• Title/Summary/Keyword: crop growth experiment

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Analysis of growth characteristics and carotenoids and phenolic compounds contents of Ixeris dentata

  • Jin, Mei Lan;Lee, Sang Hoon;Park, Yun Ji;Yoon, Jeong Su;Lee, Sang Won;Hur, Mok;Koo, Sung Cheol;Lee, Woo Moon;Park, Chun Geun;Park, Sang Un;Kim, Jae Kwang;Chang, Jae Ki;Kim, Yeon Bok
    • Korean Journal of Agricultural Science
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    • v.46 no.1
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    • pp.163-172
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    • 2019

  • Ixeris dentata is a perennial plant belongs to Compositae family and it has been considered as a potential therapeutic agent in many biological activities like detoxification, elimination of blood stasis, anti-inflammatory, and analgesia. The I. dentata used in this experiment was collected in four areas of Yangpyeong, Dangjin, Chuncheon and Goesan, then transplanted to the farm of Department of Herbal Crop Research in National Institute of Horticultural and Herbal Science. The growth characteristics of I. dentata were investigated after harvesting. The aboveground biomass of plants collected from Chuncheon area was exhibited best, and the biomass of root in YangPyeong was showed best as 3.65 g/plant in dry weight. Based on the HPLC analysis, the leaf of I. dentata collected from Dangjin area was highest in carotenoids contents ($1,213{\mu}g/g$ dry weight), and the leaf of Chuncheon area was exhibited maximal phenolic compounds ($1,918{\mu}g/g$ dry weight). The results of this study could provide fundamental formation for selection of standard varieties of I. dentata and development of functional material by analysis of the growth characteristics and the contents of carotenoids and phenolic compounds.

  • https://doi.org/10.7744/kjoas.20190006 인용 PDF KSCI HTML

Quantification of Momilactones A and B in Rice Straw

  • Lee, Choon-Woo;Koichi Yoneyama;Yasutomo Takeuchi;Ryu, Su-Noh
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.47 no.4
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    • pp.283-285
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    • 2002

  • Momilactones A and B, the major phytotoxins and phytoalexins in rice plants, were quantified by a HPLC-APCI-MS-MS (APCI-MS-MS) system under multiple reaction monitoring conditions. Since MA and MB were found to be easily extracted with water, these phytotoxic compounds may affect germination and growth of other plant species when the rice straws were left in the fields.

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Regulated Deficit Irrigation and Its Several Problems in Practical Use

  • Huanjie Cai;Shaozhong Kang
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.42
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    • pp.31-37
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    • 2000

  • Regulated Deficit Irrigation (RDI) is one of the most important measures for the water-saving and high yield of crops. RDI is based on the crop and water relations. The theories of RDI were analyzed using the experiment data in Shaanxi and Gansu Province. There are several problems of RDI in practical use, which include; the uncertainty of crop-water relations, the proper growth stages and water deficit degree of RDI applied, and the requirements of RDI to irrigation system and irrigation techniques.

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Changes of Major Components and Growth Characteristics According to Harvesting Times of Artemisia capillaris Thunberg (사철쑥의 수확시기에 따른 생육특성과 주성분 변화)

  • Ju, In-Ok;You, Dong-Hyun;Song, Young-Eun;Jang, Ik;Ryu, Jeong;Choi, So-Ra
    • Korean Journal of Medicinal Crop Science
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    • v.15 no.3
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    • pp.189-193
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    • 2007

  • We investigated the changes of growth characteristics and major components according to harvesting times in Artemisia capillaris. Flower buds farmed on July 30 and flowers were all open on August 30 and seeds were mature in September, As the growth by harvesting time was the best on August 30 so fresh weight and dry weight were the highest. Especially, in this time, plants had no leaves and fresh weight was investigated as 243.7 g composed of 109.6 g capitulum and 134.1 g stem. Scoparone content, a major component, was the highest as 6.50 mg/g DW in capitulum on August 30. Also capillarisin appeared in both leaf and capitulum except stem and capitulum was shown the most capillarisin content as 1.65 mg/g DW on July 30.

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Ecology and Growth of Weeds and Weedy Rice in Direct-seeded Rice Fields (직파재배답(直播栽培沓)에서의 잡초(雜草) 및 적미(赤米) 발생(發生) 생태(生態))

  • Choi, C.D.;Moon, B.C.;Kim, S.C.;Oh, Y.J.
    • Korean Journal of Weed Science
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    • v.15 no.1
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    • pp.39-45
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    • 1995

  • This experiment was carried out at Yeongnam Crop Experiment Station since 1992 to obtain basic information on ecology of weeds and weedy rice in direct-seeded rice fields. Annual grass weeds of Echinochloa sp., Leptochloa sp., Digitaria sp. and Setaria sp.(C4 plant) and weedy rice(C3 plant) were important species in direct seeded rice compared to transplanted rice field. Period of seedling emergence of barnyard grass was varied from 8 days to 20 days depending on seeding date while it was shorter 4 to 6 days than rice. Weed occurrence and the degree of yield loss were varied by cultivation method. In direct seeding method weeds increased 2 to 3 times compared to manual transplanting. The greatest yield loss was recorded in direct seeding(40 to 100%) followed by mechanical transplanting(25 to 35%) and hand transplanting(10 to 20%), in order. Double cropping of rice-barley was reduced weeds about 30% than rice single crop due to alleopathic effect of barley residue or stubble. Weedy rice(red rice) occurrence was closely related with seeding date and tillage methods. Early seeding and reduced tillage enhanced the growth of weedy rice.

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