• The Korean Journal of Ecology
• /
• 제9권1호
• /
• pp.73-78
• /
• 1986

The effects of density and soil nutrient regime on competition between individuals in pure and mixed populations of two annuals. Chenopodium album and Digitaria sanguinalis were investigated at the level of enegy allocation. Seedling emergence of two species was extremely high (>90%) in both pure and mixed culture irrespective of the density and nutrient regime, but percentage of seedling establishment or fertile plant became gradually low with increasing density owing to 'self-thinning'. The mean plant dry weight was significantly reduced with increasing density and decreasing soil fertility. The dry matter production of D. sanguinalis in mixture was markedly greater than in pure culture under medium and high density. Also, as considered the number of seed production as reproductive allocation, relationship between them and the number of seed production per plant showed a similar tendency. Therefore, these results indicated that D. sanguinalis had a greater competitive advantage than C. album and energy allocations to variious organs were regulated by plastic response rather than determined genetically.

• 한국작물학회지
• /
• 제47권4호
• /
• pp.279-282
• /
• 2002

Oryzalexine A, a potent growth inhibitor against several weeds such as Digitaria sanguinalis (L) Scop., and Amaranthus lividus L. was purified by conventional solvent partitioning and column chromatographies. This substance showed strong inhibitory activity on several weeds: Germination of seeds of Poa annua L. was inhibited by 36.5 % at 1.0 mM and Amaranthus lividus L. by 56.1% at 2.5mM. Growth of root and shoot of Digitaria sanguinalis (L.) Scop. by 10.2% and 22.4% at 2.5mM, respectively. These suggest that Oryzalexine A in rice straw might affect the germination and growth of susceptible weeds and other plants.

• 한국초지조사료학회지
• /
• 제16권2호
• /
• pp.139-146
• /
• 1996

An experiment was canied out to investigate how to effect the application of nitrogen, phosphate and potassium on the vegetation and dry matter yield in the mixed sward of Ladino clover and crabgrass(Digitaria sanguinalis [L.] Scop.). The experimental sward was consisted of eight plots of non-application, K, P, PK, N, NK, NP and NPK. These plots were sown with seeds mixture of Ladino clover 5.0kg/ha and crabgrass 17.5kg/ha on 17 April 1976 in the forage experimental field of Kangwon National University, Chunchon, Korea, and were cut three times from 6 July to 4 October 1976.

• 한국전자현미경학회:학술대회논문집
• /
• 한국현미경학회 1998년도 제29차 춘계학술대회
• /
• pp.36-37
• /
• 1998

• The Korean Journal of Ecology
• /
• 제19권1호
• /
• pp.71-80
• /
• 1996

The effects of simulated acid rain on the growth and interspecific competition of Echinochloa crus-galli and Digitaria sanguinalis were studied. Changes of growth in height and dry weight were examined and competition between the two species was investigated using the experimental model proposed by de Wit (1960). The experiments were carried out in the greenhouse, and test plants were germinated and grown for 4 weeks and then sprayed with simulated acid rain of pH 5.6, 4.2 and 2.8 for another 8 weeks. In de Wit replacement experiments, the variation of density and the treatment of simulated acid rain showed little effect on the interspecific competition between E. Crus-galli and D.sanguinalis. The ratio diagram, another method to reveal the interrelations between two competing species, always showed the predominance of E. crus-galli in competition, regardless of density and pH. The interspecific competition of the two species, represented by relative yield total (RYT), revealed that intraspecific competition was stronger than interspecific competition in both species.The treatment of simulated acid rain showed little effect on the growth of E. Crus-galli and D. sanguinalis. Height growth of both species did not differ from that of control (pH 5.6), but root/shoot ratio increased with the decrease in pH of simulated acid rain. Growth of tatal dry weight of E. crus-galli and D. sanguinalis was not influenced by the change of pH, except that D.sanguinalis showed a decrease in the total dry weight at pH 2.8 along with a visible sign of white spots on leaves. Physical environmental conditions can exert an effect on the interrelationships between the two species, but this experiment did not show the reversion of competition, and showed that E.crus-gilli was competitively dominant under any environmental conditions given in this study.

• 한국환경생태학회:학술대회논문집
• /
• 한국환경생태학회 2006년도 임시총회 및 학술논문발표회
• /
• pp.218-221
• /
• 2006

• 한국환경생태학회:학술대회논문집
• /
• 한국환경생태학회 2006년도 임시총회 및 학술논문발표회
• /
• pp.214-217
• /
• 2006

• 한국식물병리학회지
• /
• 제1권1호
• /
• pp.38-43
• /
• 1985

한국에서 처음으로 벼못자리와 폿트에 자란 모에서 세균성갈색줄무늬병을 기록하였다. 포장에서 자란 이병식물로부터 분리한 균주를 주사 또는 침접종한 결과, 자연상태의 병징과 비슷하였다. 공시한 10과 11종의 화본과식물 중에서 Echinochloa crusgalli, Digitaria sanguinalis, Setaria viridis는 본 병원세균의 새로운 기주로 밝혀졌다. 생화학적 특성 및 병원성등을 토대로 본 세균을 Psudomonas avenae Manns로 동정하였다.

• 아시안잔디학회지
• /
• 제26권1호
• /
• pp.60-66
• /
• 2012

본 연구에서는 잔디밭 문제 잡초인 바랭이(Digitaria sanguinalis L.)와 민들레(Taraxacum platycarpum H. DAHLST.)에 대한 약용식물 추출물 23종의 살초활성을 조사하였다. 페트리디쉬 검정에서 효과가 나타난 약용식물 추출물을 선발하여 포트에서 발아전 처리를 하였으며, 그 결과 바랭이에서는 울금(61%)과 천궁(62.5%) 추출물에서 발아억제 효과가 나타났으며, 민들레에서는 가죽나무(77.8%) 추출물에서 발아억제 효과가 나타났다. 경엽처리에서는 두 초종 모두 가죽나무 추출물에서 살초효과가 우수한 것으로 나타났다.

• 한국초지조사료학회지
• /
• 제43권1호
• /
• pp.28-34
• /
• 2023

본 시험은 하계자생작물인 사료 피 '제주피', 강아지풀(국내 생태형), 바랭이(국내 생태형)의 파종량에 따른 생육특성 및 생산성을 조사하기 위해 충청남도 천안시 소재 국립축산과학원 축산자원개발부 초지사료포장 무경운 논에서 2020년 부터 2022년 까지 3년 동안 수행하였다. 사료 피와 강아지풀은 파종량이 증가함에 따라 증가하는 경향을 보였으며 사료 피는 40 kg ha^-1 처리에서, 강아지풀은 60 kg ha^-1 처리에서 최대 수량을 보였다. 그러나 바랭이는 4-16 kg ha^-1 처리에서는 비슷한 수량을 보였으며 60 kg ha^-1 처리에서 최대 수량을 보였다. 그리고 건물수량은 사료 피(9,681~11,092 kg ha^-1) > 바랭이(8,311~9,023 kg ha^-1) > 강아지풀(3,145~4,749 kg ha^-1) 순으로 나타났다. 하계자생작물인 사료 피, 강아지풀, 바랭이의 파종량에 따른 단백질함량은 바랭이 > 사료 피 > 강아지풀 순으로 ADF와 NDF 함량은 사료 피 > 바랭이 > 강아지풀 나타났으며 통계적인 차이는 보이지 않았다. 이상의 결과에서 제시한 바와 같이 논을 이용한 이모작 작부체계에서 안정적으로 조사료를 생산하기 위해서는 자생하계사료작물 도입은 매우 중요할 것으로 판단된다.