• Title/Summary/Keyword: 근권

Search Result 488, Processing Time 0.027 seconds

Effect of Root Zone Cooling on Growth and Mineral Contents of Turfgrasses in Simulated Athletic Field during Summer Season (여름철 근권부의 냉온처리가 경기장 잔디의 생육 및 무기성분 함량에 미치는 영향)

  • 이혜정;송지원;구자형
    • Asian Journal of Turfgrass Science
    • /
    • v.15 no.4
    • /
    • pp.169-179
    • /
    • 2001
  • This study was conducted to determine the effect of root zone cooling on growth and quality of turfgrasses including Kentucky bluegrass (Poa pratensis L.‘Nuglade’), perennial ryegrass (Lolium perenne L.‘Accent’), tall fescue (Festuca arundinacea Schreb.‘Pixie’), and Japanese lawngrass (Zoysia japonica Steud.) in simulated athletic field during summer season in Korea. Mineral contents in clippings of turfgrasses grown at different soil mixtures and temperatures were also analyzed. Root zone cooling (approximately 4~6$^{\circ}C$ lower than that of untreated-control) resulted in good uniformity, little disease incidence and higher level of chlorophyll contents in cool-season turfgrasses. The effectiveness of root zone cooling in protecting disease incidence from high temperature stress was the most manifest in perennial ryegrass compared to others. Fresh clipping weight in treatment of root zone cooling was increased approximately 2 times in Kentucky bluegrass and perennial ryegrass, and 2.5 times in tall fescue compared to those of control. There was higher growth rate in a soil mixture composed of 80% peat moss +10% sand +10% soil (v/v/v) than in that of 80% pea moss +20% sand (v/v), Mineral contents of N, P, K, Ca, and Mg in clippings of three species of cool-season turfgrasses were significantly increased in treat-ment of root zone cooling but this was not found in Japanese lawngrass. Results showed that root zone cooling has a benefit in keeping good quality and growth of cool-season turfgrasses in sports field under supraoptimal ambient temperature during summer season.

  • PDF

An Evaluation of Plant Growth Promoting Activities and Salt Tolerance of Rhizobacteria Isolated from Plants Native to Coastal Sand Dunes (해안사구의 토착식물로부터 분리된 근권세균의 내염능과 식물성장촉진능 평가)

  • Hong, Sun Hwa;Lee, Mi Hyang;Kim, Ji Seul;Lee, Eun Young
    • Microbiology and Biotechnology Letters
    • /
    • v.40 no.3
    • /
    • pp.261-267
    • /
    • 2012
  • Coastal sand dunes are important for ecosystems due to the variety of rare species that can be found in this kind of habitat, and the beautiful landscapes they create. For environmental remediation, a potential strategy is phytoremediation using the symbiotic relationship of plants and microbes in the rhizosphere, which has proven ecologically sound, safe, and cost effective. Ninety-five colonies were isolated from the rhizosphere soil (RS) or rhizoplane (RP) of Rorippa islandica, Rumex crispus, Artemisia princeps var. orientalis, Lilium sp Stellaria media, and Gramineae. These colonies were then tested for plant growth promoting activities (PGPAs) such as 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, and siderphores synthesis ability. In addition, salt tolerance was evaluated at 4% and 8% salt concentrations. It was observed that amongst the test subjects about 50% of the strains had a high resistance to salinity. Many of them could produce indole-3-acetic acid (IAA) IAA (in RS 13.9% and in RP 7.6%), exhibited ACC deaminase activity (55.8% in RS and 36.6% in RP), and could synthesize siderphores (62.7% in RS and 50% in RP). Correlation coefficient analyses were carried out for the three kinds of plant growth promoting abilities (PGPA) and salt tolerance. A positive correlation was found between an ability to synthesize siderphores and ACC deaminase activity (r=0.605, p<0.037). Similarly, positive correlations were noted between salt tolerance and ACC deaminase activity (r=0.762, p<0.004, r=0.771), and salt tolerance and an ability to synthesize siderphores (r=0.771, p<0.003).

Effect of Root Zone Temperature during the Night on the Growth and yield of Perlite Cultured Tomato in Winter (겨울철 토마토 2단말식 펄라이트경에서 야간 근권 온도가 토마토의 생육 및 수량에 미치는 영향)

  • 이한철;강경희;권기범;최영하
    • Journal of Bio-Environment Control
    • /
    • v.10 no.1
    • /
    • pp.30-35
    • /
    • 2001
  • This experiment was undertaken to investigate the effect of root zone temperature during the night on absorption of mineral nutrients, growth, and fruit yield of the truss-limited hydroponic tomatoes in winter. The root zone temperature was either controlled to 10, 15, 20, $25^{\circ}C$, or left uncontrolled at ambient temperatures. Temperature of the covered beds rose as root zone temperature was raised, but it in all treatments was less than 3$^{\circ}C$ higher than that in the control. Raising root zone temperature, except $25^{\circ}C$, showed positive effect on plant height, leaf length, stem diameter, and plant fresh and dry weight, but not on T/R ratio which was the greatest in the control. Root activity in all treatments except $25^{\circ}C$ increased as compared to the control. Mean fruit weight, fruit count per plant, and fruit yield were the greatest in 2$0^{\circ}C$ treatment. Root zone temperature did not significantly affect the contents of total nitrate and magnesium in leaves, stems and roots. Concentrations of phosphate and calcium increased in leaves and stems, but decreased in roots as root zone temperature increased. Overall, 2$0^{\circ}C$ treatment gave the greatest growth and energy efficiency.

  • PDF

Effect of Root Zone Temperature on the Induction of Inflorescence of Phalaenopsis in Summer (하절기 근권 온도가 팔레놉시스의 화경 발생에 미치는 영향)

  • Lee, Dong-Soo;Lee, Young-Ran;Yae, Byeong-Woo
    • Horticultural Science & Technology
    • /
    • v.29 no.1
    • /
    • pp.10-15
    • /
    • 2011
  • The influence of root zone temperature to the induction of inflorescence and growth of Phalaenopsis was investigated. Root zone temperatures were 15, 20, 25, and $30^{\circ}C$, while the air temperature was kept over $28^{\circ}C$ during three months. $CO_2$ uptake, fresh weight, dry weight and branched root number of Phalaenopsis were highest at $25^{\circ}C$ and lowest at $15^{\circ}C$. But, the anthocyanin content was highest at $15^{\circ}C$ and lowest at $25^{\circ}C$. Inflorescence was not induced by root zone cooling temperature below $25^{\circ}C$ for three months. The concentrations of K, Ca and Mg in leaves were changed according to the root zone temperature, but those of N and P were not changed. K content was high at $20^{\circ}C$, whereas Ca and Mg contents were high at $25^{\circ}C$ root zone temperature. This study indicates that Phalaenopsis perceives temperature by shoot and the optimum root-zone temperature for the vegetative growth is $25^{\circ}C$.

Soil Mineral Nutrients and Microbes Are Responsible for Large Patch Disease Caused by Rhizoctonia solani AG2-2 in Zoysiagrass Turf (골프장 한국잔디의 Rhizoctonia solani AG2-2에 의한 Large Patch 발생 토양에서 근권 미생물과 무기영양 평가)

  • Chang, Tae-Hyun;Ru, Yeon-Ju;Lee, Yong-Se
    • Asian Journal of Turfgrass Science
    • /
    • v.21 no.2
    • /
    • pp.113-126
    • /
    • 2007
  • Mineral nutrients and population dynamics of soil microbes in the root zones of zoysiagrass infected by Rhizoctonia solani AG2-2 and that of healthy plants were sampled from ten golf courses using a cup cutter(diameter $10\;cm\;{\times}\;8\;cm$ deep). Analysis of variance(ANOVA) showed significant differences in content of $NO_3$-N(P = 0.05), $NH_4$-N(P = 0.1), and K(P = 0.1) between infected and healthy samples. The content of $NO_3$-N in the soils of large patch was 9.49 mg/kg and that in soil of healthγ plants was 7.02 mg/kg. However, the content of $NH_4$-N in the soil of large patch was 12.02 mg/kg whereas 14.40 mg/kg for the soil under the healthy plants. The content of K in the soil of large patch was lower than that of soil of healthy plants. There was few numbers of Pseudomonas colonies In the soils of large patch compared to that of healthy plants. These results indicated that the content of $NO_3$-N, NH4-N, and K and the microbial population dynamics in root zones correlated to occurrence of large patch.

Effect of Rhizosphere Restriction on Yield and Quality of Melon (Cucumis melo L.) (멜론의 수량과 품질에 미치는 근권제한의 효과)

  • 박동금;권준국;이재한;엄영철;최영하
    • Proceedings of the Korean Society for Bio-Environment Control Conference
    • /
    • 1998.10a
    • /
    • pp.134-137
    • /
    • 1998
  • 최근 고급 과채류에 대한 선호도가 높아짐에 따라 네트멜론의 재배가 증가되고 있는 추세이다. 그러나 주산단지에서는 고정된 시설에서 주년 재배하므로서 연작으로 인한 토양병해충 발생이 증가되고 염류집적 등의 문제가 심화되고 있다(박, 1995). 멜론 재배기술이 비교적 앞서 있는 일본에서는 이러한 연작장해를 회피하기 위한 방법으로 격리상이나 차근시트 등을 이용한 근권제한재배에 관한 연구가 다년간 이루어져 왔다. (중략)

  • PDF

Study on New-System Development of Soilless Culture - About Intermittent Soaking System of Soilless Culture - (새로운 수경재배방식 개발에 관한 연구 - 간헐침전식 수경재배시스템에 관하여 -)

  • 양원모
    • Proceedings of the Korean Society for Bio-Environment Control Conference
    • /
    • 1992.12a
    • /
    • pp.29-30
    • /
    • 1992
  • 최근 근권의 산소부족 문제를 근본적으로 해결할 수 있는 수경능법으로서 분무경에 관한 관심은 매우 높으며 분무경의 우수성이 실증적으로 제시되고 있으나 분무경의 경우 고압을 필요로 하므로 장치가 복잡해지거나 엽체류의 경우 분무노즐과의 거리에 따라 생장이 균일하지 않는 문제점을 갖고 있으므로 분무경과 같이 근권산소 문제를 근본적으로 해결하는 효과를 가지면서도 취급 및 관리가 편리한 수경시스템의 개발이 절실히 요구되고 있다. (중략)

  • PDF

고형배지경을 이용한 과채류 재배

  • 이용범
    • Proceedings of the Korean Society for Bio-Environment Control Conference
    • /
    • 1994.05a
    • /
    • pp.34-54
    • /
    • 1994
  • 1. 고형배지특성 (1) 물리화학성 토양재배에서는 토양이 갖고 있는 다양한 완충작용, 즉 보수, 통기성, 비료성분의 보유능력이 대단히 높기 때문에 연작장해가 없는 한 작물생산에서 안정적 생산이 가능하다. 반면에 양액재배에서는 이러한 완충능을 기대하기가 어렵다. 특히 배지에 따른 물리화학성의 차이가 있고 이들 배지의 활용을 근본적으로 근권환경의 제어라는 측면에서 기존의 토양재배보다 높은 생산성과 고품질을 요구하고 있는 실정이기 때문에 배지에 따른 적정 근권환경제어가 필요하다. (중략)

  • PDF

Selection of Biocontrol Agents against Phytophthora Blight of Pepper and Its Root Colonization Ability (고추역병 생물적방제 근권세균의 선발 및 근권정착 능력 연구)

  • Zhang, Li-Jing;Shi, Hong-Zhong;Wang, Jing-Jing;Chang, Shu-Xian;Shen, Shun-Shan
    • Research in Plant Disease
    • /
    • v.16 no.2
    • /
    • pp.158-162
    • /
    • 2010
  • Four promising biocontrol agents against Phytophthora capsici were selected from 507 bacterial isolates collected from rhizosphere soils and roots of pepper plants. In vitro experiment, these four biocontrol agents inhibited mycelial growth, germination of cystospores, and formation of zoosporangia and zoospores of Phytophthora capsici. In the pot experiment, the four biocontrol agents showed control efficiency higher than 70%. In greenhouse experiment, the isolates G28-6 gave the control value of 79.4%. These four biocontrol agents successfully colonized in the population density beyond 105 cfu/g on roots of pepper in vitro. The isolates G28-6 was identified as Pseudomonas aurantiaca, based on its cultural, morphological, and biochemical characterization and 16S rRNA gene sequence analysis.