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연구보문 : 유색찰옥수수의 상품화율 향상을 위한 적정재식밀도 및 수확시기
이유영 ( Yu Young Lee ),김충국 ( Chung Guk Kim ),정태욱 ( Tae Wook Jung ),이춘기 ( Choon Ki Lee ),김욱한 ( Wook Han Kim ),김성국 ( Sung Kook Kim ) 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.1
This study was carried out to find out optimum plant density and harvest time to increase the marketing value of waxy corn hybrid with colored pericarp. Two waxy corn hybrids, "Eolrukchal 1" of bi-color and "Heukjinjuchal" of black color, were developed at 2007, 2008 in National Institute Crop Science, respectively. Generally colored waxy corn has problems of longer maturing period and shorter total ear length (TEL) and filled ear length ratio (FELR) than those of white waxy corn. It is important to increase the marketing value of colored waxy corns. TEL, ear diameter, FELR, and weight of ear(g/ear) were increased as plant density decreased. The optimum plant density for ear of good quality was 4,100~4,700 (plants/10a) for waxy corn hybrid, "Eolrukchal 1" and "Heukjinjuchal". The characteristics and yield of ear were not distinguished but color of ear showed distinct change in "Eolrukchal 1" and "Heukjinjuchal" at harvest time as days after silking.
조영손 ( Young Son Cho ),이병진 ( Byeong Jin Lee ),손다니엘 ( Daniel Son ),윤영환 ( Young Hwan Yoon ),양원하 ( Won Ha Yang ),서종호 ( Jong Ho Seo ),김충국 ( Chung Kook Kim ),손범영 ( Beom Young Son ) 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.4
Under field conditions, 22 corn hybrids(CHs) were tested for several characteristics related to lodging resistance and excessive water stress, such as pushing resistance on 1.0 and 1.5 m hights of the corns and breaking point. The 22 corn CHs were selected because they showed strongest pushing resistance and breaking resistance of culm as well as the highest thickness of basal culm, leaf greenness, leaf area, and plant height based on two pre-pot experiments performed in phytotron. To make excess water condition, water irrigation was done at 1) 20-d after seeding, 2) 5th leaf stage, 3) tasseling stage, and 4) silking stage with 100 mm/day for 5 days. Lodging-related characteristics were measured: culm diameter, root dry weight, weight balance of above-ground plant, breaking resistance, and breaking height in field experiment. Among all the characteristics tested, we explained in the two critical points for lodging resistance: 1) breaking resistance and breaking point, 2) culm diameter with breaking resistance and breaking point, and they were further evaluated for the relationships with the 1.0 and 1.5m height of above-ground plant. In the corn hybrids, there was a positive correlation between breaking resistant and weight balance of corn at the silking stage water treatment at 1.0 and 1.5-m height. And breaking resistant and culm diameter had a positive relationship at the 20-d water treatment at both measuring height. In conclusion, selection for lodging resistant hybrids or germplasms to excess soilwater should be made at the 5th leaf stage water treatment, and basal culm thickness should be considered to evaluate the resistance of the corn hybrid plants to lodging.