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http://dx.doi.org/10.5333/KGFS.2003.23.3.143

Effects of Phosphate Application Rate on Growth Characters, Forage Yield and Feed Value of Jeju Native Soybean  

조남기 (제주대학교)
강영길 (제주대학교)
송창길 (제주대학교)
윤상태 (제주대학교)
조영일 (서울대학교)
김동현 (제주대학교)
Publication Information
Journal of The Korean Society of Grassland and Forage Science / v.23, no.3, 2003 , pp. 143-150 More about this Journal
Abstract
This study was conducted to determine the response of main growth characters, yield and chemical composition of Jeju native soybean based on the difference between phosphate rates (0, 50, 100, 150, 200, 250kg/ha) from May 11 to September 10 in 2002 in Jeju island. Days to flowering was delayed from 92 days to 97 days as the increasing of phosphate rate. Also plant height grew longer from 109cm to 124cm. The number of branches and leaves, stem diameter, root length and weight of root grew powerful as phosphate rate increased from 0 to 250kg/ha. Fresh forage yield was 26.5MT/ha in the nonphosphate plot and then was 36.9MT/ha as phosphate rate increased to 250kg/ha. And the difference between 200kg/ha and 250kg/ha in phosphate rate was not significant. Dry matter, crude protein and TDN yield increased 6.0∼7.9MT/ha, 0.9∼1.4MT/ha and 3.4∼4.9MT/ha respectively, as the increasing of phosphate rate. Also crude protein, crude fat, NFE and TDN content increased 15.5∼18.3%, 2.2∼3.3%, 42.5∼43.5%, and 56.7∼61.9% respectively. In contrast with this, crude fiber and crude ash decreased 32.1∼28.1% and 7.7∼6.8% respectively. To reach the climax of forage yield was estimated optimum phosphate rate to be 200kg/ha.
Keywords
Jeju native soybean; Phosphate application rate; Forage yield; Feed value;
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