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RISS 인기검색어
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- 저자 : Hyeok Gong(공동혁) (검색결과 3 건)
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Yearly Characterization of Soil Properties from Soybean Cultivation at Paddy Fields
Hyen Chung Chun(전현정),Sanghun Lee(이상훈),Hyeok Gong(공동혁),Ki Youl Jung(정기열) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Soybean(Glycine max (L) Merr.) cultivation from paddy fields has many benefits such as increase in yields, etc. However there have been found problems such as increase in desease and decrease in yields from contiguous soybean cultivation at paddy fields. This study investigated soil physical and chemical properties from paddy field soils by different soybean cultivation years; 1~3 year, 4~6 year and over 10 year. Ten sites from each year category were selected in Andong, Kyeongbuk and Gimje, Jeonbuk area in Korea. Soybean is only crop cultivated in all 30 sites and standard chemical fertilizer and manure were applied every year. Soil samples were taken during Mach and April before soybean planting in 2021. All samples were analyzed for physical properties such as soil texture, bulk density and soil moisture content and chemical properties such as pH, CEC, Available P₂O<SUB>5</SUB>, NO₃, etc. Statistical analyses were performed in SPSS(Statistical Package for the Social Science) at 95% siginificant level. Results of physical analyses did not show significant different as cultivation period increase, however chemical properties showed difference across different cultivation period. Values of NH₄ and NO₃ from over 10 year sites were significantly smaller than ones from less than 6 year sites. On the other hand, phosphate related properties, such as available P₂O<SUB>5</SUB> and organophosphoric acid, increased as soybean cultivation period increased. Paddy fields converted to soybean cultivation from rice under 3 years showed relatively great nitrogen and small phosphate values. These results may related to rice cultivation condition such as flooded condition. Nitrogen contents tend to decrease and phosphate contents to increase as soybean cultivation continues. This may be resulted in continuous application of fertilizer and manure to soil. Thsese results indicated that continuous cultivation of soybean in paddy fields may benefit for yield increase, but this benefit decrease under increase of cultivation period without manage chemical properties in soils.
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Hyen Chung Chun(전현정),Sanghun Lee(이상훈),Hyeok Gong(공동혁),Ki Youl Jung(정기열) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Application of chemical fertilizer and manure to Soybean(Glycine max (L) Merr.) cultivation from paddy fields can cause degeneration in soil fertility and environmental pollution. In order to improve soil fertility with less fertilizer and manure, it is important to understand effects of fertilizer and manure in soybean cultivation from paddy fields. In this study, three paddy field sites were converted to upland by soybean cultivation located at Miryang in 2018. A chemical fertilizer and manure treatment were applied to one site (Chem+Manu), only chemical fertilzer treatment was applied to another site (Chem) and no fertilizer and manure to the third site (no treatment). Soybean has been cultivated in all three sties with three treatments every year. In order to compare upland soils with soybean cultivation, an upland field with continuous soybean cultivation with fertilizer and manure was selected as a upland soil site. All soil samples were taken during Mach and April before soybean planting in 2021. The sites with manure application had the same manure and this manure was also analyzed. All samples were analyzed for physical properties such as soil texture, bulk density and soil moisture content and chemical properties such as pH, CEC, Available P₂O<SUB>5</SUB>, NO₃, etc. All sites had the same soil texture as sitl loam. Statistical analyses were performed in SPSS(Statistical Package for the Social Science) at 95% significant level. Application of fertilizer and manure showed significantly different chemical and physical properties. Values of EC, organic matter content, organic carbon, and CEC were greater from the Chem+Manu soil than other soils. Soils from No treatment and Chem sites had no difference in soil properties. Meanwhile, NO₃ and NH₄ values were greater from all paddy field soils and smaller pH than the upland soil. Application of manure increased soil moisture content in soil, while the upland soil had the smallest soil moisture content and greatest bulk density. The upland soil site also had fertilizer and manure application similar to Chem+Manu site. But soil drainage level may cause these different physical property results. As a conclusion, application of fertilizer and manure will affect quality of soil and it is important manage quantitity of both application.
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