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Utilization of Fly Ash as a Source of Mineral Fertilizers -IV. Development of Slowly Released K Fertilizer (Fly Ash 비료화(肥料化) 연구(硏究) -IV. Fly Ash를 이용(利用)한 지효성(遲效性) 가리(加里) 비료(肥料) 개발(開發))

Shin, Jae-Sung;Seong, Ki-Seog;Choi, Du-Hoi
- Korean Journal of Soil Science and Fertilizer
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- v.27 no.1
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- pp.10-14
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- 1994
The slowly released potassium fertilizer was developed by mixing fly ash with KOH, anthracite coal powder, KCI, $K_2CO_3$ and $Mg(OH)_2$ as the substances for accelerating calcination. Measuring proper ratios of raw materials, we found that the anthracite coal powder was 12 percent and $Mg(OH)_2$ was two to three percent. The optimal calcination temperature and time were proved to be $850^{\circ}C$ and 30 minutes, respectively, however, the trial product with lower temperature and shorter time in calcination had low quality. The K solubility of the product was very low compared to that of the KCl fertilizer.
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The study of Haseo Kim-Inhoo's (하서(河西) 김인후(金麟厚)의 <효부(孝賦)>에 대한 고찰)

Cho, Keyoung
- (The)Study of the Eastern Classic
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- no.41
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- pp.149-185
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- 2010
This study consider the literary capacity and the pursuit of learning through the Haseo Kim In-hoo's a literary work. A prose poem's is composed of of six item. It is study the origin and the root of a man, the teachings of humanity and filial conduct, a meaning of learning and filial piety, the procedure and system method of learning, a rule of learning and dutiful service to one's parents, an epilog. The origin and the root of a man is founded on dutiful to thoughtful about one's parents. The teachings of humanity and filial conduct is based upon dutiful devoted to one's parents. A meaning of learning and filial piety accord with true learning and loving and respecting. The procedure and system method of learning is closely following in the teachings of Confucius and Mencius and Juja. A rule of learning and dutiful service to one's parents attaches too much importance to devotion to one's studies and substantial filial piety.

The Effect of Compound Fertilizer Contained Slow Release Nitrogen on Turfgrass Growth in Creeping Bentgrasss and on Change in Soil Nitrogen (완효성 질소 비료의 시비가 크리핑 벤트그래스 생장과 토양 중 질소변화에 미치는 영향)

Kim, Young-Sun;Kim, Tack-Soo;Ham, Suon-Kyu;Ban, Su-Won;Lee, Chang-Eun
- Asian Journal of Turfgrass Science
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- v.23 no.1
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- pp.111-122
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- 2009
Compound fertilizer contained slow release nitrogen was used at golf course management because of promoting turfgrass growth and decreasing fertilizing labor. But, it was hardly published about turf grass growth by its effect and form like isobutylidene diurea(IBDU) and methylene urea(MU) in golf course management of Korea. This study was conducted to investigate the effect of compound fertilizer contained slow release nitrogen such as IBDU and MU on creeping bentgrasss and the change in nitrogen in the root zone after application of fertilizers at AM turfgrass research institute with soil analysis, chlorophyll content index, leaf area index and dry weight during 5 months from July to december in 2007 year. Fertilizer treatments were designed as following; non-fertilizer(NF), straight fertilizer(CF), treatment 1(MU), treatment 2(IBDU 1), and treatment 3(IBDU 2). The every treatments were arranged a randomized complete block design with three replications. Results obtained were summarized as follows: As relative to time after N fertilizers application, ammonium and nitrate in soil were increased, but T-N was decrease. $NO_3$-N and T-N content of slow release fertilizer(SRF), the treatment MU, IBDU 1 and IBDU 2, in soil was higher than that of CF, and the change of ratio of available N and T-N by elapsed time after fertilizing SRFs and CF was higher about 5% in root zone of SF to l5days, but in root zone of SRF from 30days about $5{\sim}10%$. Compared with NF, the turf color index was increased 6.5%, 6.7%, 5.9% and 5.5%, respectively, the chlorophyll content 33.2%, 38.4%, 35.1% and 37.1%, the dry weight 76.2%, 77.7%, 69.5 and 72.3% and shoot number 28%, 52%, 56% and 51%. The chlorophyll content index of MD, IBDU 1 and IBDU 2 was increased $2.6{\sim}5.2%$ than that of CF, shoot number $18{\sim}22%$ but turf color index and dry weight was analogous to that of CF. These results showed that the SRF application was supplied nitrogen for a long time in root zone by increasing an available nitrogen, and so bring turf growth such as chlorophyll content and shoot number in creeping bentgrass.
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