http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.