Choi S. Y.;Heu M. H.;Chung K. Y.;Kang Y. S.;Kim H. K.
Korean journal of applied entomology
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v.14
no.3
s.24
/
pp.147-153
/
1975
During 1973 a field experiment was carried out to evaluate effectiveness of the root zone application of insecticides in medical gelatin capsules for control of several rice insect pests and dwarf virus disease. At three days after transplanting the capsules were pushed by hand about 2.5cm into the soil, near roots of Tongil rice plants. At the given day intervals number of leaf-and plant-hoppers on the hills were recorded by direct count, and dead hearts and white heads by stem borers and dwarf virus infected hills were observed in the experiment plots. Finally grain yields were measured. The percentages of dead hearts and white heads in all the plots were too low for evaluating the effectiveness of insecticides against the striped rice borers. Carbofuran of the insecticides tested was relatively effective against green rice leafhopper (Nephotettixcincticeps) and small brown planthopper (Laodelphax striatellus), although small number of insects on the hills were recorded. Relatively small number of white-backed planthopper (Sogatella furcifera) was occured in the BPMC and Diazinon treated plots. BPMC and Carbofuran were highly effective against the brown planthopper (Nilaparvata lugens) to 80 days after treatment. Incidence of dwarf virus disease was least in the plots of Carbofuran treatment. The highest grain yield was recorded in the plots treated with Carbofuran, and it seemed to be related with good protection from the dwarf virus disease and leaf-and plant-hoppers.
To select the effective fungicides for the control of leaf spot disease of jujube tree (Zizyphus jujuba) caused by Phoma sp., inhibitory effects of 26 fungicides for mycelial growth were investigated at $250{\mu}g\;a.i./m{\ell}$. In the test, eight fungicides were selected and minimum inhibitory concentration (MIC) for mycelial growth and an inhibitory effect for spore germination were investigated. Among the fungicides, myclobutanil, hexaconazole, and triflumizole were excluded in control effect tests because of their relatively high MICs. MICs were ranged $10-50{\mu}g\;a.i./m{\ell}$ for benomyl, carbendazim + kasugamycin (CK), and thiophanate-methyl. triflumizole (TT), and $50-250{\mu}g\;a.i./m{\ell}$ for iprodione + propineb (IT) and iminoctadine-triacelate (IT). However, benomyl and IP showed very low inhibitory effect on conidial germination. When the fungicides were sprayed on the seedlings before the leaves were inoculated with conidial suspension of Phoma sp., the protective values of CK and TT were around 70% at 1,000 ppm and around 90% at 2,000 ppm. The protective values were around 70% at 2,000 ppm (benomyl), 4,000 ppm (IP), and 8,000 ppm (IT). When the fungicides were sprayed after inoculation, benomyl showed the highest curative values of over 90% at 1,000 ppm and the values of CK and TT ranged $70{\sim}80%$ at 1,000 ppm. However, IP and IT had little or no effect on therapy of the disease. IT caused necrotic phytotoxicity on the leaves of jujube seedlings. As results, the best fungicides for the protection of jujube trees from leaf spot disease were CK (2,000 ppm) and TT (2,000 ppm) and for the remedy of the tree, benomyl (1,000 ppm) was the best. Therefore, alternate application of benomyl and CK or TT will be effective in the disease control.
A field-scale study was conducted to evaluate the effect of organic matter amendments on the solubility of arsenic (As) in paddy soil and uptake by rice. Six organic matter (rice bran, rice straw, pig/cattle/fowls manure compost and swine liquid manure) were added to two polluted soils with high As (53 mg kg-1) and low As concentration (28 mg kg-1), and changes in soil solution constituents was monitored. The mean As concentrations in soil solution from the high As soil with rice bran, pig manure compost and swine liquid manure addition were significantly higher (0.61-1.15 mg L-1) than that of the control (0.42-0.66 mg L-1). Regression between As and Fe in soil solution indicated that As was attributable to reductive dissolution of Fe (hydr)oxides and it was driven by organic matter addition. Mean As concentrations in brown rice from the high As soil were 0.35-0.46 mg kg-1, above the maximum safety level of inorganic As (0.35 mg kg-1), and tended to be higher in organic matter amended soils than that of the control. The significant correlation between grain As and soil solution As was not observed and it was probably attributable to As tolerance of rice causing the reduction of As uptake and/or translocation to grain. However, considering the significant As release in soil solution from the high As soil and the tendency of grain As elevation after organic matter addition, it is needed to be cautious for food safety when amending organic matter to paddy soil with high As concentration.
Jeong Sung Jung;Se Young Lee;Mirae Oh;Hyung Soo Park;Ana Yun;Ki Choon Choi
Journal of The Korean Society of Grassland and Forage Science
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v.43
no.1
/
pp.35-41
/
2023
This experiment was carried out to examine double cropping system using Italian ryegrass (IRG) 'Kowinearly', whole crop rice 'Yeongwoo' and barnyard millet 'Jeju native' during the Oct. 2020 to Oct. 2022. Three kinds of forage crops were cultivated at paddy field in Livestock Institute, Jeollanamdo Agricultural Research and Extension Services, Jeollanamdo, South Korea. Whole crop rice (WCR) was sown in late May and barnyard millet (BM) sown early June each year after harvesting IRG. We examined dry matter yield and feed value of forage crops depending on harvest time of forage crops during the experimental period. The plant height in heading stage of IRG ranged from 108 to 112cm and dry matter yield ranged from 6,783 to 11,530 kg ha-1. The crude protein (CP) of IRG ranged from 6.0 to 8.44%, acid detergent fiber (ADF) ranged from 55.6 to 60.2% and neutral detergent fiber (NDF) ranged from 32.58 to 36.7%, The dry matter yield of WCR increased as the harvest stage was delayed (14,310 kg ha-1 in milk, 16,167 kg ha-1 in yellow ripen, and 18,891 kg ha-1 in mature). Similar to results of dry matter yield of WCR, dry matter yield of BM increased as the harvest stage was delayed (11,194 kg ha-1 in late heading. and 14,308 kg ha-1 in mature), However nutrient content of WCR and BM showed a decreasing trend. As shown in above results, the productivity of WCR after harvesting IRG was shown to be high at paddy field in the southern region. However, BM also was appeared to have potential as summer forage crops.
Korean Journal of Agricultural and Forest Meteorology
/
v.25
no.3
/
pp.129-141
/
2023
Crop models have been used to predict yield under diverse environmental and cultivation conditions, which can be used to support decisions on the management of forage crop. Cultivar parameters are one of required inputs to crop models in order to represent genetic properties for a given forage cultivar. The objectives of this study were to compare calibration and ensemble approaches in order to minimize the uncertainty of crop yield estimates using the SIMPLE crop model. Cultivar parameters were calibrated using Log-likelihood (LL) and Generic Composite Similarity Measure (GCSM) as an objective function for Metropolis-Hastings (MH) algorithm. In total, 20 sets of cultivar parameters were generated for each method. Two types of ensemble approach. First type of ensemble approach was the average of model outputs (Eem), using individual parameters. The second ensemble approach was model output (Epm) of cultivar parameter obtained by averaging given 20 sets of parameters. Comparison was done for each cultivar and for each error calculation methods. 'Jowoo' and 'Yeongwoo', which are forage rice cultivars used in Korea, were subject to the parameter calibration. Yield data were obtained from experiment fields at Suwon, Jeonju, Naju and I ksan. Data for 2013, 2014 and 2016 were used for parameter calibration. For validation, yield data reported from 2016 to 2018 at Suwon was used. Initial calibration indicated that genetic coefficients obtained by LL were distributed in a narrower range than coefficients obtained by GCSM. A two-sample t-test was performed to compare between different methods of ensemble approaches and no significant difference was found between them. Uncertainty of GCSM can be neutralized by adjusting the acceptance probability. The other ensemble method (Epm) indicates that the uncertainty can be reduced with less computation using ensemble approach.
In order to manufacture feed suitable for consumer use and provide feed value information, we analyzed the feed components of the four main forage rice varieties by plant parts harvested 30 days after heading. The contents of the six feed ingredients were significantly different (p<0.05) among harvested parts. In the panicle, the crude protein (CP) (6.97%) and lignin (3.11%) were the highest, while the crude ash (CA) and neutral detergent fiber (NDF) contents were significantly lower, resulting in a total digestible nutrient (TDN) content of 77.29%, which is higher than that of the stem (64.82%) and leaf blade and sheath (LBS) (63.57%) (p<0.05). In contrast, the content of crude fat (CF) did not differ significantly among parts (p<0.05). In panicles from 'Jonong', 'Nokyang' and 'Yeongwoo', the TDN content of each cultivar was 78.48-79.07%, with no significant difference among the varieties. In 'Mogwoo' (Mw), the CP content was 8.70%, which was much higher than that of other varieties (p<0.05). In particular, the Mw TDN content was slightly lower in the panicle (72.95%) but higher in the stem (75.37%) and LBS (66.49%) than in the other varieties. The CA, NDF, acid detergent fiber (ADF), and lignin contents were also very low compared to other varieties; therefore, the feed value of the stem and LBS was excellent. In addition, the total dry matter weight (DMW) was 123 g per hill, which was much higher than 82-105 g per hill for other varieties. The distribution of DMW by part was LBS (56.9 g), stem (36.8 g), and panicle (29.3 g), and because the parts, except the panicles, were much higher than the 43-57% of other varieties (grain straw ratio: 76%), rice straw is advantageous in terms of quantity and feed value when used as forage on farms. The relative feed value (RFV) of the four cultivars ranged from 86.79-403.74 across all parts, and hay of grade 3 or higher with an RFV of 100 or more increased with delayed heading in both stems and LBS. This is due to the accumulation of starch into grains during ripening, which supports the observation that the RFV of the early flowering 'Jonong' and 'Nokyang' panicles increased.
Choe, Bong Ho;Lee, In Sup;Park, Jong Seong;Kim, Yong Rae
Korean Journal of Agricultural Science
/
v.7
no.1
/
pp.12-26
/
1980
A new, improved maize varieties are greatly needed to meet the national demand for the maize, and a new germplasm should be investigated to supply necessary breeding materials for the required maize breeding. The Korean local maize lines, which has never been wholly studied for the purpose of breeding should be enough to supply such breeding materials at least in Korea. The objectives of this study were to maintain useful Korean local lines, to investigate good plant characters and to analyze the Korean local maize lines in the respect of genetic make-up. A total of 820 lines and 200 lines were used for the present study. Lines to maintain were planted at experimental farm of the Crop Experiment Station, Office of Rural Development, Suwon and the lines to study genetic make-up were planted in Dae-jon. The summarized results are as follows : 1. A total of 1200 lines from 820 collections were sibbed for future use. 2. Two hundred collection were sibbed, selfed and testcrossed for genetic study in 1980. 3. Ten lines were surely confirmed as resistant lines to virus disease epidemic in most introduced maize varieties. 4. A dozen Lines were having three to four ears per plant. 5. Five lines were showing three to four tillers per plant. 6. One of the most significant and important finding through the study was to obtain the lines with three to four tillers bearing all together eight to nine ears. The lines of multi-ears and multi-tillers must have great breeding potential for the future use. 7. A great variation was observed in the tasselling days, 100 kernel weight and protein content. 8. From the genetic study of local maize lines for plant height and 100 kernel weight, the following findings were obtained. a. On the average six percent of inbreeding depression expressed in percent decrease over sibbed counterpart were found for the plant height. b. Fourty percent of heterosis expressed in percent increase over sibbed counterpart were observed in the plant height. c. The homogeneity or degree of homozygosity calculated from heterosis minus inbreeding depression was on the average 34 percent for plant height. d. The average inbreeding depression expressed in percent decrease over sibbed counterpart was 15 percent for 100 kernel weight. e. The average heterosis expressed in percent increase over sibbed counterpart was 43 percent for 100 kernel weight. f. The degree of homozygosity calculated from the heterosis minus inbreeding depression was 28 percent for 100 kernel weight.
This study was carried out to examine the quality of Korean pork regular loins and hams which m exported in Japanese market. The samples were stored at 0${\pm}$1$^{\circ}C$(A, B companies) and 2${\pm}$1$^{\circ}C$(C, D companies). In analysis of Korean pork exported to Japanese market, the pork of A and D companies showed below 10$\^$6/CFU/$\textrm{cm}^2$ of total aerobic bacteria at 40 days storage and panels felt off-flavor after 40 days. Therefore the edible period will be 40 days through the analysis of microbe and sensory test in porks of A and D companies. The porks of B and C companies showed over 10$\^$6/CFU/$\textrm{cm}^2$ of total aerobic bacteria at 50 days storage and panels couldn't feel off-flavor in sensory test after 50 days. Therefore the edible period will be 50 days through the analysis of microbe and sensory test in porks of B and C companies. As the results, shelf-life of A and D companies will be 32 days and B and C companies will be 40 days from edible period by a factor of 0.8. In analysis of stored pork for export in Korean market, the porks of A and B companies showed over 10$\^$6/CFU/$\textrm{cm}^2$ at 40 days storage and C and D companies did over 10$\^$6/CFU/$\textrm{cm}^2$ at 30 days storage in analysis of microbe. The pork of A and D companies showed 10$^4$CFU/$\textrm{cm}^2$ but B and C companies did 10$\^$5/CFU/$\textrm{cm}^2$ at 50 days in coliform count. Therefore shelf-life of the pork of A company was logest and the next were B and C, but shelf-life of the pork of D company was 20 days, therefore it was even shorter than the others.
An acid tolerant R. meliloti "YA03" which was characterized through both acidified tube and pot soil experiment, was examined on its inoculation effect to alfalfa[Medicago sativa (L.)]cv. Vernal on hilly acid soil. It was conducted for 2 years to evaluate inoculation residual effect and there were two-fertilizer factors of nitrogen(0.8kg/10a) and lime(0,162kg/10a)as urea and $Ca(OH)_2$, respectively. The results obtained were summarized as follows : 1. In the 1st-year experiment, YA03 inoculated without nitrogen and lime application showed higher symbiotic effectiveness than check strains, YA026 and Rm2011 in nodule mass, $N_2$-fixing activity, and dry matter yield, but with N 8kg/10a application lower effectiveness than Rm2011. 2. In the 2nd-year experiment, Alfalfa dry matter yield by YA03 inoculation with N application(without lime) was 74% higher than that(276 kg/10a) in the 1st year, and the value showed 166%, 20%, and 21% increments as compared with noninoculated control(180kg/10a). YA026(399kg/10a), and Rm2011(397kg/10a), respectively. 3. In the 2nd-year experiment of N applicated plote(without lime), especially, YA03 showed higher shoot nitrogen(7.7kg N/10a/Yr.) fixed and soil rhizobial population($1{\times}10^4\;cells/g.\;soil$) than check strains. 4. On the basis of lime application, application effect of three major fertilizers with YA03 inoculation on alfalfa yield and soil rhizobial population was in the order of $N+P_2O_5+K_2O>P_2O_5+K_2O>P_2O_5+K_2O$. 5. On the whole, alfalfa yield by acid tolerant R. meliloti YA03 inoculation on hilly acid soil was enhanced with nitrogen application, and besides it appeared 44% higher with lime than without lime.
Summer stress is one of the serious problems on cool-season grass at the soccer fields in Korea during heavy rainy season. This study was conducted to intestigate the effect of shade net with regard to its percent (0, 50, 75), color (black, green), height (0 cm, 30 cm) and time (7 hr, 24 hr) on turf canopy temperature, light intensity, leaf color, turf performance, clipping yield and root dry weight of cool-season turfgrass. Turf canopy temperature was 6~13$^{\circ}C$ under black and green shade net when temperature was over 4$0^{\circ}C$. Light intensity was also decreased from 40 to 94% under black and green shade net compared to control. Black shade net was more effective than green net in reduction of temperature and light intensity. Green shade net was found to be better for photosynthesis of cool-season grass. Leaf color, turf performance, clipping yield, and root dry weight were better and increased under 50% and 75% shade net. 50% black shade net with 30cm height and 7 hr treatment showed the best turf performance. It can be concluded that 50% and 75% green shade net can be used fur reducing summer stress on cool-season grass after soccer marches during heavy rain season. The shade net decreased the turf canopy temperature and reduced heating damage of cool-season turfgrass.
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