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생강 근경부패병의 발생 생태 및 토성 , 토양화학성 및 토양 생물성과의 관계
이왕휴,이두구 ( Wang Hyu Lee,Doo Ku Lee ) 한국환경농학회 1998 한국환경농학회지 Vol.17 No.1
The ecology of rhizome rot incidence rates between Seosan, Chungnam and Bongdong, Chonbuk province were surveyed in this experiment. The rhizome rot incidence rate of Seosan was lower than that of Bongdong. The average ginger product of former province was 1,140㎏, whereas it`s 818㎏ per 10a. in latter province. Treatment after disease incidence frequently used fungicide at Seosan. There were different soil physiological property between fields. Although Eunhari and Yulsori were belong to Bongdong province, incidence rate was low at Eunhari, contained 23% clay and high incidence rate at Yulsori, approximately contained 60% silt. Many soil chemical properties of cultivated area were belong to optimum concentration range, but phosphate(P) was higher than optimum concentration, 450-550ppm. The number of soil fungi in the middle of cultivated season tended to show the highest. Both bacteria and actinomyces` number was similar to the result of fungi. The bacteria/fungi ratio was greatly different between surveyed fields.
Metalaxyl , Carbofuran , Samazine 을 처리한 밭토양에서의 미생물수의 변동
이왕휴(Wang Hyu Lee),김주희(Ju Hee Kim) 한국환경농학회 1998 한국환경농학회지 Vol.17 No.3
The effects of metalaxyl(granule), carbofuran(granule) and simazine(water soluble powder) on the soil microflora were conducted at field soil between Iksan and Chonju province. Pesticides were divided into 0.5, 1, 1.5 and 2.0 times of normal of field, respectively. The number of fluorescent Pseudomonas was ranged from 10³to 10^6/g in both field soil treated with cabofuran. Pseudomonas concentration of Chonju field soil slowly increased and approached the maximum level at 56 day after treatment(DAT). It showed the higher at 14DAT than other DAT in Iksan field soil treated with metalaxyl or simazine, whereas it increased again at 112 DAT in metalaxyl treatment. Cabofuran treatment of both field soil showed maximum Pseudomonas number at 28 DAT compared to that of other treatments. In Chonju field soil, those Pseudomonads of metalaxyl and simazine treatment increased the highest level at 7 DAT. Simazine treatment decreased it`s number from the beginning of experiment. In both soil, metalaxyl treatment decrease the general fungi number at 7 DAT, but increase at 14 and 56 DAT in Iksan field soil. However it increased at 56 DAT in Chonju field soil. Cabofuran treatment of Iksan field soil tended to decrease general fungi number at 28 DAT, but was ranged from 1.0 to 8.6×104/g for the rest of experimental period. It started to increase at 56 DAT simazine treatment of Iksan. General bacterial concentration both soil treated with cabofuran was belong to 26.6∼29.6×106. It was the highest at 56 DAT, but was not significantly different. General actinomyces number was highly increased at 7 and 112 DAT compared to that of other DAT. Pseudomonas putida or P. fluorescens from both field soil was separated and identified 10 to 30 of all 104 Pseudomonas, respectively. All isolated microorganisms showed chemical resistance of 100ppm metalaxyl, cabofuran and simazine treatment
이왕휴 ( Wang Hyu Lee ),김주희 ( Ju Hee Kim ),최인영 ( In Young Choi ) 전북대학교 농업과학기술연구소 2008 농업생명과학연구 Vol.39 No.2
Crop plants are infected by various pathogens, and farmers apply many control measures to counter the invasions. Among these tactics, various control methods exist with their own distinctive advantages and disadvantages. It is a proven fact that biological control is safer than to chemical control in the production of food products. As a benefit of biocontrol there are no residual problems, as it has an alternative effect on the resistant pathogens or insect pest which tend to resist chemical control after numerous applications. If treatment takes place in the seeds of plants, the effects remain at the rhizosphere as long as the plant survives. It is an essential aspect of organic agriculture. However, biocontrol is expensive and less effective and disproportionate than chemical control. Moreover, the effect of biocontrol is degraded if the proper application period is missed and little research has been conducted on the safety of the biological agents in the other advanced countries. Therefore, just like other control programs, a safety guide line for using bio-agents in biocontrol programs is also necessary in Korea. Conclusively, since under current circumstances where the self sufficient production of agricultural products has not yet been achieved, a combination of control tactics, such as the integrated control and IPM (integrated pest management) have to be applied without relying on one individual control method to achieve safety in the production of our food products.