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Effects of Tetracyclines on Primary Root Length and Chlorophyll Contents of Vegetable Crops
Hyeonji Choe,Hadjer Chohra,Vimalraj Kantharaj,Mi Sun Cheong,Yong Bok Lee 한국토양비료학회 2021 한국토양비료학회지 Vol.54 No.1
By increasing the use of antibiotics, it is concerned that unexpectedly contaminated the effect of antibiotics occurs in agricultural soil. In this study, we investigated the impact of antibiotics on the early stages of crop growth using lettuce (Lactuca sativa), cabbage (Brassica campestris), and radish (Raphanus raphanistrum). These crops were grown on agar plates vertically without antibiotics (0 ㎎/L) and with tetracycline 5 (TC5), 10 (TC10), and 20 (TC20) ㎎/L, chlortetracycline 5 (CTC5), 10 (CTC10), and 20 (CTC20) ㎎/L, and oxytetracycline 5 (OTC5), 10 (OTC10), and 20 (OTC20) ㎎/L at 20℃ for five days. Root length of all crops inhibited in a concentration-dependent manner except for cabbage of OTC treatment. For lettuce, root length (㎝) showed an average 6.06 and 1.39 upon control (0 ㎎/L) and TC20, respectively. Similarly, cabbage and radish exhibited an average 7.20 and 5.47, respectively, without TCs whereas TC20 inhibits the root length down to 2.26 and 1.59, respectively. The chlorophyll contents of cabbage and radish reduced as increased antibiotic concentration. Interestingly, chlorophyll contents of lettuce did not show significantly different. Therefore, we suggest future research directions by showing the effect of antibiotics on crops.
Evaluation of the Crop Yield and Nutrient Balance by Application of Liquid Manure in Paddy Soil
Young Eun Yoon,Hyeon Ji Choe,Vimalraj Kantharaj,Mi Sun Jeong,Yong Bok Lee 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.2
The purpose of this study was to evaluate the effects of liquid manure to increase the yield of green manure in winter season, and to investigate the effect of green manure incorporation to increase the yield of maize grain and nutrient balance improvement in upland soil. The green manure used in this experiment was barley and hairy vetch with a mixed ratio of barley and hairy vetch (75:25), respectively. Liquid manure applied 0, 26, 52, 78, and 104 Mg ha<SUP>-1</SUP>, respectively, and the half of the total amount was applied as basal fertilizer, and the other half was topdressing. Nitrogen inputs through liquid manure were 0, 7.1, 15.6, 21.5 and 28.4 kg ha<SUP>-1</SUP>, respectively, and the phosphorus inputs were 0, 11.3, 22.6, 33.9 and 45.2 kg ha<SUP>-1</SUP>, respectively. The yield of green manure crops increased significantly with the increase of liquid manure application, but the yield of hairy vetch decreased. In the summer season, the green manure crops were incorporated, and the compost was used in the conventional treatment. The yield of maize grain increased with increasing green manure yield. The yield of maize grain of green manure crops incorporation treatments was up to 81% compared to conventional cultivation treatment, however the two-year experiments showed an increase on maize grain yields in green manure incorporation treatment. In addition, the incorporation of green manure crops greatly improved the phosphorus balance in compared to conventional cultivation. Therefore, productivity improvement of green manure crops by utilizing liquid manure is thought to have significantly contributed to the improvement of maize grain yield and nutrient balance.
Young-Eun Yoon(윤영은),Hyeon Ji Choe(최현지),Kantharaj Vimalraj(칸타라즈 비말라즈),Chohra Hadjer(쇼흐라 하젤),Mi Sun Cheong(정미선),Young-Nam Kim(김영남),Yong Bok Lee(이용복) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
As a flavone glucoside, Saponarin is the primary functional compound found in barley sprouts (Hordeum vulgare L.). It appears that saponarin production occurs mainly in the primary barley leaf and varies considerably with environmental factors, i.e. climatic conditions. To obtain high yield of saponarin, it is essential to find the optimal environmental conditions for growing barley sprouts. In the present study, we conducted field experiments to investigate the effects of variation in climatic conditions with different sowing times on the saponarin content of barley sprouts. As a result, there was no effect of a difference in sowing time on the fresh weight (FW) of the sprouts, but their growth period (GP) indeed varied with the sowing time. In both sites, the higher saponarin concentration was found in the sprouts sown in spring (March to May) and autumn (September to October) than in summer (May to August). Also, according to the correlation analysis, saponarin concentration had positive correlations with daily temperature range (DTR) and average light period (ALP), negative correlations with FW, leaf length, growth index (GI), average daily temperature (ADT), accumulated temperature (ACT), relative humidity (RH), and rainfall. The results indicate that the daily temperature difference and daylight hours may be determinant factors on saponarin biosynthesis. In addition, the polynomial relationship between saponarin yield and leaf length showed that barley sprouts would produce the highest saponarin yield at an appropriate 16 cm length. The outcomes of this study suggest the optimum sowing seasons that have more significant climatic factors such as daily temperature difference and daylight hours, contributing to a high quality of barley sprouts with high saponarin content.