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- 저자 : Ho Gyeong Chae(채호경) (검색결과 2 건)
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Ho Gyeong Chae(채호경),Ronley C. Canatoy,Hyeon-Ji Song,Snowie Jane C. Galgo,Ji Su Ha,So Yeong Park,Pil Joo Kim 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Plastic film mulching (PFM) has been widely proposed for developing crop productivity. It can control weed growth, reduce soil evaporation and improving soil temperature and moisture content. However, the improved soil environmental condition might increase the net primary production (NPP) as a C input source, as well as soil organic matter decomposition. Therefore, the effect of PFM on soil C stock change is still under discussion. To evaluate the effect of PFM on soil C stock changes, PFM and no-mulching were installed as main treatment, and chemical fertilizer and chemical fertilizer with urease inhibitor (NBPT) were placed as sub-treatment. In all treatments, stover as organic matter source was recycled at the harvesting stage for two years. PFM increased respired C loss compared to no-mulching due to improved soil temperature. However, PFM drastically enhanced maize biomass productivity by 98-118 and 88-95% in control and NBPT, respectively. After two years of stover incorporation, PFM significantly increased net ecosystem C budget (NECB) by 88-171 and 31-120%, in control and NBPT, respectively. Different with the general knowledge, which PFM boosts soil microbial activity and then decreased soil C stock, PFM was very effective to increase soil C stock under stover recycling condition, due to higher biomass productivity increase than mineralized C loss increase.
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Investigation of Total Nutrient Usage Amount in Korea Facility Cultivation Area
Ji Su Ha(하지수),So Yeong Park(박소영),Ho Gyeong Chae(채호경),Tae young Kim(김태영),Seul Bi Lee(이솔비),Chang Hoon Lee(이창훈),Ouk Kyu Han(한옥규),Gil Won Kim(김길원) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Korea facility cultivation area is continuously increased and the total cultivation area has reached 80,611 ha in 2020. Facility cultivation area have been put a large amount of nutrients to increase crop productivity under intensive cultivation. The input of excessive nutrients can reduce the growth of crops due to salt accumulation in soil, and accumulated nutrients probably make environmental pollution such as eutrophication, micro dust, and blue baby syndrome. In 2016, the soil EC data of the facility revealed that most of the facility cultivation soils exceeded the crop growth EC range (4dS/m). Therefore, we studied the amount of nutrient input of the facility cultivation area to understand how much nutrient were applied. The total nutrient (N, P₂O<SUB>5</SUB>, K₂O) input rates were investigated from 9 major provinces in facility cultivation area from research reports and published papers. Finally, the amount of excess nutrient input was calculated with total input amount minus the recommended fertilization amount based from soil test. Total nutrient inputs exceeded than recommended fertilization level by 60~640%, 70~700%, and 96~3600% for K₂O, N, and P₂O<SUB>5</SUB>, respectively. In addition, the cucumber and green peppers were applied the highest nutrient than other crops and Jeollanam-do showed highest nutrient input among the provinces which revealed that the huge amount of nutrients was applied in facility cultivation area. This will create a serious problems in soil and water ecosystems due to nutrient accumulation and leaching. Conclusively, we should apply recommended nutrient levels in facility cultivation for sustainable agriculture and environmental protection.
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