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http://dx.doi.org/10.5532/KJAFM.2018.20.2.190

Assessment of the Safe Rice Cropping Period Based on Temperature Data in Different Regions of North Korea  

Yang, Woonho (Crop Cultivation and Environment Research Division, National Institute of Crop Science, Rural Development Administration)
Kang, Shingu (Crop Cultivation and Environment Research Division, National Institute of Crop Science, Rural Development Administration)
Kim, Sukjin (Crop Cultivation and Environment Research Division, National Institute of Crop Science, Rural Development Administration)
Choi, Jong-Seo (Crop Cultivation and Environment Research Division, National Institute of Crop Science, Rural Development Administration)
Park, Jeong-Hwa (Crop Cultivation and Environment Research Division, National Institute of Crop Science, Rural Development Administration)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.20, no.2, 2018 , pp. 190-204 More about this Journal
Abstract
The probability of safe cropping and the major phenological stages in rice were assessed using daily mean temperature data from 1981 to 2016 at 27 sites in North Korea. The threshold temperatures for early marginal transplanting date (EMTD), marginal harvesting date (MHVD), safe marginal heading date (SMHD), and cumulative temperature-based heading date (CTHD) were set to be $14^{\circ}C$, $13^{\circ}C$, $22^{\circ}C$ for 40 days after heading, and cumulative temperature of $1200^{\circ}C$ to MHVD, respectively. The safe heading date (SHD) was assumed to be either SMHD or CTHD whichever was earlier. It was also assumed that the minimum requirement for the suitability of safe rice cropping was met when both SMHD and CTHD appeared along with the time period of 60 days or more from EMTD to SHD. It was analyzed that 17 sites (Kaesong, Haeju, Yongyon, Singye, Sariwon, Nampo, Pyongyang, Anju, Kusong, Sinuiju, Changjon, Wonsan, Hamhung, Pyonggang, Huichon, Supung, Kanggye) had 90% or higher probability, two sites (Yangdok, Sinpo) had 80-90% probability, and eight sites (Kimchaek, Chunggang, Chongjin, Sonbong, Changjin, Pungsan, Hyesan, Samjiyon) had less than 80% probability of the safe rice cropping. For each region, the representative EMTD, SHD, and MHVD were analyzed using the 80 percentile of total years tested. The ranges for EMTD, SHD, and MHVD were May 4 in Sariwon~May 24 in Sinpo, June 21 in Kanggye~August 11 in Haeju, and September 17 in Kanggye~October 16 in Haeju and Changjon, respectively. Time durations from EMTD to SHD and from SHD to MHVD were 67~97 days and 57~72 days, respectively, depending on the regions. This study would facilitate modeling efforts for rice yield simulation in future studies. Our results would also provide basic information for practical researches on the rice cropping system in North Korea.
Keywords
Early marginal transplanting date; Marginal harvesting date; North Korea; Rice cropping period; Safe heading date; Temperature;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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