• Title/Summary/Keyword: 단옥수수

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Temperature and Sweet Corn Production at Different Planting Dates under Polyethylene Tunnel and Mulch (파종기와 Polyethylene 필름 피복방법이 단옥수수 생산에 미치는 영향)

  • 이석순;김태주
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.31 no.1
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    • pp.84-90
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    • 1986

  • An experiment was conducted to know the effects of planting dates (March 5, 15, and 25 and April 4) and transparent polyethylene (P.E.) film treatments(tunnel, tunnel slit, and mulch) on air and soil temperatures and growth and yield of a sweet corn variety, Great Bell. Maximum air and soil temperatures and minimum air and soil temperatures were greater at tunnel>tunnel slit>mulch in that order. Differences in maximum air and soil temperatures among the P.E. film treatments were much greater than those in minimum air and soil temperatures. However, when film was opened due to high air temperature over 40$^{\circ}C$ in the tunnel, air temperature was similar but soil temperature was lower com-pared to mulch. High temperature stress could be avoided in tunnel slit without opening film by increase in the number of slits. Cold damage of corn seedlings was avoided by tunnel and reduced by tunnel slit, and frost-damaged seedlings under the mulch were recovered in few days. The number of days from planting to silking was reduced as planting date delayed. At early plantings, tunnel enhanced early growth and silking, but it delayed at late plantings because tunnel was opened during the most of day time due to high temperature. Black streaked dwarf virus(BSDV) disease was more severe at early plantings and it was reduced in tunnel slit at late plantings because plants were grown under the film at the time of infection. The number of marketable ears was similar among all treatments except mulch at March 5 planting where BSDV was severely infected. Gross income was high in tunnel and tunnel slit at March 25 planting which had more larger marketbale ears and tunnel and tunnel slit at March 5 planting which had higher market price.

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Effect of Plant Populations on the Number and Weight of Ear and Gross Income in Sweet Corn (재식밀도가 단옥수수의 이삭수, 이삭무게 및 조수입에 미치는 영향)

  • 이석순;백준호
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.35 no.2
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    • pp.117-121
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    • 1990

  • A sweet corn hybrid, Golden Cross Bantam 70, was grown at 5 plant populations (5,000, 6,000, 7,000, 8,000, and 9,000 plants/10a) under the transparent P .E. film mulch to find the best yield evaluation method. Plant population did not affect early plant growth, culm length, ear height, and silking date. However, number of tillers at harvest decreased but leaf area index increased with increased plant population. Marketable ears were divided into two classes; the first grade of which husked ear weight over l50g (unhusked ear weight 230g) and the second grade of which husked ear weight between 100 and 150g (unhusked ear weight between 180 and 230g) according to the whole sale market price. Average length, thickness, and weight of marketable ears over 100g of husked ears decreased with increased plant population. The proportion of ears over 150g decreased with increased plant population. However, total number and weight of marketable ears and gross income per 10a calculated considering weight and number of ears increased with plant population. There were highly positive correlations between gross income and ear number or ear weight per unit area. At high plant populations the number of marketable ears was overestimated but ear weight underestimated compared with gross income. Dry matter yield of stover increased with increased plant population and ranged 755-944kg/10a with 20.7-24.5% dry matter content. Rice black-streaked dwarf virus infection rate was 10.6-14.9%, but it was not related to plant population.

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Quality of Sweet Corn Stored at Different Temperatures and Duration (저장온도와 기간에 따른 단옥수수의 품질변화)

  • 이석순;이상직;김대연
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.32 no.2
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    • pp.137-143
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    • 1987

  • To find out the optimum storage temperature and duration, changes in the content of sugars and soluble solids and flavor rate of two sweet corn hybrids (Great Bell and Golden Cross Bantam) and a super sweet corn (Crisp Super Sweet 720) were observed after storing at -20, 0, 5, 10, 15, 20, and 25$^{\circ}C$ for 1,3,5, and 7 days. At the temperatures below 10$^{\circ}C$, contents of soluble solids and total sugars and flavor rate were not changed significantly, but at the temperatures higher than 15$^{\circ}C$ they decreased as storage temperatures increased and duration extended. Storage duration conserving flavor seems to be 7 days at temperatures below 10$^{\circ}C$, 3 days at 15$^{\circ}C$, and 1-2 days at 25$^{\circ}C$. When corn was frozen, flavor rate was a little low compared with corn stored at 0$^{\circ}C$ although sugar content was higher. Both soluble solids and total sugar contents were positively correlated with flavor rate of cooked corn.

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옥수수밭의 제초제 사용방법

  • 이석순
    • The Bimonthly Magazine for Agrochemicals and Plant Protection
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    • v.6 no.4
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    • pp.29-33
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    • 1985

  • 금년의 우리나라 옥수수 재배면적을 종자공급량으로 추정해보면 종실용과 사일레지용을 합하여 약 32,900 ha 이며 단옥수수가 약 4,000 ha 재배될 전망이다. 이렇게 옥수수가 새로운 환금작물로 대두됨에 따라 재배방법의 보급은 물론 특히 제초에 어려움을 느끼고 있다. 옥수수의 제초작업은 농민들의 제초제에 대한 인식과 지식의 부족으로 대부분 인력으로 수행되고 있는데 제초작업의 어려움과 최근에 더욱 심각해진 농업노동력의 부족, 노동임금의 상승 등을 고려하면 옥수수재배에서 제초제의 사용은 불가피하다.

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옥수수밭의 제초제 사용방법 <하>

  • 이석순
    • The Bimonthly Magazine for Agrochemicals and Plant Protection
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    • v.6 no.5
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    • pp.57-61
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    • 1985

  • 금년의 우리나라 옥수수 재배면적을 종자공급량으로 추정해보면 종실용과 사일레지용을 합하여 약 32,900 ha 이며 단옥수수가 약 4,000 ha 재배될 전망이다. 이렇게 옥수수가 새로운 환금작물로 대두됨에 따라 재배방법의 보급은 물론 특히 제초제에 어려움을 느끼고 있다. 옥수수의 제초작업은 농민들의 제초제에 대한 인식과 지식의 부족으로 대부분 인력으로 수행되고 있는데 제초작업의 어려움과 최근에 더욱 심각해진 농업노동력의 부족, 노동임금의 상승 등을 고려하면 옥수수재배에서 제초제의 사용은 불가피하다.

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