• 제목/요약/키워드: Greenhouse soil

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유기농 시설채소 재배지 토양의 물리적 특성변화 (Physical Properties of Organic Vegetable Cultivation Soils under Plastic Greenhouse)

  • 이상범;최원아;홍승길;박광래;이초롱;김석철;안민실
    • 한국유기농업학회지
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    • 제23권4호
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    • pp.963-974
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    • 2015
  • 유기농 시설채소 재배지 토양의 물리적 특성조사는 전국 33개 농가 포장에서 2014년 8월부터 11월 사이에 조사하였다. 시설채소 재배지 선정은 엽채류인 상추(Lactuca sativa L.)와 잎들깨(Perilla frutescens var. japonica Hara), 과채류인 오이(Cucumis sativus L.), 딸기(Fragaria ananassa L.), 토마토(Lycopersicon spp.)를 경작하는 채소 종류별 5~8개 농가씩 선정하여 경도, 작토심 및 삼상 등 토양의 물리적 특성을 현장조사와 실험실내에서 분석하였다. 연구결과 작토심은 30~50 cm 범위로 평균 36 cm이었고, 재배되는 채소의 종류에 따라서 다소 차이가 있었다. 토양의 경도는 표토에서 $0.17{\pm}0.15{\sim}1.34{\pm}1.02$, 심토에서 $0.55{\pm}0.34{\sim}1.15{\pm}0.62$로 모두 매우 우수하였으며, 표토와 심토간에는 큰 차이가 없었으나 엽채류와 과채류 간에는 통계적으로 유의적인 차이를 나타내었다. 관입저항성은 뿌리 신장과 작물 수량을 결정짓는 토양의 물리적 특성중의 하나이다. 관입저항성은 엽채류 재배지에서 답압으로 인하여 다소 높게 나타났다. 토양의 삼상은 유기농 시설재배지 토양에서 동적이고, 전형적으로 변화되었다. 공극률은 $54.2{\pm}2.2{\sim}60.3{\pm}2.4%$ 범위로 높은 경향을 나타내었다. 이상의 결과를 요약해 보면 유기농 시설채소 재배지 토양은 토심은 깊어지고, 고상과 경도(흙의 단단함), 용적밀도(토양 단위 용적당 질량)는 낮아졌으며, 공극률(토양속 공간함유율)은 높아지는 등 유기농 시설재배지 토양의 물리성이 양호하였다.

입지조건이 다른 시설재배지에서 담수처리에 따른 양분 용탈량 평가 (Evaluation of Nutrient Discharges from Greenhouses with Flooding Soil Surface at Two Different Locations)

  • 김민경;노기안;고병구;박성진;정구복;이덕배;김철수
    • 한국토양비료학회지
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    • 제43권3호
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    • pp.315-321
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    • 2010
  • 시설재배는 폐쇄된 환경에서 제한적인 물관리로 인하여 작기 중에는 외부에 영향을 미치지 않으나, 작물 생산 이후 토양 중 집적된 염류를 제거하기 위해 담수처리를 하게 되는데, 이 때 토양 중 염류가 지표유출 및 용탈을 통하여 주변 수질에 영향을 직접 미치고 있어서 이에 대한 정량적인 평가를 하였다. 입지조건이 다른 두 시설재배지인 경북 상주시 서곡동에 위치한 시설하우스에서 2008년 7월 중순부터 9월 중순까지 시험 전 후의 토양 화학성, 관개량 및 관개수질, 침투수량 및 침투수질, 표면수질, 그리고 조사기간 동안 주변 하천 수질을 조사하였다. 하성평탄지에서는 담수직후의 제염률은 60.4%로 곡간지에 비해 훨씬 높았으며 76.6%까지 높아졌다가 담수 20일 후에는 66.7%이었다. 담수초기부터 곡간지의 표면수중 $NH_4$-N과 $PO_4$-P 농도가 하성평탄지보다 높았으며, 곡간지에서 담수직후와 담수종료 후의 토양깊이별 $Cl^-$${SO_4}^{2-}$ 농도는 큰 차이가 있었으나, 하성평탄지에서는 토양깊이별 ${SO_4}^{2-}$ 농도만 차이가 있었다. 침투수중 $NO_3$-N 농도 변화는 곡간지에 비해 하성평탄지에서 변화의 폭이 컸으며, 시간이 경과할수록 그리고 토양이 깊어질수록 그 농도도 높았다. 또한, 곡간지와 하성평탄지에 있는 시설재배지에서 담수제염에 의한 질소와 인수지를 비교 평가해 본 결과 곡간지와 하성평탄지 모두 유입 부하량보다 유출 부하량이 많아 외부 수계의 영향을 주는 것으로 평가되었다. 특히, 곡간지에 비해 하성평탄지에서의 양분 부하량이 더 많은 것으로 평가되었는데, 곡간지에서는 지하용탈만으로 제염을 하여 지하수의 수질에 영향을 주고 하성평탄지에서는 지하용탈뿐만 아니라 지표용탈에 의한 제염으로 인해 하천수의 수질에 영향을 주는 것으로 평가되었다.

지중관수 방법에 의한 용수절감 효과 (Elect on Saving Water of Underground Trickle Irrigation)

  • 김진현;김철수;김태욱;홍지향
    • Journal of Biosystems Engineering
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    • 제30권2호
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    • pp.102-109
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    • 2005
  • Water consumption at the farm is up to 48 percent of water resource of South Korea while manufacturing industry's is only $9.6\%$. The area of arable land is 2,077,067 ha and 27 percent of it is used for growing fruits and vegetables using furrow or surface irrigation at the greenhouse. Surface irrigation at the greenhouse for fruits and vegetables has problems such as over watering and insufficient supply of water to the fine roots of the plant. However, the research on the new method of irrigation to save water usage is few. The characteristics of soil wetting was measured for using surface irrigation and underground trickle irrigation method where water was supplied at 10, 15, 20, and 25 cm beneath the surface ground. Followings are summary of this study. 1. The efficiency of underground trickle irrigation was expected to be as high as twice of surface irrigation such as drip watering or sprinkling. 2. This improvement could be possible by using less than $50\%$ of irrigation water than surface irrigation to supply similar amount of water near fine roots. 3. Surface irrigation causes soil compaction as deep as 20 cm below the surface ground which reduces soil porosity and root respiration ending up developing less fine roots. 4. Underground trickle irrigation can prevent overdamping in the greenhouse since it does not over wet the surface soil. At winter, the amount of agricultural chemical usage could be reduced since this irrigation method does not develop blight or crop disease from condensation of water vapor.

Source-Sink Partitioning of Mineral Nutrients and Photo-assimilates in Tomato Plants Grown under Suboptimal Nutrition

  • Sung, Jwakyung;Lee, Suyeon;Lee, Yejin;Yun, Hongbae;Ha, Sangkeun;Ok, Yongsik
    • 한국토양비료학회지
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    • 제46권6호
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    • pp.652-658
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    • 2013
  • A huge number of greenhouse soils in Korea have accumulated mineral elements which induce many nutritional and pathological problems. The present study was performed to the effects of the reduced fertilization on plant growth, and uptake and partitioning of minerals (N, P, K) and soluble carbohydrates using highly minerals-accumulated farmer's greenhouse soil. On the basis of the recommended application for tomato crop, the application rates of N, P and K were 110(50%)-5.2(5%)-41.5(35%)kg $ha^{-1}$, respectively, using Hoagland's nutrient solution. Tomato growth rates during the whole experiment were not significant between treatments, but it was found that a decrease in daily growth represented after 60 days of treatment (DAT). The reduced application led to a drastic decrease in the concentration of N, P and K in fruits, and, thus, this resulted in lower uptake after 40 DAT. The lower phloem export and utilization of soluble carbohydrates caused an accumulation of extra-carbohydrates in leaves, stems and fruits in the reduced application. The reduced fertilization induced the capture of N, P and K in leaves and of soluble carbohydrates in stems compared to the conventional application. In this study, we suggest that it is possible to delay the first fertigation time in minerals-accumulated soils without an adverse impact on crop growth, but it is necessary to regularly monitor mineral status in soil to ensure a balanced uptake, synthesis and partitioning of minerals and carbohydrates.

시설애호박 관비재배 시 생육단계별 질소요구량 산정 (Estimation of growth stage-based nitrogen supply levels for greenhouse semi-forcing zucchini cultivation)

  • 하상건;손연규;정강호;이예진;조민지;윤혜진;성좌경
    • 농업과학연구
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    • 제42권4호
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    • pp.319-324
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    • 2015
  • An estimation of the requirement of minerals based on growth stage and cropping pattern is very important for greenhouse zucchini. This study was performed at farmer's field which was applied with a fertigation system and a semi-forcing cultivation from Feb. to July in 2014, and nitrogen levels were set up with x0.5, x0.75, x1.0 and x1.5 of the NO3-N-based soil-testing recommendation for zucchini cultivation. Top dressing of nitrogen (basal : top = 4 : 6) and potassium (basal : top = 3 : 7) was applied with an interval of every two weeks from two and six weeks after transplanting, respectively, and phosphorus was totally supplied with basal dressing. The nitrogen uptake was the order of x1.0, x0.75, x1.5 and x0.5, phosphorus, x1.0, x0.75, x0.5 and x1.5, and potassium, x0.75, x1.0, x1.5 and x0.5. From these results, it was suggested that highest mineral uptake could be reached between x0.75 and x1.0 of the NO3-N-based soil-testing recommendation. In conclusion, nutrient management based on the growth stage was proven to be better method for favorable growth and yield of zucchini.

Impacts of Unsystematic Solid Waste Dumping on Soil Properties and Climate Change

  • Benish ZAHRA;Farida BEGUM;Woo-Taeg KWON;Seung-Jun WOO;Min-Jae JUNG
    • 웰빙융합연구
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    • 제7권3호
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    • pp.31-42
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    • 2024
  • Purpose: Open-air dumping is a significant problem in Gilgit City, with limited research analyzing waste generation and its physicochemical impact on the soil. This study aimed to evaluate the effects of open dumping on soil properties and compare them with a controlled site. Research Design, data, and Methodology: Using ANOVA, the study found significant differences in electrical conductivity (EC), soil organic matter (SOM), soil organic carbon (SOC), sand, silt, and clay between the two sites, except for pH. Pearson correlation revealed that pH negatively correlated with EC, sand, and silt, but positively with SOM, SOC, and clay. The control site's mean EC was 6.06 mS/m, whereas the dumping site recorded 8.5 mS/m. EC is inversely related to SOM, SOC, silt, and clay, but directly to sand. SOC and SOM values varied significantly, with notable differences in soil texture components like clay and silt. Results: The research highlights the detrimental effects of unsystematic waste dumping on soil health and its contribution to greenhouse gas emissions, particularly methane, which exacerbates climate change. Conclusion: The study concluded that waste deposition and decomposition significantly impact EC, SOM, SOC, and soil texture, though pH remains unchanged. The unsystematic dumping of solid waste contributes to climate change through methane production, a potent greenhouse gas. To mitigate these impacts, the study recommends regular monitoring, waste prevention, recycling strategies, and continuous training for stakeholders to achieve sustainable development.

The Effect of Nano-Silver Liquid against the White Rot of the Green Onion Caused by Sclerotium cepivorum

  • Jung, Jin-Hee;Kim, Sang-Woo;Min, Ji-Seon;Kim, Young-Jae;Lamsal, Kabir;Kim, Kyoung-Su;Lee, Youn-Su
    • Mycobiology
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    • 제38권1호
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    • pp.39-45
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    • 2010
  • White rot, which is caused by Sclerotium cepivorum, is a lethal disease affecting green onions. Three different types of nanosilver liquid (WA-CV-WA13B, WA-AT-WB13R, and WA-PR-WB13R) were tested in several different concentrations on three types of media to assess their antifungal activities. Results from in vitro experiments showed that all three of the nano-silver liquids had more than 90% inhibition rates at a concentration of 7 ppm. Greenhouse experiments revealed that all of the nano-silver liquids increased biomass and dry weights, and there were minimal changes in the population of various bacteria and fungi from the soil of greenhouse-cultivated green onions. In addition, a soil chemical analysis showed that there were minimal changes in soil composition.

Characteristics of Greenhouse Gas Emission in the Upland Soil Applied with Agricultural Biomass

  • Park, Woo-Kyun;Kim, Gun-Yeob;Lee, Sun-Il;Shin, Joung-Du;Jang, Hee-Young;So, Kyu-Ho
    • 한국토양비료학회지
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    • 제47권5호
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    • pp.381-389
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    • 2014
  • $NH_4$-N contents in the soil treated were relatively high in the initial stages, but rapidly decreased at 124 days after treatment. $NO_3$-N contents were shown to be opposite patterns of $NH_4$-N contents. $CO_2$ emissions in the non-treatment and Carbonized rice hull treatment with application of NPK fertilizers decreased by 43.7 and 21.9% relative to the non-application of NPK fertilizer plot except 5.4% increasement in the pig manure compost treatment. $N_2O$ emissions of the non-application, the Expander rice hull application, and bio-char treatment increased by 90, 25, and 21.4%, respectively, but decreased by 54.2% in the pig manure compost treatment applied with NPK fertilizers compared with the NPK fertilizer non-application plot.

지온이 포도의 생육에 미치는 영향 (Influence of Soil Zone Temperature on Growth of Grapevines(Vitis spp))

  • 김진한
    • 생물환경조절학회지
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    • 제9권4호
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    • pp.207-211
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    • 2000
  • 지온이 포도의 생육에 미치는 영향을 조사하기 위하여 노지용으로 많이 재배되는 캠벨얼리와 시설포도인 블랙올림피아를 공시하여 지온을 1$0^{\circ}C$, 15$^{\circ}C$, 2$0^{\circ}C$, $25^{\circ}C$로 조절하여 재배하고 생육조사와 더불어 광합성 속도 및 식물체의 무기성분함량을 조사한 결과를 요약하면 다음과 같다. 지온 20~$25^{\circ}C$에서 품종에 관계없이 엽중, 경중, 근중을 비롯한 모든 생육이 좋았다. 광합성 속도와 엽록소 함량은 2$0^{\circ}C$구에서 가장좋았다. 지온이 높아질수록 줄기와 뿌리인 인산, 칼륨, 석회의 함량이 많았다.

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