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牛糞과 窒素質 肥料 追肥水準에 따른 Italian ryegrass의 窒酸態 窒素 蓄積
姜泰鐘,許三男 全北大學校 附設 畜産開發硏究所 1991 畜産開發硏究報告 Vol.4 No.-
This study was conducted to investigate the influence of the level of cattle manure and nitrogen fertilization and cutting date on the nitrate accumulation in Italian ryegrass. Various nitrogen fertilizers(0, 10, 20㎏/10a) and cattle manure(0, 1, 2t/10a) were applied to Italian ryegrass and the experiment was performed at the field of Chonbuk National University in Chonju, from 1989 to 1990. The results obtained are summarized as follows ; 1) Significant difference were observed in nitrate concentration in Italian ryegrass as the levels of nitrogen fertilizers and cattle manure were increased(P<0.05). 2) Nitrate nitrogen contents were highest in 20㎏/10a of KNO3 plot shortly after 1st fertilization, but nitrate contents were very low in all treatments after the 2nd top dressing. 3) Nitrate contents in all treatments were dangerous to the livestock until 33days after 1st top dressing, but the contents were decreased to the safe level after 44days of the 1st top dressing. 4) The plots top-dressed with cattle manure kept very high in nitrate contents over 0.45%, dangerors level to the livestock throughout the experiment period. 5) Total nitrogen contents were the similar tendency to the nitrate content and the plots dressed with cattle manure were more or less 2% in nitrogen content. 6) Total DM yields were increased as the nitrogen fertilization were increased with highest yield in KNO_3, 20㎏/10a plot(1,249㎏/10a) and lowest in the plot of cattle manure(779㎏/10a).
강태종,민은비,허겸,신현옥,황두진 한국수산해양기술학회(구 한국어업기술학회) 2022 수산해양기술연구 Vol.58 No.2
As a method to understand the ecological habits around the artificial reef, various reports such as fishing gear survey, diving, sound survey, underwater CCTV and camera, etc. are reported. Among them, the sound survey method is carried out by installing an acoustic system on the ship and can be investigated regardless of the marine environment such as time constraints and turbidity. Such method, however, takes a lot of manpower and time as the ship travels at a constant speed. Investigations around artificial reefs are being conducted in an artificial way, and a lot of time and labor are consumed as such. Maritime buoys have been operated for various purposes such as route signs, weather observation, marine environment monitoring and defense monitoring for navigation safety in the past, but studies on monitoring systems for ecological habits and distribution of fish using marine buoys are remarkably insufficient. Therefore, this study aims to develop a system that allows users to directly monitor fish group detector data by estimating the distribution of fish groups around artificial reefs and using wireless communication at sea. In order to confirm the suitability of the maritime buoy used in this study, it was operated to compare data using LTE-equipped buoys capable of wireless communication and a data logger-type system buoy. Data transmission of buoys capable of LTE communication was carried out in a 10-minute ON, 10-minute OFF method due to the limitation of the power supply capacity, and data of the data logger-type buoy received full data. We compared and analyzed the data received from the two fish detectors. It is expected that real-time monitoring of the wireless buoy detection device using LTE will be possible through future research.