• Title, Summary, Keyword: Granular Fertilizer

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Marine Plant Adhesion Properties of Porous Concrete Using Specially Treated Granular Fertilizer (특수처리 입상비료를 이용한 포러스콘크리트의 해양식물 부착특성에 관한 연구)

  • Lee, Byung-Jae;Park, Seong-Bum;Lee, Jun;Son, Sung-Woo;Cho, Kwang-Yeon
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.893-896
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    • 2006
  • This study examined plant adhesion characteristics of the porous concrete that used specially treated granular fertilizer for field application, which was used for the restoration of the marine ecosystem. The results of the experiment showed that nutrient eruption amount, the destruction and dissolution ratio tended to decrease when the coating thickness was increased. The void ratio and compressive strength tended to decrease when the specially treated granular fertilizer mixing ratio was increased. According to these results, the appropriate thickness of coating for cement coated granular fertilizer was 1.0mm. The adhesion ability of marine plant to porous concrete was superior when the cement coated granular fertilizer was mixed. Therefore, the appropriate cement coated granular fertilizer mixing ratio of 20% with a coating thickness of 1.0mm is thought to be a factor when considering the strength of the porous concrete for marine ecosystem restoration and the adhesion characteristics of marine plant.

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Moisture Absorption of Granular Fertilizer and Its Distribution Characteristic in a Pneumatic Applicator (입제비료의 흡습과 송풍식 살포기에서의 비산특성)

  • Hong, J.H.;Kim, Y.J.;Rhee, J.Y.;Chung, J.H.;Kim, J.Y.;Kim, J.H.;Kim, T.W.
    • Journal of Biosystems Engineering
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    • v.31 no.5
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    • pp.389-394
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    • 2006
  • The characteristic of moisture absorption of granular fertilizer was measured at several different opening sizes on the top cover of a hopper in a humid weather. The size of the opening was to represent the degree of looseness of sealing of the top cover of the hopper. The application distribution was characterized by the scattering distance of granular fertilizer with different degree of moisture absorption in a pneumatic granular fertilizer applicator. The moisture absorption rates were 12.92 and 12.26 mg of moisture an hour for one gram of each granular fertilizers of NPK 22-12-12 and 21-17-17, respectively. The moisture absorption increased linearly as the opening size increased. The median value of the scattering distance distribution decreased with time of absorption, however, it decreased very slowly after three hours of absorption.

Design of A Pneumatic Granular Applicator For Paddy Field

  • Chung, Chang-Joo;Chung, Sun-Ok;Cho, Seong-In;Chang, Young-Chang;Park, Yeong-Soo
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • pp.519-527
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    • 1996
  • Most operation related to the application granular agrochemicals in korea are manual and labour consuming. As a multipurpose granular applicator, a pneumatic granular applicator that can be attached to conventional ride -on machines for paddy field was designed in this study. Experiments and simulations were carried out for determine in the design factors with one fertilizer (DongBu 21-17-17) and one pesticide (SamKong Ivi). The maximum terminal velocity of granular chemicals was estimated as 14.2m/s. A better distribution pattern was obtained at the diffuser having only deflectors without dividing guides. The diffuser spacing 1.0m for the fertilizer and the diffuser spacing 0.8m for the pesticide at the boom height over 0.80m were acceptable for the uniform distribution. In the case that the forward speed of ride-on machines was 0.7m/s, the groove opening and the roller speed of the selected metering device were13mm -15mm at 2 rps for the fertilizer, and 9 mm-11mm at 0.25rps or the pesticide. This study suggested a method of developing a pneumatic applicator for granular agrochemicals.

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Characterization of Granular Fertilizer Produced by Fly Ash from a Sewage Sludge Incinerator (하수슬러지 소각 비산재를 이용한 입상비료 조립 및 특성분석)

  • Kim, Seong-beom;Lee, Wontae
    • Journal of Korean Society of Environmental Engineers
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    • v.38 no.10
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    • pp.574-579
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    • 2016
  • This study assessed feasibility of making granular fertilizer with fly ash from a sewage sludge incinerator in Korea. Composition, characteristics, strength, and heavy metal contents of the granular fertilizers were investigated. Due to its high contents of phosphorus, fly ash from a sewage sludge incinerator could be used to make fertilizers. Granulation rates (2-4 mm granules) over 80% could be achieved as the fly ash contents were 15% or less of the fertilizer. Leaching tests of the fertilizers, based upon the Korean Standard Methods for Solid Wastes, showed the concentrations of heavy metals less than the risk limits. However, contents analysis of the fertilizers, based upon the Korean Standard Methods for Soils, experienced higher levels of heavy metals than the risk limits as the fly ash content exceeded 7% of the fertilizer. Thus, the fly ash needs to be added less than 7% of the fertilizer if there is no pretreatment to remove heavy metals.

Development of a Controller for Variable-rate Application of Granular Fertilizer (입제 비료의 변량 살포를 위한 제어기 개발)

  • Yu J.H.;Kim Y.J.;Ryu K.H.
    • Journal of Biosystems Engineering
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    • v.31 no.2
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    • pp.108-114
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    • 2006
  • This study was conducted to design and fabricate a controller for variable-rate application of granular fertilizer based on physical and chemical information, to analyze the performance of the controller and characteristics of a discharger. The result of the study are summarized as follows: 1. The charge ratios of discharger by accumulation heights of fertilizer in hopper were examined, and the variations in charge ratio were $72.58{\sim}93.33%$ and $63.14{\sim}94.42%$ for the fertilizers Super 21 and Sinsedae, respectively. The charge ratio also decreased as the rotational speed of discharger increased. 2. The coefficient of variation of discharge amount by rotational speed and discharge time of discharger were in the range of $2.94{\sim}11.23%$ and $2.82{\sim}10.80%$ for the fertilizer of Super 21 and Sinsedae. Except the rotational speed of 12 rpm, the coefficient of variation for discharge amount were relatively small with 4% more or less 3. In order to evaluate the rotational speed of discharger, the control signal in the range of $0{\sim}5V$ was subdivided into the 50 steps by 0.1V. The regression equation for the rotational speed of discharger was Y=55.984X-79.174(X: input voltage, V, Y: discharger speed, RPM) and the $R^2$ was 0.99. 4. In order to evaluate the performance of the controller for variable-rate application of granular fertilizer, settling time to unit step input was examined. The settling time varied from 0.8sec to 1.4 sec.

A Study on the Properties of Porous Concrete For Kelp Forest Regeneration Using Cement Coating Granular Fertilizer (시멘트 코팅 입상비료를 이용한 조장조성용 포러스콘크리트의 특성에 관한 연구)

  • Park Seong Bum;Lee Jun;Kim Jeong Hwan;Seo Dae Seuk;Lee Byung Jae;Song Jae Lib
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.489-492
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    • 2005
  • The Purpose of this study is to develope the method for early recovery of the biodiversity in the oligotrophical costal area. The result of this study, the dissolution ratio is superior in the case which the cement coating thickness of the granular fertilizer is below 1mm. From the failure-side it is judged with the fact that appropriate to use the separate charging method and vibration compaction method. For the cases of the mixing ratio of cement coating granular fertilizer, there was not any clear tendency for the change of the strength up to 20$\%$ of the mixing ratio. However, at the 30$\%$ mixing ratio, decrease of the strength was noticed. So it can be concluded that the stability can be achieved in the range of 20$\%$ and below.

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Effect of Granular Fused Magnesium Phosphate on Growth and Yield of Barley (대맥(大麥)에 대(對)한 입상용성인비(粒狀熔成燐肥)의 입도별(粒度別) 비효)

  • Lee, Jong-Ho;Ryu, In-Soo
    • Korean Journal of Soil Science and Fertilizer
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    • v.14 no.4
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    • pp.210-214
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    • 1982
  • A field experiment to compare the effects of different granular sizes of fused magnesium phosphate (FMP) on the growth and yield of barley plants was conducted on a loam soil during the 1978/1979 cropping period. The results were summarized as follows: 1. No significant differences in yield were observed between the application of comercial FMP, mixture of large and small granules, and small granular FMP; however, the smaller FMP application increased the yield of barley by 5 percent than the larger FMP application. 2. The fresh root weight and the total dry matter were greater in the smaller granular FMP, and the yield showed a linear relationship with the fresh root weight.

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Effects of Granular Silicate on Watermelon (Citrullus lanatus var. lanatus) Growth, Yield, and Characteristics of Soil Under Greenhouse

  • Kim, Young-Sang;Kang, Hyo-Jung;Kim, Tae-Il;Jeong, Taek-Gu;Han, Jong-Woo;Kim, Ik-Jei;Nam, Sang-Young;Kim, Ki-In
    • Korean Journal of Soil Science and Fertilizer
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    • v.48 no.5
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    • pp.456-463
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    • 2015
  • The objective of this study was to determine the effects of granular type of silicate fertilizer on watermelon growth, yield, and characteristics of soil in the greenhouse. Four different levels of silicate fertilizer, 0(control), 600, 1,200, $1,800kg\;ha^{-1}$ were applied for experiment. The silicate fertilizer was applied as a basal fertilization before transplanting watermelon. Compost and basal fertilizers were applied based on the standard fertilizer recommendation rate with soil testing. All of the recommended $P_2O_5$ and 50% of N and $K_2O$ were applied as a basal fertilization. The N and $K_2O$ as additional fertilization was split-applied twice by fertigation method. Watermelon (Citrullus lanatus Thunb.) cultivar was 'Sam-Bok-KKuol and main stem was from rootstock (bottle gourd: Lagenaria leucantha Standl.) 'Bul-Ro-Jang-Sang'. The watermelon was transplanted on April, 15. Soil chemical properties, such as soil pH, EC, available phosphate and exchangeable K, Mg, and available $SiO_2$ levels increased compared to the control, while EC was similar and the concentrations of soil organic matter decreased. Physical properties of soils, such as soil bulk density and porosity were not different among treatments. The growth characteristics of watermelon, such as stem diameter, fresh and dry weight of watermelon at harvest were thicker and heavier for silicate treatment than the control, while number of node was shorter than the control. Merchantable watermelon increased by 3-5% compared to the control and sugar content was 0.4 to $0.7^{\circ}Brix$ higher than the control. These results suggest that silicate fertilizer application in the greenhouse can improve some chemical properties of soils and watermelon stem diameter and dry weight, which are contributed to watermelon quality and marketable watermelon production.

Effects of Composted Liquid Manure and Microbial Agent Types on Growth and Thatch Decomposing of Creeping Bentgrass (가축분뇨발효액비와 미생물제제 종류별 시용에 따른 크리핑 벤트그래스의 생육과 토양중 대취분해에 미치는 영향)

  • Lim, Ji Yeon;Ham, Suon Kyu;Lee, Yeong Min;Cha, Young Gi
    • Journal of the Korea Organic Resources Recycling Association
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    • v.22 no.4
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    • pp.54-61
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    • 2014
  • This study was conducted to investigate the effect of Actinomyces sp. and Bacillus sp., United States granular microorganisms and Japan granular microorganisms on turfgrass growth and thatch decomposing of creeping bentgrass in golf course by measuring turf color index, chlorophyll index, thatch content of soil, root length, turf density and chemical properties and thatch content of soil. Fertilizer treatment was designed as follows; control(CF; compound fertilizer), microorganism medium(M; CF+M), microorganism medium and livestock manure fertilizer(M-L; CF+M+LMF), microorganism medium, livestock manure fertilizer and amino acid liquid fertilizer(M-L-A; MM+LMF+ALF), United States granular microorganisms(USGM; CF+USGM), Japan granular microorganisms(CF+JGM). Soil properties investigated after experiment was scarcely affected by applied fertilizers in root zone of creeping bentgrass. The turf color index and chlorophyll index of M, M-L, M-L-A, USGM, JGM treatment were higher than those of CF. The turfgrass root in M-L treatment was longer than others. The thatch content of soil in M treatment was longer than others. The thatch content of M was decreased than that of CF by 6.8%. These was suggested that application of M induced the development of quality and growth of creeping bentgrass by assisting turfgrass growth and thatch decomposing.

A study on Development of a Pneumatic Granular Applicator for Paddy Field (I) - Granular Discharge Rate, Diffuser and Optimal Application Conditions - (수도작용 송풍식 입제살포기 재발에 관한 연구 (I) - 입제 배출량, 분두 및 적정살포조건 -)

  • 정창주;정선옥;장영창;최영수;최중섭
    • Journal of Biosystems Engineering
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    • v.22 no.2
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    • pp.127-136
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    • 1997
  • This study was accomplished to develop a pneumatic granular applicator that can be attached to the conventional ride-on rice transplanter. Operating conditions of a metering device for the applicator were determined so as to obtain the required discharge rate of granules for field application. The shape and size of diffuser was selected for the applicator and the spacing between diffusers on a boom and the boom height were determined as an optimal application condition for uniform distribution. The diffuser spacing of 1m for the fertilizer and the diffuser spacing of 0.8m for the pesticide at the boom height over 0.8m were acceptable.

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