• Title/Summary/Keyword: soybean soil

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Alkaline protease of Actinomycetes CS0703 : Isolation, production and characterization

  • Kim, Joon-Ho;Yoo, Jin-Cheol
    • Proceedings of the PSK Conference
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    • 2002.10a
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    • pp.331.1-331.1
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    • 2002

  • Actinomycetes CS0703 has been isolated in soil sample from location in the Jeju province. Korea. and produces alkaline extracellular proteases. To maximize protease production, initial pH of the culture medium was adjusted to 12.0 with NaOH and incubated at $48^{\circ}C$ on a rotary shaking incubator(180rpm). Actinomycetes CS0703 produced high level of protease at late exponential phase when grown in OSYM medium (oatmeal 2.0%. soybean meal 1%. dried yeast 1%. mannitol 1%). (omitted)

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Analysis of Irrigation Water Amount Variability based on Crops and Soil Physical Properties Using the IWMM Model (IWMM 모형을 이용한 작물과 토양의 물리적 특성에 따른 관개용수량 변동 특성 분석)

  • Shin, Yongchu
    • Journal of The Korean Society of Agricultural Engineers
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    • v.59 no.2
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    • pp.37-47
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    • 2017

  • In this study, we analyzed the variability of irrigation water amounts based on the combination of various crops and soil textures using the Irrigation Water Management Model (IWMM). IWMM evaluates the degree of agricultural drought using the Soil Moisture Deficit Index (SMDI). When crops are damaged by the water scarcity under the drought condition indicating that the SMDI values are in negative (SMDI<0), IWMM irrigates appropriate water amounts that can shift the negative SMDI values to "0" to crop fields. To test the IWMM model, we selected the Bandong-ri (BDR) and Jucheon (JC) sites in Gangwon-do and Jeollabuk-do provinces. We derived the soil hydraulic properties using the near-surface data assimilation scheme form the Time Domain Reflectrometry (TDR)-based soil moisture measurements. The daily root zone soil moisture dynamics (R: 0.792/0.588 and RMSE: 0.013/0.018 for BDR/JC) estimated by the derived soil parameters were matched well with the TDR-based measurements for validation. During the long-term (2001~2015) period, IWMM irrigated the minimum water amounts to crop fields, while there were no irrigation events during the rainy days. Also, Sandy Loam (SL) and Silt (Si) soils require more irrigation water amounts than others, while the irrigation water were higher in the order of radish, wheat, soybean, and potato, respectively. Thus, the IWMM model can provide efficient irrigation water amounts to crop fields and be useful for regions at where limited water resources are available.

  • https://doi.org/10.5389/KSAE.2017.59.2.037 인용 PDF KSCI

Identification of a Proper Phytoavailable Arsenic Extraction Method Associated with Arsenic Concentration in Edible Part of three Crops in Soils Near Abandoned Mining Areas

  • Yoon, Jung-Hwan;Kim, Young-Nam;Lee, Dan-Bi;Kim, Kwon-Rae;Kim, Won-Il;Kim, Kye-Hoon
    • Korean Journal of Soil Science and Fertilizer
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    • v.50 no.6
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    • pp.497-508
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    • 2017

  • This study aimed to investigate correlations between concentrations of extractable Arsenic (As) with varying chemical solutions (0.1 M $Ca(NO_3)_2$, 0.1 M $(NH_4)2HPO_4$, 0.5 M EDTA, Mehlich 3, and 0.5 M $NaHCO_3$) and those of As in crops, and then to seek the most suitable soil extraction method for predicting the potential of As uptake in crops cultivated in soils contaminated with As. For a mesocosm experiment, pepper (Capsicum annuum L.), soybean (Glycine max L.), and rice (Oryza sativa L.) were cultivated for three months in pots containing soils taken from the arable areas near abandoned mines in Korea. Following the cultivation, soil pH and DOC significantly increased by treatments of lime and lime plus compost, respectively, while insignificant influences in changing total and all extractable As concentrations were found in all soils. Arsenic concentration in edible part of all crops considerably depended on the extractable As concentration in the soils, particularly with Mehlich 3. All extractable As concentrations in the soils of C. annuum and G. max were significantly correlated with As concentration in their edible parts. For O. sativa, the extractable concentrations of Mehlich 3 ($R^2$: 0.18 at p: 0.006) and EDTA ($R^2$: 0.11 at p: 0.036) showed only marked relationships with As concentration in the edible part. These results may indicate that the Mehlich 3 and EDTA are soil extractants to determine phytoavailable As in soil that provide better prediction for As transfer from soil to crop.

  • https://doi.org/10.7745/KJSSF.2017.50.6.497 인용 PDF KSCI