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Detecting Long-Term Dry Matter Yield Trend of Sorghum-Sudangrass Hybrid and Climatic Factors Using Time Series Analysis in the Republic of Korea

Author

Listed:
  • Befekadu Chemere

    (College of Animal life Sciences, Kangwon National University, Chuncheon 24341, Korea)

  • Jiyung Kim

    (College of Animal life Sciences, Kangwon National University, Chuncheon 24341, Korea)

  • Baehun Lee

    (College of Animal life Sciences, Kangwon National University, Chuncheon 24341, Korea)

  • Moonju Kim

    (Institute of Animal Resources, Kangwon National University, Chuncheon 24341, Korea)

  • Byongwan Kim

    (College of Animal life Sciences, Kangwon National University, Chuncheon 24341, Korea)

  • Kyungil Sung

    (College of Animal life Sciences, Kangwon National University, Chuncheon 24341, Korea)

Abstract

Despite the gradual increase in livestock feed demands, the supply faces enormous challenges due to extreme climatic conditions. As the presence of these climatic condition has the potential to affect the yield of sorghum-sudangrass hybrid (SSH), understanding the yield variation in relation to the climatic conditions provides the ability to come up with proper mitigation strategies. This study was designed to detect the effect of climatic factors on the long-term dry matter yield (DMY) trend of SSH using time series analysis in the Republic of Korea. The collected data consisted of DMY, seeding-harvesting dates, the location where the cultivation took place, cultivars, and climatic factors related to cultivation of SSH. Based on the assumption of normality, the final data set ( n = 420) was generated after outliers had been removed using Box-plot analysis. To evaluate the seasonality of DMY, an augmented Dickey Fuller (ADF) test and a correlogram of Autocorrelation Function (ACF) were used. Prior to detecting the effect of climatic factors on the DMY trend, the Autoregressive Integrated Moving Average (ARIMA) model was fitted to non-seasonal DMY series, and ARIMA (2, 1, 1) was found to be the optimal model to describe the long-term DMY trend of SSH. ARIMA with climatic factors (ARIMAX) detected significance ( p < 0.05) of Seeding-Harvesting Precipitation Amount (SHPA) and Seeding-Harvesting Accumulated Temperature (SHAMT) on DMY trend. This does not mean that the average temperature and duration of exposure to sunshine do not affect the growth and development of SSH. The result underlines the impact of the precipitation model as a major factor for the seasonality of long-term DMY of SSH in the Republic of Korea.

Suggested Citation

  • Befekadu Chemere & Jiyung Kim & Baehun Lee & Moonju Kim & Byongwan Kim & Kyungil Sung, 2018. "Detecting Long-Term Dry Matter Yield Trend of Sorghum-Sudangrass Hybrid and Climatic Factors Using Time Series Analysis in the Republic of Korea," Agriculture, MDPI, vol. 8(12), pages 1-10, December.
    • Handle: RePEc:gam:jagris:v:8:y:2018:i:12:p:197-:d:189697
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    References listed on IDEAS

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    1. MacKinnon, James G, 1996. "Numerical Distribution Functions for Unit Root and Cointegration Tests," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 11(6), pages 601-618, Nov.-Dec..
    2. Chan, Wai-Sum, 1999. "A comparison of some of pattern identification methods for order determination of mixed ARMA models," Statistics & Probability Letters, Elsevier, vol. 42(1), pages 69-79, March.
    3. Nam, Won-Ho & Hayes, Michael J. & Svoboda, Mark D. & Tadesse, Tsegaye & Wilhite, Donald A., 2015. "Drought hazard assessment in the context of climate change for South Korea," Agricultural Water Management, Elsevier, vol. 160(C), pages 106-117.
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    1. Moonju Kim & Befekadu Chemere & Kyungil Sung, 2019. "Effect of Heavy Rainfall Events on the Dry Matter Yield Trend of Whole Crop Maize ( Zea mays L.)," Agriculture, MDPI, vol. 9(4), pages 1-11, April.

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