Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Growth and Yield Responses of Corn (Zea mays L.) as Affected by Growth Period and Irrigation Intensity

  • Nam, Hyo-Hoon (Crop Production & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Seo, Myung-Chul (Crop Production & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Cho, Hyun-Suk (Crop Production & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Lee, Yun-Ho (Crop Production & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Seo, Young-Jin (Bonghwa Herbal Crop Research Institute, Gyeongsangbuk-do Agricultural Research and Extension Services)
  • Received : 2017.10.16
  • Accepted : 2017.12.14
  • Published : 2017.12.31
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Abstract

The frequency and intensity of soil moisture stress associated with climate change has increasing, and the stability of field crop cultivation has decreasing. This experiment was conducted to investigate the effect of soil moisture management method on growth and yield of corn. Soil moisture was managed at the grade of WSM (wet soil moisture, 34.0~42.9%), OSM (optimum soil moisture, 27.8~34.0%), DSM (dry soil moisture, 20.3~27.8%), and ESM (extreme dry moisture, 16.6~20.3%) during V8 (8th leaf stage)-VT (tasseling stage). After VT, irrigation was limited. The treated amount of irrigation was 54.1, 47.7, 44.0 and 34.5% of total water requirement, respectively. The potential evapotranspiration during the growing period was $3.29mm\;day^{-1}$, and upward movement of soil water was estimated by the AFKAE 0.5 model in the order of ESM, DSM, OSM, and WSM. We could confirm this phenomenon from actual observations. There was no significant difference in leaf characteristics, dry matter, and primary productivity depending on the level of soil moisture, but leaf development was delayed and dry weight decreased in DSM. However, dry weight and individual productivity of DSM increased after irrigation withdrawal compared to that of OSM. In DSM, ear yield and number of kernels per ear decreased, but water use efficiency and harvest index were higher than other treatments. Therefore, it is considered that the soil moisture is concentratedly managed before the V8 period, the V8-VT period is controlled within the range of 100 to 500 kPa (20.3~27.8%), and no additional irrigation is required after the VT.

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References

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