Effects of Varieties and Seeding Dates on the Yield Components, Protein and Oil Content in Soybean

품종 및 파종기이동이 대두의 수량형질과 단백질 및 유지함량에 미치는 영향

This experiment was conducted to study the effexts of seeding time and varieties on yield components, protein and oil content of soybean. Four varieties of soybean(Chung Buk Baek, Iksan, Keum doo, Chang dan Baek mok)wrere applied in this experiment and were seeded at May 15th, June 5th, and June 25th, the results obtained are as follows. 1.When the soybean was seeded at May 15th, stem height, stem diameter and number of nodes on main stem came to an end about 70days after seeding. In case that the seeding time was delayed 20 days and 40 days from May15th, respectively, the time to be almost cimpleted the growth of the characteristics was shortened 10days and 20days during ther debelopment. Among varieties, Chung Buk Beak grew faster than any other varieries. 2.When seeded at May 15th, the plants produced many pods, and had high proportion of branch pods. When seeded late, the proportion of branch pods were low. Branches had large proportion of empty pods and one grain pods, but on main stem, the proportion of two grain pods and three grain pods were more than that of branch. Among varieties, Chung Buk Baek had high proportion of two and three grain pods, Keum doo and Chang dan Baek mok had high proportion of one and two grain pods, and Iksan had high proportion of one and three grain pods. 3.Tields were less by the late seeding.The proportion if decreased yields to the yields when seeded at May 15th, that of Chung Buk Baek was decreased 6% when seeded at June 5th and 14% when seeded at June 25th, that of Ik san was decreased 9% and 17%, that of Keum doo decreased 15% and 26% and that of Chang dan Baek mik decreased 18% and 27%. 4.Protein content was highest in the plots seeded on May 15th, but oil content was highest in the plots seeded in June 25th. Among varietiesm Xhang dan Baek mok had the highest proportion of protein content and Iksan had the highest of oil content.

1. 경장 경경 주경절수는 5월 15일 파종에서 파종후 70일경에 거의 완성되었으며 파종시기가 20일 40일로 지연되므로서 완성에 이르는 시기가 10, 20일식 빨랐고 품종간에서는 충북백이 가장 빨랐다. 2. 협수는 5월 15일 파종에서 가장 많았고 분지협이 주경협보다 많았으며 6월 25일파에서는 주경협이 많았다. 분지협에서는 공협과 1입중간에서 충북백은 2,3입협율이 높았고 김두와 장단백일은 1,2입협율이 높았으며 익산은 1,3입협율이 높았다. 3. 주경절위별 착입수가 3-4절에서 가장 많았고 9-10절이 다음으로 많았다. 4. 만파에서는 수량이 떨어지며 5월 15일파에 비하여 6월 5일파와 6월 25일파의 감수율은 충북백 6% 14% 익산 9% 17% 김두 15% 26% 장단백일 18% 27%였다. 5. 단백질함량은 5월 15일 파종한 것이 가장 높았고 유지함량은 6월 25일 파종한 것이 높았으며 품종간에서 단백질은 장단백일이 유지는 익산이 가장 높았다.