Growth of Lettuce and Young Radish and Changes of Soil Chemical Properties after Application of Soldier Fly Compost (original) (raw)
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2011
This study was conducted to compare the growth of Zoysia japonica depending on different soil treatments in Saemangeum sea dike, which is filled with dredged soil. Zoysia japonica was planted using sod-pitching method on the control plot. On plots which were treated with forest soil and soil improvement, Zoysia japonica seeds were sprayed mechanically. Sixteen months after planting, coverage rate, leaf length, leaf width, and root length were measured and analyzed. Also, three Zoysia japonica samples per plot were collected to analyze nutrient contents. Coverage rate was 100% in B treatment plot(dredged soil+ soil improvement+forest soil), in C treatment plots (dredged soil+ soil improvement+forest soil), and D treatment plots (dredged soil+ soil improvement), while only 43% of the soil surface was covered with Zoysia japonica on control plots. The width of the leaf on C treatment plots (3.79mm) was the highest followed by D treatment (3.49mm), B treatment (2.40mm) and control plots...
Korean Journal of Soil Science and Fertilizer, 2018
Long-term monitoring of soil chemical properties is the main agricultural practices to improve crop yield and soil fertility. Field monitoring was performed to evaluate the chemical properties of 200 greenhouse soil samples every 4 years from 2000 to 2016 in Gyeongnam province, South Korea. Soil properties such as pH, electrical conductivity (EC), amount of organic matter (OM), available phosphate (P 2 O 5), nitrate nitrogen (NO 3-N), exchangeable potassium (K), calcium (Ca), magnesium (Mg), and sodium (Na) were analyzed. In 2016, the average concentration of soils under greenhouse condition showed 6.8 for pH, 3.52 dS m-1 for EC, 40 g kg-1 for OM, 1,065 mg kg-1 for P 2 O 5 , 154 mg kg-1 for NO 3-N, 2.35 cmol c kg-1 for K, 12.8 cmol c kg-1 for Ca, 4.0 cmol c kg-1 for Mg, and 0.91 cmol c kg-1 for Na. In addition, the average concentrations of OM, K, Ca, and Na have tended to increase with year. In 2016, the frequency distribution of excessive level of soils under greenhouse condition was 43% for pH, 61% for OM, 94% for P 2 O 5 , 89% for K, 96% for Ca, and 83% for Mg. Soil EC values of green pepper, tomato, and lettuce were significantly higher than those of carrot, strawberry, and squash (p < 0.05), whereas soil pH was significantly lower in the carrot and lettuce than that in the strawberry (p < 0.05). Soil pH was significantly correlated with the EC, NO 3-N, K, Ca, Mg, and Na. The value of EC was also positively correlated with the OM, P 2 O 5 , NO 3-N, K, Ca, Mg, and Na. In conclusion, the long-term information on soil chemical properties will be helpful to improve sustainable soil and nutrient management for greenhouse farming.
Analysis of Bacterial Spot Disease in Red Pepper Caused by Increase of CO2 Concentration
Microbiology and Biotechnology Letters, 2018
An increase in CO 2 will affect plant pathogenic microorganisms, the resistance of host plants, and hostpathogen interactions. This study used Capsicum annuum and Xanthomonas euvesicatoria, a pathogenic bacterium of pepper, to investigate the interactions between hosts and pathogens in conditions of increased CO 2 concentrations. Our analysis of disease resistance genes under 800 ppm CO 2 using quantitative RT-PCR showed that the expression of CaLRR1, CaPIK1, and PR10 decreased, but that of negative regulator WRKY1 increased. Additionally, the disease progress and severity was higher at 800 ppm than 400 ppm CO 2. These results will aid in understanding the interaction between red pepper and X. euvesicatoria under increased CO 2 concentrations in the future.
Low glutelins Rice, Mid-late Maturing Variety ‘Geonyangmi’
2014
Geonyangmi, low glutelins rice cultivar, was developed by the rice breeding team of National Institute of Crop Science (NICS), RDA in 2011. This cultivar was derived from the cross between Jinmi TR and LGC-1 in 2003 summer season, and selected by a promising line, SR29355-B-51-2-2-1, was selected and designated as the line of Suweon533 in 2009. The local adaptability test of Suweon533 was carried out at three locations from 2009 to 2011 and it was named as Geonyangmi. This variety is a mid-late maturity cultivar. This variety has 90 cm in culm length and 124 spikelets per panicle. Its 1,000 grain-weight of brown rice is 19.3 g which is less than that of Hwaseonbyeo. This variety has tolerance to unfavorable environment such as cold. This variety has translucent and clear milled rice kernel without white core and belly rice. It has low glutelin content compared with Jinmibyeo. This variety is susceptible to leaf blast, bacterial blight, virus disease and insect pest. The yield potential of Geonyangmi was about 4.93 MT/ha at ordinary fertilizer level in local adaptability test for three years. This variety would be adaptable to the plain paddy field of middle of Korea.
Effects of Heavy Metal and pH on Bacterial Growth Isolated from the Contaminated Smelter Soil
Jihasutoyanghwan-gyeong, 2015
The contaminated soil at abandoned smelter areas present challenge for remediation, as the degraded materials are typically deficient in nutrients, and rich in toxic heavy metals and metalloids. Bioremediation technique is to isolate new strains of microorganisms and develop successful protocols for reducing metal toxicity with heavy metal tolerant species. The present study collected metal contaminated soil and characterized for pH and EC values, and heavy metal contents. The pH value was 5.80, representing slightly acidic soil, and EC value was 13.47 mS/m. ICP-AES analytical results showed that the collected soil samples were highly contaminated with various heavy metals and metalloids such as lead (183.0 mg/kg), copper (98.6 mg/kg), zinc (91.6 mg/kg), and arsenic (48.1 mg/kg), respectively. In this study, a bacterial strain, Bacillus cereus KM-15, capable of adsorbing the heavy metals was isolated from the contaminated soils by selective enrichment and characterized to apply for the bioremediation. The effects of heavy metal on the growth of the Bacillus cereus KM-15 was determined in liquid cultures. The results showed that 100 mg/L arsenic, lead, and zinc did not affect the growth of KM-15, while the bacterial growth was strongly inhibited by copper at the same concentration. Further, the ability of the bacteria to adsorb heavy metals was evaluated.
Journal of Agriculture & Life Science
Recently, efforts to utilize new and renewable energy for carbon neutrality were accelerated. In this study, in order to convert kenaf (Hibiscus cannabinus L.), one of the biomass crops, into fuel, pellets, which are solid fuels, were prepared by mixing unused wood resources and waste wood resources, and the quality was analyzed. In order to evaluate the quality, the standard of woody pellet, unused woody pellet and Bio-SRF. When compared the characteristics of pellets mixed with waste wood resources and pellets mixed with unused wood resources, it is judged that the mixed of waste wood resources affects nitrogen, ash and calorific value. When the quality standards were implemented based on the modeled pellets, most of the quality standards of wood pellets were satisfied under conditions of bulk 농업생명과학연구 56(3) pp.105-111