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http://dx.doi.org/10.7740/kjcs.2019.64.3.269

Determination of Adaptable Sowing Dates of Waxy Corn Using Growing Degree Days in the Central Northern Area of Korea  

Shim, Kang Bo (Department of Central Area Crop Science, National Institute of Crop Science, RDA)
Lee, Jong Ki (Department of Central Area Crop Science, National Institute of Crop Science, RDA)
Koo, Bon Il (Department of Central Area Crop Science, National Institute of Crop Science, RDA)
Shin, Myoung Na (Department of Central Area Crop Science, National Institute of Crop Science, RDA)
Yoon, Sung Tak (Department of Crop Science & Biotechnology, College of Life & Resources Science, Dankook University)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.64, no.3, 2019 , pp. 269-277 More about this Journal
Abstract
It is important to determine sowing date as it decisively affects the quality as well as quantity of waxy corn. In the central northern area of Korea, optimum sowing date of waxy corn is May and requires about 20-26 reproductive growth days from silking date to harvest. We determined adaptable sowing date of waxy corn varieties using growing degree days (GDDs), especially in the central northern area. Earlier sowing required many more emergence days owing to the low temperature. All waxy corn varieties required about 16~22 emergence days when sown in April. Otherwise, less than 15 emergence days were needed for sowing from May to August. Sowing dates to maximize ear yield of waxy corns were different depending on the eco-types of corn varieties as well as GDDs during the growth period. Early maturity type Mibaek2' showed the highest ear yield at the May $15^{th}$ sowing date. Middle maturity 'Iimichal' and late maturity 'Chalok4' showed the highest ear yield at the May $25^{th}$ and June $5^{th}$ sowing dates, respectively. GDDs of 26 days after silking was an index to determine the highest yield sowing date of 'Mibaek2'. The total GDDs from sowing to harvest and to silking were other indexes to determine the highest yield sowing date of 'Ilmichal' and 'Chalok4', respectively. Generally, it required about $2,400^{\circ}C$ GDDs from sowing date to maturity and at least 65 days of silking date from sowing to obtain about 1,200kg of ear yield of waxy corn in the central northern area of the Korean peninsula. The results of the study will be helpful for corn farmhouses to determine optimum sowing date of waxy corn in the central northern area of Korea.
Keywords
adaptable sowing date; central northern area; growing degree days; waxy corn;
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