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추파대맥 (秋播大麥) 재배시 기비로 (基肥) 시용한 (施用) 요소의 (尿素) 질산화 및 그에 따른 질산태질소의 (窒酸態窒素) 환경에의 방출
김석동,소창호,권용웅,임웅규 ( Sok Dong Kim,Chang Ho Soh,Yong Woong Kwon,Ung Kyu Lim ) 한국환경농학회 1993 한국환경농학회지 Vol.12 No.2
The use of fertilizer N is essential for maximum economic yield of crops. Meanwhile, enrichment of NO₃^-in the environment has to be avoided. Winter barley crop has a short duration of growth before winter, but is used to receive N greater than 60 ㎏/㏊ at seeding. Experiments were performed to determine the quantitative aspect of the fate of soil applied urea N among the residual, leached, and uptaken by winter barley (cv. Olbori), and to evaluate the effect of soil temperature on nitrification. Four levels of urea (0, 40, 80, and 120 ㎏ N/ha) was basal-dressed to Olbori. NH₄^- appeared dominant in the soil until 40 days after seeding, whereas NO₃^- did thereafter. Nitrification rate at 5°C of soil temperature was 40 to 50% of that at 15 ℃. Linear increases in the number of ammonia oxidizing and nitrite oxidizing bacteria of the soil was present as the level of urea fertilization was higher. Less than 60% of N applied at seeding was uptaken by winter barley until mid-March but 50% was lost from death of older barley leaves during overwintering. Thereby only 10% of the applied N remained in the barley in spring. Only 15% of the applied N was present in the rhizosphere. The 17 to 20% of the soil applied N leached out as NO₃^- the rhizosphere. Nitrogen leaching during winter was estimated to be 16 and 20 ㎏/㏊ when the basal application level of urea fertilization was 80 and 120 ㎏/㏊, respectively.
이정일(Jung Il Lee),박장환(Jang Hwan Park),김석동(Sok Dong Kim),안병옥(Byeong Ok Ahn),이승택(Seung Tack Lee) 한국약용작물학회 1993 한국약용작물학회지 Vol.1 No.1
This study was conducted to select thin-shelled and high-yielding lines in job`s-tears. Two breeding lines of Suwon 3 and Suwon 6 were selected from the local collections. These two lines were tested and investigated on their characteristics under the field condition. The heading date of Suwon 3 and Suwon 6 was later one or two days, but the maturity date was one or two days earlier than that of check variety Kim-jejong, respectively. The number of grains per hill of Suwon 3, Suwon 6 was 50%, 49% greater and the milling rate was 3.8%, 5.6% higher than that of check variety, respectively. Althought 1000 grain weight of Suwon 3 and Suwon 6 was 20g lighter and the rate of ripeness was 6%, 12% lower, the raw grain yield was 22%, 20% higher than that of check variety, respectively. The thickness of seed coat of Suwon 3 and Suwon 6 was thiner and the hardness of seed coat was lower than that of check variety, therefore the milling time was decreased 12%, 7% compare to check variety, respectively. The crude protein contents of Suwon 3 and Suwon 6 was slightly higher and the amino acid composition of Suwon 6 was similar to Kimjejong, but Suwon 3 was lower than that of check variety.