KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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The Effect of Nitrogen Rates on The Growth and Yield of Maize in Agricultural Fields with the Stream

하천변 농경지에서 질소 시비량 차이가 옥수수 생육 및 수량에 미치는 영향

  • Lim, Jung Taek (College of Agricultural and Life Sciences, Chungnam National University) ;
  • Chang, Jae-Hyuk (College of Agricultural and Life Sciences, Chungnam National University) ;
  • Rho, Ye-Jin (College of Agricultural and Life Sciences, Chungnam National University) ;
  • Ryu, Jin-Hee (National Institute of Crop Science, RDA) ;
  • Chung, Dong Young (College of Agricultural and Life Sciences, Chungnam National University) ;
  • Cho, Jin-Woong (College of Agricultural and Life Sciences, Chungnam National University)
  • 임정택 (충남대학교 농업생명과학대학) ;
  • 장재혁 (충남대학교 농업생명과학대학) ;
  • 노예진 (충남대학교 농업생명과학대학) ;
  • 류진희 (국립식량과학원) ;
  • 정덕영 (충남대학교 농업생명과학대학) ;
  • 조진웅 (충남대학교 농업생명과학대학)
  • Received : 2013.12.08
  • Accepted : 2014.02.21
  • Published : 2014.03.30
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Abstract

This study was conducted to investigate the effect of nitrogen rates on the growth characteristics and yield of maize in agricultural fields with the stream. This indicates the necessity and optimal level of nitrous fertilization to examine the possibilities of quantity enhancement. Plant height and ear height of maize were not significantly different among the nitrogen rates. Stem diameter and leaf area index increased in the nitrogen treatment compared to untreated control. Changes of photosynthetic rate in maize leaves depending on nitrogen treatments increased as much as nitrogen rates were increased up to the highest level, 36 kg per 10a. NDF and ADF content levels of maize were investigated with different nitrogen rates regardless of treatments. In the case of NDF, it showed a tendency to decrease after 8 days of tasseling date. ADF had also decreased after 15 days of tasseling date. Nitrogen uptake of maize leaves with different nitrogen rates showed the highest level, $4.9g\;kg^{-1}$ with 36 kg per 10a on the tasseling date. Ear length and 100-kernel weight, there were no significant differences according to yield and the components with different nitrogen rates. Ear diameter and kernel number, nitrogen rates of 18 kg and 36 kg were increased compared to nitrogen rate of 9 kg per 10a and untreated control. The pericarps in 9 kg nitrogen rate and control were thicker than those of 18 kg and 36 kg treatment. The yield, 18 kg, 36 kg, and 9 kg treatments were increased by 10.96%, 9.27%, and 3.31%, compared to control. The component analysis on maize kernel with different nitrogen rates, starch showed no significant differences among treatments. Total sugar in 18 kg nitrogen treatment represented the highest content level, 6.37%. In addition, Amylopectin in 18 kg treatment showed the highest content level of 90.38%. However, amylose in 18 kg treatment showed the lowest level, 9.62% which drew a conclusion that waxy of 18 kg treatment is considered to be the strongest one. From the results described above, nitrous fertilization is essential to grow maize in agricultural fields with the stream. The optimum level of nitrous fertilization is considered 18 kg per 10a.

본 연구는 하천변 농경지에서 질소시비수준에 따른 옥수수의 생육특성과 수량성을 살펴보고 광합성 측정과 성분 분석을 통해 질소가 미치는 영향을 구명하여 하천변 농경지 재배에서 질소 시비의 필요성과 적정 질소 시비를 통한 수량 증대의 가능성을 검토하기 위하여 수행하였다. 질소 처리에 따른 옥수수 생육특성은 초장과 착수고의 경우 질소 시비량에 의한 큰 차이가 없었다. 광합성은 질소 시비량이 증가할수록 증가하여 36 kg 처리구에서 가장 높았다. 옥수수의 NDF와 ADF 함량은 처리구간 차이 없었으며 NDF는 출웅 후 8일 이후 감소하였으며, ADF는 출웅 후 15일 이후 감소하였다. 옥수수 잎의 질소 흡수량은 출웅기에 36 kg 처리구에서 가장 높았다. 수량 및 수량구성요소는 이삭길이와 100립중의 경우 처리구간 유의차가 없었으나 이삭직경과립수의 경우 무처리구와 9 kg 처리구에 비하여 18 kg 처리구와 36 kg 처리구에서 증가하였고, 과피는 18 kg 처리구와 36 kg 처리구에 비하여 무처리구와 9 kg 처리구에서 두꺼웠고, 수량은 무처리구에 비하여 18 kg 처리구, 36 kg 처리구, 9 kg 처리구가 많았다. 옥수수 종실의 전분함량은 처리구간 유의차가 없었으며, 총당은 18 kg 처리구가 가장 높았고 아밀로펙틴은 18 kg 처리구에서 가장 높았으나 아밀로오스는 18 kg 처리구에서 가장 낮아 18 kg 처리구에서 찰성이 가장 강하였다. 이상의 결과로 하천변 농경지에서 옥수수 재배시 질소시비가 필요하며 가장 이상적인 질소 시비량은 10a당 18 kg 정도로 판단된다.

Keywords

References

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