계는 재식거리와는 무관하게 직선적인 관계를 보여, 건물중 예측으로 생체중도 예측할 수 있었다. 선형 지수 함수식에서 작물생장율과 상대생장율, lost time는 쌍곡선 형태를 보였다. 씀바귀의 광사용효율는 $4.3-6.1g{\cdot}MJ^{-1}$였다. 재식거리에 따른 씀바귀의 생육과 수량은 선형 지수 함수식으로 정확하게 예측할 수 있었다. 결론적으로, 선형 지수 함수는 완전제어형 식물 공장에서 씀바귀의 생육과 수량을 예측하는데 유용한 함수였으며, 생육과 수량 모델을 개발할 수 있었다.

• Journal of Plant Biology
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• 제30권1호
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• pp.59-67
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• 1987

To verify allelopathic effect of tomato plants a number of labovatory experiments, seed germination and seedling growth with aqueous extracts and leachates form the tomato plants, have performed. Germination percentage of the tested species was decreased by treatment with leaf, stem and root extracts as extracting time elapses. The leaf extract more inhibits the germination of the seeds than both stem and root extracts. Leachate collected from the tomato plants decreases as much as 50% of the growths in elongation as well as dry weight of seedlings of lettuce and egg plant. It is observed that with a paired-plants grown in U tube pot the tomato roots have excreted allelochemicals to inhibit the growth of the tested species and volatile substances from the tomato plants have suppressed to dry weights of lettuce, to elongation and dry weights of grapevine planted near the tomato plants.

• 한국산림과학회지
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• 제112권4호
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• pp.472-489
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• 2023

본 연구는 우리나라 주요 침엽수종인 일본잎갈나무와 리기다소나무의 생중량과 건중량 도출을 위한 최적 추정식 도출과 최적 중량식에 의한 중량표를 개발하기 위해 수행되었다. 중량표를 개발하기 위하여 전국에 분포하고 있는 일본잎갈나무 150본, 리기다소나무 90본, 전체 240본을 샘플링하여 현장에서 생중량을 측정하고, 각 부위별 시료를 채취하여 실험실에서 건중량을 측정하였다. 원목의 생중량과 건중량을 추정하기 위하여 이용한 식은 흉고직경의 1변수식, 그리고 흉고직경과 수고를 이용하는 2변수식으로 구분하였다. 또한 생중량 및 건중량 추정식들에 대해 적합성 검증을 위하여 적합도지수(FI), 평균제곱근오차(RMSE), 추정표준오차(SEE), 잔차도 등의 통계량을 이용하였으며, 도출된 최적식에 의해 중량을 계산하여 적용성을 검토하였다. 이 결과 흉고직경만을 이용할 때 W = bD+cD² 그리고 흉고직경과 수고를 이용할 때 W = aD^bH^c가 선정되었다. 선택된 1변수 중량추정식 W = bD+cD²의 적합도지수는 0.91였으며, 2변수 중량추정식 식 W = aD^bH^c의 적합도지수는 0.95로 모두 높게 나타났다. 이들 추정식으로 일본잎갈나무와 리기다소나무에 대한 생중량 및 건중량표를 새롭게 작성하였으며, 20년전의 중량표와 비교할 때 두 수종 모두 생중량 및 건중량이 기존 중량표가 큰 것으로 나타났다.

• 한국연초학회지
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• 제11권2호
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• pp.115-126
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• 1989

This study was conducted to determine the time and methods of predicting tobacco yield, by studying the relationship of yield components to yield. 1. The relationship between each position in leaf dry weight and approached gradually each other and also correlation coefficient of top leaf was higher than that of lower leaf. The leaf dry weight per plant was highly correlated with leaf area from 16th leaf position on stalk. Leaf dry weight of each leaf position on stalk was highly correlated with leaf dry weight per plant at 14 to 16th leaf position. 2. The correlation coefficient between leaf dry weight and leaf area per plant was higher at the late growth stage than at the early growth stage, and higher between the near stages. Correlation coefficient between leaf dry weights was higher than that of leaf areas. 3. Flue-cured tobacco yield be estimated from leaf dry weight per plant at 50 to 55 days after transplanting. 4. Air-cured tobacco yield could be predicted from leaf dry weight per plant at 60 days after transplanting.

• 한국작물학회지
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• 제47권4호
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• pp.286-291
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• 2002

Seedling establishment of soybean [Glycine max (L.) Merr.] is a critical factor in production system and cultural practices. The objective of this study was to identify the components of soybean seedling developments encompassing planting dates and cultivars that respond to emergence, early growth stage and dry matter accumulation. Three soybean cultivars, Hwangkeumkong, Shinpaldalkong 2, and Pungsannamulkong, were planted at Baegsan silty loam soil. Planting date was May 13, June 3, and June 24 in 2001. Sprinkler irrigation was accompanied with 30mm after seeding for three planting dates. Soybean seedlings were sampled at the growth stages from VE to V5. Days to emergence of soybean seedlings were taken 8 at May 13 and 5 at June 24 plantings. Emergence percentage was over 90 at three planting dates. May 13 planting took 33 days and June 24 planting was 25 days for reaching V5 growth stage. Cotyledon number was decreased after V2. Significant cultivar difference was found in cotyledon dry weight until V2 which differed in seed dry weights at the planting times. Leaf and total dry weights of soybean seedlings were not differed from V1 to V3 among planting dates and cultivars. Leaf water contents were generally ranged 78 to 85%. Branch was appeared from V4. Leaf/stem ratio among cultivars was similar at five growth stages and gradually increased from 2.1 at V1 to 2.8 at V5. The results based on this experiment indicated that seedling establishment of soybean was continued from VE to V3 growth stages affecting mainly by planting date and soil moisture.

• Mycobiology
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• 제33권1호
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• pp.23-29
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• 2005

The effects of different concentrations of three amino acids as carbon and or nitrogen sources on mycelial dry weights, changes in pH values of synthetic medium, ammonia secretion and extracellular protease activity by three zoosporic fungi, pathogens of fish and shellfish, were studied. As compared with the control, the addition of isoleucine and aspartic acid as nitrogen sources were generally stimulative for mycelial dry weight production whereas phenylalanine was inhibitory irrespective to the tested fungal species. When amino acids served as carbon and nitrogen sources, the mycelial dry weights of the three fungi were increased (mostly non-significantly) relative to untreated control but weights were decreased as the concentrations of the three amino acids raised. The addition of individual amino acids as carbon and nitrogen sources to the medium significantly increased pH values of the medium comparable to the control. The addition of each of the three amino acids as carbon and nitrogen sources to the medium significantly induced ammonia secretion by the three species of zoosporic fungi. Ammonia secretion in synthetic medium amended with amino acids as nitrogen source raised by the three zoosporic fungi relative to untreated control except in case of Achlya racemosa treated with isoleucine. Extracellular protease activity was almost promoted in case of Achlya proliferoides and Saprolegnia furcata cultures treated with isoleucine and aspartic acid individually in presence of glucose and vice versa in case of phenylalanine. However, extracellular protease activity of A. racemosa decreased compared with the control at various concentrations of isoleucine and both phenylalanine and aspartic acid assumed inconsistent effects. Extracellular protease activity of the three zoosporic fungi in the medium devoid of glucose varied depending upon zoosporic fungal species, the tested amino acid and the applied concentrations. The values of protease activity were approximately less two folds than that obtained in presence of glucose.

• 원예과학기술지
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• 제30권2호
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• pp.201-207
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• 2012

본 연구는 딸기 소식물체의 급속대량 증식을 위한 기내배양에서 적정한 지지물과 최적의 MS 배지 이온강도를 구명하기 위해 수행되었다. 딸기($Fragaria$ $ananassa$ 'Houkouwase') 절편체는 지지물로 agar와 Tosilee(상업적 플러그 육묘용 배지) 배지를 사용하고, 공급된 MS 배지는 기본 MS(대조구), 1/2 MS, 1/4 MS의 강도로 공급하여 자가영양배양 하에서 미세증식하였다. Agar 배지에서 생육을 비교했을 때 1/2 MS 강도에서 초장과 근장이 가장 길었다. 또한 1/2 MS 강도에서 지상부 생체중과 건물중, 그리고 엽면적이 1/4 MS와 기본 MS 강도에서보다 우수했다. 기본 MS의 Tosilee 배지에서 딸기 소식물체를 배양했을 때 초장, 근장, 지상부와 지하부의 생체중과건물중이 agar 배지에서 배양했을 때보다 더 양호했다. 자가영양배양을 통한 기내미세번식 딸기 소식 물체는 1/2 MS 강도의 agar 배지에서 배양하기보다는 기본 MS 강도의 토실이배지에서 가장 우수한 생육을 나타냈다.