• Title, Summary, Keyword: Green Rice$^{(R)}$

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Studies an the Egg Parasite, Paracentrobia andoi Ishii (Hymenoptera : Trichogrammatidae) of Green Rice Leafhopper, Nephotettix cinticeps Uhler (1) (끝동매미충 난기생봉 (Paracentrobia andoi)에 관한 연구(I))

  • Kim Jeong-bu
    • Korean journal of applied entomology
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    • v.23 no.4
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    • pp.237-241
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    • 1984
  • The trichogrammatidae ego parasite of the green rice leafhopper (GRLH), paracentrobia andoi, were investigated to know their parasitic activities after overwintering in the paddy banks and fallow fields, their seasonal variation and per cent parasitism in the paddy fields of Gyeongnam provincial O.R.D. at Jinju from 1982 to 1984. The parasitic activities of Paracentrobia andoi after overwintering in the Paddy banks in early Masch were high and tended to decrease remarkably since early April by moving to the fallow fields. The parasitic rate of paracentrobia andoi on GRLH was $21\%$ between late April and early May. the peak of egg laying period of GRLH. The per cent parasitism of the wasps in fallow fields was an average of $0\%$ in Gyeochang and Namji and $9.6-29.2\%$ in Namhae, Kimhae and Jinju. The parasitic activites of Paracentrobia andoi had three peakrs in paddy field, however, the highest peak was ovserved between mid- August and early October. The per cent egg parasitism of Paracentrobia andoi was an average of $16.5\%$ on second generation of Nepotettix cinctireps and $36.7\%$ on third generation of the leafhopper.

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Artificial Neural Network-based Model for Predicting Moisture Content in Rice Using UAV Remote Sensing Data

  • Sarkar, Tapash Kumar;Ryu, Chan-Seok;Kang, Jeong-Gyun;Kang, Ye-Seong;Jun, Sae-Rom;Jang, Si-Hyeong;Park, Jun-Woo;Song, Hye-Young
    • Korean Journal of Remote Sensing
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    • v.34 no.4
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    • pp.611-624
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    • 2018
  • The percentage of moisture content in rice before harvest is crucial to reduce the economic loss in terms of yield, quality and drying cost. This paper discusses the application of artificial neural network (ANN) in developing a reliable prediction model using the low altitude fixed-wing unmanned air vehicle (UAV) based reflectance value of green, red, and NIR and statistical moisture content data. A comparison between the actual statistical data and the predicted data was performed to evaluate the performance of the model. The correlation coefficient (R) is 0.862 and the mean absolute percentage error (MAPE) is 0.914% indicate a very good accuracy of the model to predict the moisture content in rice before harvest. The model predicted values are matched well with the measured values($R^2=0.743$, and Nash-Sutcliffe Efficiency = 0.730). The model results are very promising and show the reliable potential to predict moisture content with the error of prediction less than 7%. This model might be potentially helpful for the rice production system in the field of precision agriculture (PA).

Reclamation of arsenic contaminated soils around mining site using solidification/stabilization combined with revegetation

  • Nejad, Zahra Derakhshan;Kim, Jeong Wook;Jung, Myung Chae
    • Geosciences Journal
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    • v.21 no.3
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    • pp.385-396
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    • 2017
  • Arsenic (As) is a known carcinogen and is one of the most commonly reported contaminants in farmland soils around mining sites. This study aimed to investigate four different soil amendments (rice husk biochar (RHB), maple leaf biochar (MLB), red mud (R.M), and steel slag (S.S)) with respect to the stabilization of arsenic in soil combined with revegetation of two hyperaccumulators (Asteraceae (lettuce) and Brassicaceae (mustard green)). Soil amendments at different application rates (0.5%, 1%, and 2% w/w) and small particle sizes (< $74{\mu}m$) were added to the soil. A different pattern was observed for stabilization of As in treated soils. A meaningful decline in As stabilization was observed with increasing application dosage of MLB, R.M, and S.S, while in case of RHB efficiency was increased. Generally, maximum stabilization efficiency of As was observed following the adding of RHB (2%), MLB (0.5%), R.M (0.5%), and S.S (0.5%), by 90%, 94%, 94%, and 89%, respectively, which was primarily attributed to amendments-induced specific surface area within the structure. For lettuce, As was strongly accumulated by leaves, while As, for mustard green, was extracted much more by its roots. Sequential extraction analysis confirmed high proportions of Fe and Mn oxides and organic fractions of As, before and after planting. Altogether, the establishment of a suitable plant cover on treated soil with amendments showed encouraging results for preventing the dispersion of As through runoff and percolation. Besides, this combined technique, which is aesthetically pleasant, increases biodiversity.

Root-zone Placement of Carbofuran for Control of Rice Insect Pests (Carbofuran 수도근계처리의 해충방제효과)

  • Ryu J. K.;Choi S. Y.;Lee H. R.;Song Y. H.
    • Korean journal of applied entomology
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    • v.16 no.4
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    • pp.217-220
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    • 1977
  • During 1976 the effects of carbofuran placement in the root zone of the rice plants, the varieties Palkweng and Yushin, were evaluated for control of common rice pests in the paddy field at the Honam Crops Experiment Station. The methods of insecticide placement included the use of capsule formulation and liquid injection by the root-zone liquid insecticide injector designed at the International Rice Research Institute. The single ro~t-zone application of carbofuran at 2 days after transplanting was compared with two and fcur broadcast applications of carbofuran and diazinon. Capsules were the most. effective in controlling the striped rice borer (Chilo suppressalis), small brown plant-hopper (Laodelphax striatellus), green rice leafhopper (Nephotettix cincticeps) and stripe virus disease which is transmitted by the small brown planthopper. However, one injector application of carbofuran was equal or better the broadcast applications. Their control effectiveness were more significant on Palkweng susceptible to common rice pests than on Yushin resistant to the stripe virus disease.

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Selection of the Most Sensitive Waveband Reflectance for Normalized Difference Vegetation Index Calculation to Predict Rice Crop Growth and Grain Yield

  • Nguyen Hung The;Lee Byun Woo
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.49 no.5
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    • pp.394-406
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    • 2004
  • A split-plot designed experiment including four rice varieties and 10 nitrogen levels was conducted in 2003 at the Experimental Farm of Seoul National University, Suwon, Korea. Before heading, hyperspectral canopy reflectance (300-1100nm with 1.55nm step) and nine crop variables such as shoot fresh weight (SFW), leaf area index, leaf dry weight, shoot dry weight, leaf N concentration, shoot N concentration, leaf N density, shoot N density and N nutrition index were measured at 54 and 72 days after transplanting. Grain yield, total number of spikelets, number of filled spikelets and 1000-grain weight were measured at harvest. 14,635 narrow-band NDVIs as combinations of reflectances at wavelength ${\lambda}l\;and\;{\lambda}2$ were correlated to the nine crop variables. One NDVI with the highest correlation coefficient with a given crop variable was selected as the NDVI of the best fit for this crop variable. As expected, models to predict crop variables before heading using the NDVI of the best fit had higher $r^2$ (>10\%)$ than those using common broad- band NDVI red or NDVI green. The models with the narrow-band NDVI of the best fit overcame broad- band NDVI saturation at high LAI values as frequently reported. Models using NDVIs of the best fit at booting showed higher predictive capacity for yield and yield component than models using crop variables.

Estimating the Amount of Nitrogen in Hairy Vetch on Paddy Fields using Unmaned Aerial Vehicle Imagery

  • Lee, Kyung-Do;Na, Sang-Il;Baek, Shin-Chul;Park, Ki-Do;Choi, Jong-Seo;Kim, Suk-Jin;Kim, Hak-Jin;Yun, Hee-Sup;Hong, Suk-Young
    • Korean Journal of Soil Science and Fertilizer
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    • v.48 no.5
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    • pp.384-390
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    • 2015
  • Remote sensing can be used to provide information about the monitoring of crop situation. This study was conducted to estimate the amount of nitrogen present in paddy fields by measuring the amount of nitrogen in hairy vetch using an UAV (Unmaned Aerial Vehicle). NDVIs (Normalized Difference Vegetation Index) were calculated using UAV images obtained from paddy fields in Seocheon on May $14^{th}$ 2015. There was strong relationship between UAV NDVI and the amount of nitrogen in hairy vetch ($R^2=0.79$). Spatial distribution maps of green manure nitrogen were generated on each paddy field using the nitrogen-vegetation index relations to help farmers determine the amount of N fertilizers added to their rice fields after the application of green manure such as hairy vetch.

Effects of Dietary Fiber Sources and Levels on Lipid Metabolism in Rats (식이섬유류(食餌纖維類)의 종류(種類)와 수준(水準)이 흰쥐의 분내 지방대사(脂肪代謝)에 미치는 영향(影響))

  • Lee, Yong-Ock;Noh, Jang-Sook;Lee, Jae-Min
    • Journal of the Korean Applied Science and Technology
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    • v.2 no.1
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    • pp.45-55
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    • 1985
  • The present study was designed to investigate the effects of dietary fiber sources and levels on serum lipids in rats fed a hypercholesterol diet containing 0.5% cholesterol. Male Sprague-Dawley rats weighing 52.7 ${\pm}$ 7.27g were devided into sevel groups by completely randomized block design and fed various dietary fibers which were prepared from Rice bran, Siraegi (The dried green parts of a radish) and Bracken Fern at a level of 5% and 10% respectively. The results obtained in this study are summarized as follows: 1. Body weight gains were not significantly different among the groups and food intake was significantly higher in rats fed a diet of Siraegi 10% than those fed the control diet. 2. Fecal wet weights were significantly increased in all experimental groups. 3. Levels of serum total cholesterol in all experimental groups were significantly lower than that of the control group except the level in the R 10(Rice bran 10%) group. 4. Free Cholesterol levels in the serum were increased in all experimental groups, especially the levels in the R 10 (Rice bran 10%) and S 10 (Siraegi 10%) groups were significantly higher than that of the control group. 5. Ester Cholesterol levels in the serum were significantly lower in rats fed the experimental diets than those fed the control diet. 6. There was a tendency of higher serum HDL-Cholesterol levels in R5 (Rice bran 5%), R10 (Rice bran 10%) and B5(Bracken 5%) groups compared to the control group however no significant differences were found between the control group and all the experimental groups except in the case of the S5 (Siraegi 5%) group. 7. LDL, VLDL-Cholesterol levels in the serum sere significantly reduced in the S5 (Siraegi 5%), B5 (Bracken 5%) and B10 (Bracken 10%) groups. 8. The HDL-C./Total-C. Ratio was increased in all experimental group especially the Ratios in the S5 and B5 groups were significantly higher than that of the control group.

An Experimental Study for Dryer (건조기 고안 제작에 관한 연구)

  • 최재갑
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.17 no.1
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    • pp.3677-3684
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    • 1975
  • A newly devised dryer with heated air for the farm products, especially suited for high water content materials such as red pepper, Beer ground, each Vegetables, and Low water content materials such as Rough rice was tested for its thermal efficiency and drying mechanism, and the optimum conditions for each sample were established. In order to improve the present rural situation of drying farm products which entirely dependent upon natural solar radiation, a study upon an economic multi-parpose dryer was conducted. A series of drying tests were run first with red pepper which is one of the important cash crop in Korean farm. And successive series of tests were also run with such proaucts as garlic, sweet potatoes, green onion, radish, Beer ground and Rough rice. The results from the above experiment in drying system with heat dryer can be summarized as follows. 1. Drying duration could be shortened by the tempering effect in high water content crop such as red pepper and beer ground. 2. The color changes occured in around 20% water content in red pepper. The degree of color change was heavily affected by high temperature and short drying duration. 3. The drying condition of red pepper was most favourable at the temperature of 85$^{\circ}C$ in early stage and 80$^{\circ}C$ in middle stage and 75$^{\circ}C$ at the final stage, and with the air rate of 0.81㎥/sec and with sample amount of 200kg. 4. The drying condition of Rough rice(I.R.667) was most favourable at the templature of 40$^{\circ}C$ in early stage and 35$^{\circ}C$ in middle stage and final stage and with the air rate of 0.2㎥/sec and with sample amount of 75kg. 5. In order to prevent the color change of red pepper and to assure high efficiency in drying mechanism, it was necessary to lower the temperature as the time passes in drying process. 6. For vege tables, the drying rate were short in early stage and there was also tempering effect. However, for garlics, Constant drying rates through the early and final stages were observed and there were no tempering effects. 7. The drying condition or capability were as follows; Sample drying temp($^{\circ}C$) amount of material(kg) drying time(hr) Red pepper 85 200 9 Garlic 85 150 7 Sweet potato 85 200 6 Green Onion 85 200 4 Carrot 85 200 4 Radish 90 250 4 Rough rice(I.R.667) 35 75 4 Beer ground 90 320 3 Considering the above result of experiments, if this kind of dryers were distributed Korean farm and the optimun process were practiced in rural area, it would certainly help them improving the qualites of their product preventing their undue losses, and thus assuring an increase of Korean farm income and promotion of their living standards.

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Numerical Computation of the Backscattering Coefficients of Rice Fields Using the Impedance Boundary Condition, Moment Method and Monte Carlo Method (임피던스 경계 조건, 모멘트 법과 몬테 카를로 방법을 이용한 논의 산란계수 수치적 계산과 측정 데이터와의 비교)

  • Hong, Jin-Young;Oh, Yi-Sok
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.7
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    • pp.819-827
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    • 2007
  • A numerical algorithm for estimating precise backscattering coefficients of rice fields is proposed and its accuracy is verified in this paper. After a bunch of rice plants above water surface is modeled with a bunch of randomly oriented lossy dielectric bodies above an impedance surface and the equivalent volume currents of the lossy dielectrics are computed using the moment method. Then, the scattered fields of a rice field with many bunches are computed with a Monte Carlo method, and consequently the backscattering coefficient of the rice field is computed for various incidence angles and polarizations. Finally, the backscattering coefficient of a rice field is measured at 1.85 GHz using an R-band scatterometer system, and these experimental data are used to verify the numerical algorithm proposed in this paper. It is found that the numerical computation results agree well with the measurement data.

Identification of Rice Species by Three Side (Top, Side and Front) Images of Brown Rice (현미 세 면(윗면, 측면, 앞면)의 화상을 이용한 품종 판별)

  • Kim, Sang-Sook;Lee, Sang-Hyo;Rhyu, Mee-Ra;Kim, Young-Jin
    • Korean Journal of Food Science and Technology
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    • v.30 no.3
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    • pp.473-479
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    • 1998
  • Identification of rice species was attempted by three side (top, side and front) images of brown rice. Nine parameters of each image were area, aspect ratio, maximum diameter, minimum diameter, perimeter, roundness and red (R), green (G) and blue (B) pixel values of an image. Forty rice samples consisted of 19 species used for the study and total 27 image characteristics for a kernel were measured. For calibration and confirmation, 105 and 20 brown rice kernels per each sample were used respectively. For best identification of rice species, 24 image characteristics were selected for discriminant analysis. Average percentages for correct identification of rice species were 84.75% and 84.93% for calibration and confirmation data set, respectively. The highest and lowest percentage for correct identification were 99.05% for Nongan and 50.63% for Hwaseung respectively in calibration data. The confirmation data showed that the correct identification of Nongan or Paalgong was 100%, while that of Hwaseung was 47.62%. The result of the study showed that three side (top, side and front) image of brown rice was not suitable for identification of rice species suggesting that additional techniques are required for better discrimination of rice species.

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