• Title/Summary/Keyword: yield conditions

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Unveiling the Potential: Exploring NIRv Peak as an Accurate Estimator of Crop Yield at the County Level (군·시도 수준에서의 작물 수확량 추정: 옥수수와 콩에 대한 근적외선 반사율 지수(NIRv) 최댓값의 잠재력 해석)

  • Daewon Kim;Ryoungseob Kwon
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.25 no.3
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    • pp.182-196
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    • 2023
  • Accurate and timely estimation of crop yields is crucial for various purposes, including global food security planning and agricultural policy development. Remote sensing techniques, particularly using vegetation indices (VIs), have show n promise in monitoring and predicting crop conditions. However, traditional VIs such as the normalized difference vegetation index (NDVI) and enhanced vegetation index (EVI) have limitations in capturing rapid changes in vegetation photosynthesis and may not accurately represent crop productivity. An alternative vegetation index, the near-infrared reflectance of vegetation (NIRv), has been proposed as a better predictor of crop yield due to its strong correlation with gross primary productivity (GPP) and its ability to untangle confounding effects in canopies. In this study, we investigated the potential of NIRv in estimating crop yield, specifically for corn and soybean crops in major crop-producing regions in 14 states of the United States. Our results demonstrated a significant correlation between the peak value of NIRv and crop yield/area for both corn and soybean. The correlation w as slightly stronger for soybean than for corn. Moreover, most of the target states exhibited a notable relationship between NIRv peak and yield, with consistent slopes across different states. Furthermore, we observed a distinct pattern in the yearly data, where most values were closely clustered together. However, the year 2012 stood out as an outlier in several states, suggesting unique crop conditions during that period. Based on the established relationships between NIRv peak and yield, we predicted crop yield data for 2022 and evaluated the accuracy of the predictions using the Root Mean Square Percentage Error (RMSPE). Our findings indicate the potential of NIRv peak in estimating crop yield at the county level, with varying accuracy across different counties.

Optimization of Extraction Conditions and Quantitative Analysis of Isoquercitrin and Caffeic Acid from Aster scaber

  • Lee, Ju Sung;Quilantang, Norman G.;Nam, Kung-Woo;Piao, Xiang-Lan;Chung, Mi Ja;Lee, Sanghyun
    • Natural Product Sciences
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    • v.24 no.3
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    • pp.199-205
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    • 2018
  • To determine the optimum extraction conditions that give the highest yield of isoquercitrin and caffeic acid from Aster scaber, the effects of four extraction variables (solvent concentrations, extraction time, number of repeated extraction, and solvent volumes) on isoquercitrin and caffeic acid yield was examined via HPLC-UV. Our results showed that the highest extract and isoquercitrin yield were observed when A. scaber was extracted with 450 mL distilled water for 8 hr repeatedly for three times. In case of caffeic acid, the content was higher in the two repeated extracts. Also, content analysis of isoquercitrin in Aster species was performed in which A. fastigiatus, A. ageratoides, and A. scaber exhibited the highest isoquercitrin content at 6.39, 5.68, and 2.79 mg/g extract, respectively. In case of caffeic acid, the highest content of A. scaber and A. glehni was 0.64 and 0.56 mg/g extract, respectively. This study reports an optimized method for extraction of isoquercitrin and caffeic acid from A. scaber and evaluates potential sources of the compounds.

Characteristics of Powder with Amount of Reductant Excess in Production of Tantalum Powder by MR-EMR Combination Process (MR-EMR 복합공정에 의한 탄탈륨분말의 제조시 과잉첨가 환원제 양에 따른 분말의 특성)

  • 배인성;윤재식;박형호;김병일;이현우;김낙찬;설경원
    • Journal of Powder Materials
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    • v.11 no.4
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    • pp.333-340
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    • 2004
  • In this study, tantalum powder has been producted by MR-EMR combination process. MR-EMR combination process is a method that is able to improve demerits of MR(metallothermic reduction) and EMR(electronically mediated reaction) process. This study examined the characteristics of powder with the amount of reductant excess using $K_2$TaF$_{7}$ as feed materials, Na as a reductant and KCl/KF as a diluent. In addition, this study examined acid treatment that affect the high purification of powder. The impurities contained in powder was removed in various conditions of acid treatment. The total charge passed through external circuit and average particle size(FSSS) were increased with increasing amount of sodium excess. The proportion of fine particle(-325mesh) was decreased with increasing amount of sodium excess. The yield was improved from 70% to 76% with increasing amount of sodium excess. Considering the impurities, charge, morphology, particle size and yield, an amount of sodium excess of 10wt% were found to be optimum conditions for MR-EMR combination process.s.

The resistance characterization of OTP device using anti-fuse MOS capacitor after programming (안티퓨즈 MOS capacitor를 이용한 OTP 소자의 프로그래밍 후의 저항특성)

  • Chang, Sung-Keun;Kim, Youn-Jang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.6
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    • pp.2697-2701
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    • 2012
  • The yield of OTP devices using anti-fuse MOS capacitor have been affected by the input resistance, the size of the pass transistor and the read transistor, and the readout voltage of programed cell. To investigate the element which gives an effect to yield, we analyze the full map data of the resistance characterization of OTP device and those data in a various experimental condition. As a result, we got the optimum conditions which is necessary to the yield improvement. The optimum conditions are as follows: Input resistance is 50 ohms, the channel length of pass transistor is 10um, read voltage is 2.8 volt, respectively.

Optimization of Shark (Squatina oculata) Cartilage Hydrolysis for the Preparation of Chondroitin Sulfate

  • Jo, Jin-Ho;Do, Jeong-Ryong;Kim, Young-Moung;Kim, Dong-Soo;Lee, Taek-Kyun;Kim, Seon-Bong;Cho, Seung-Mock;Kang, Suk-Nam;Park, Douck-Choun
    • Food Science and Biotechnology
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    • v.14 no.5
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    • pp.651-655
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    • 2005
  • Enzymatic hydrolysis of shark (Squatina oculata) cartilage (SC) was optimized by response surface methodology (RSM) for chondroitin sulfate (CS) preparation. Among 11 commercial proteases, Maxazyme NNP showed highest productivity (CS yield per enzyme cost) of CS. Optimal hydrolysis conditions determined by RSM were 1.63% and 2.87 hr for enzyme concentration and hydrolysis time ($r^2\;=\;0.9527$, p<0.0l), respectively and highest yield of hydrolysate under the conditions was 42.3%. The yield ($43.1{\pm}2.1%$) and CS content ($24.8{\pm}0.1%$) of hydrolysate at optimal condition verified statistical optimization of SC enzymatic hydrolysis was valid.

Potential of proteolytic enzyme treatment for production of Korean red ginseng extract (홍삼 추출물의 제조에서 단백질 분해효소의 활용)

  • Kim, Dong Chung;Lee, Tae Jung;In, Man-Jin
    • Journal of Applied Biological Chemistry
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    • v.62 no.4
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    • pp.385-389
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    • 2019
  • In this study, proteolytic enzymatic treatment conditions for Korean red ginseng were examined to increase the extraction yield. Commercially available proteases were screened to obtain high protein and carbohydrate yield. The optimal dosage and reaction time for Alcalase, the chosen protease, were found to be 2.0% (w/w) and 1.5 h, respectively. Treatment with optimal conditions of Alcalase increased solid yield, total phenolic content and gensenosides content by 57.6, 81.8, and 33.8%, respectively, over levels in non-treated Korean red ginseng. Antioxidative activities evaluated by free radical scavenging activity, cation radical scavenging activity and reducing power were exactly similar between Alcalase-treated and non-treated extracts.

Effect of Fungicide Benoram Seed Treatment on Germination, Growth, and Yield in Summer-Type Soybean (종자소독제 Benoram 처리가 하대두의 발아, 후기생육 및 수량에 미치는 영향)

  • 정길웅;주정일
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.38 no.2
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    • pp.166-173
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    • 1993
  • Seed infection to pod and stem blight (Diaporthe phaseolorum) is severe at summer type soybeans maturing at hot and humid conditions. In order to increase germination and plant stand, this experiments were evaluated the effects of fungicide Benoram(Benomyl 20% ${\pm}$ Thiram 20%) seed treatments with different seed sizes on emergence yield at field conditions, and with different infection degrees to pod and stem blight on germination in laboratory. Benoram treatment on seed was improved emergence rate and elongated hypocotyl not increased growth and yield. It was clearly improved length but germinations and germination speed by Benoram fungicide treatment on severely infected seed however was not improved germination rate at good quality of seeds and the effect was higher at large seed cultivar than small ones.

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Optimization of Reaction Conditions for High Yield Synthesis of Carbon Nanotube Bundles by Low-Temperature Solvothermal Process and Study of their H2 Storage Capacity

  • Krishnamurthy, G.;Agarwal, Sarika
    • Bulletin of the Korean Chemical Society
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    • v.34 no.10
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    • pp.3046-3054
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    • 2013
  • Synthesis of Carbon Nanotube bundles has been achieved by simple and economical solvothermal procedure at very low temperature of $180^{\circ}C$. The product yield obtained was about 70-75%. The optimization of reaction conditions for an efficient synthesis of CNTs has been presented. The CNTs are obtained by reduction of hexachlorobenzene in the presence of Na/Ni in cyclohexane. The X-ray diffraction, Fourier transform infrared and Raman spectral studies have inferred us the graphene structure of the products. The CNTs formed as the bundles were viewed on scanning electron microscope, transmission electron microscope and high-resolution transmission electron microscope. These are the multiwalled CNTs with outer diameter of 5-10 nm, the inner diameter 2-4 nm and cross sectional diameter up to 5 nm. Brunauer-Emmett-Teller (BET) based $N_2$ gas adsorption studies have been made to obtain BET surface area and $H_2$ storage capacity. Effect of the experimental variables such as reaction temperature, amount of catalyst and the amount of carbon source were investigated. It is found that they affect significantly on the product nature and yield.

Studies on Fungal Lipids Containing ${\gamma}$-Linolenic Acid 2. Influence of Cultural Conditions on The Production of ${\gamma}$-Linolenic Acid by Mucor sp. (${\gamma}$-Linolenic acid 함유 곰팡이 지질에 관한 연구 2. Mucor sp.의 ${\gamma}$-Linolenic Acid 생산에 미치는 배양조건의 영향)

  • 송근섭;김충기;권용주;양희천;이태규
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.19 no.6
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    • pp.641-645
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    • 1990
  • In order to study the influence of culture conditions on cell growth and lipid formation by Mucor sp, various carbon and nitrogen sources initial pH and C./N ratio of medium were investigated. Glucose was found to be suitable carbon source in terms of lipid yield and ${\gamma}$-linolenic acid(GLA) content. When NH4Cl and (NH4)2SO4 were used as nitrogen source lipid content was high(19-21%) but GLA content was low(15-17%) On the other hand when NaNO3 and KNO3 were used lipid content was low(about 13%) but GLA content was high(22-23%). The highest production of lipid was obtained at a C/N ratio of 40 using glucose and (NH4)2SO4 as carbon and nitrogen source respectively. it was found that lipid yield was high at pH4.6 Also this fungus did not grow at 35$^{\circ}C$ and lipid yield was highr at 15$^{\circ}C$ than $25^{\circ}C$.

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Biological Control of Alternaria Fruit Rot of Chili by Trichoderma Species under Field Conditions

  • Begum, Most. Ferdousi;Rahman, M.A.;Alam, M. Firoz
    • Mycobiology
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    • v.38 no.2
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    • pp.113-117
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    • 2010
  • Trichoderma strains were evaluated under field conditions to assay their efficacy in suppressing Alternaria fruit rot disease and promoting chili plant growth. The experiment was conducted at the Botanical Garden, Rajshahi University, Bangladesh from July 2006 to March 2007. Application of Trichoderma harzianum IMI 392432 significantly (p = 0.05) suppressed the disease compared to Alternaria tenuis (T2) treatment and improved both growth and yield. The treatment T4 (T. harzianum IMI-392432 + A. tenuis) was most effective in reducing disease percentage (72.27%) compared to A. tenuis (T1) treatment. The highest seed germination rate (85.56%) and the highest growth and yield (12.5 g/plant) was also recorded in the same treatment (T4), followed by T5 (T. harzianum IMI-392433 + A. tenuis), T6 (T. harzianum IMI-392434 + A. tenuis), T2 (T. virens IMI-392430 + A. tenuis), and T3 (T. pseudokoningii IMI-392431 + A. tenuis) treatment, while single treatment with A. tenuis significantly decreased these values.