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Determination of forchlorfenuron Dissipation and Residue in Cucumbers and Red Soil

Journal of Northeast Agricultural University(English Edition) 2010年第1期17卷 27-31页

作者： LIU Qiang GONG Daoxin PENG Xiaochun YAN Xiaojun College of Resources and Environment Hunan Agricultural University Changsha 410128 China South China Institute of Environmental Science Ministry of Environment Protection Guangzhou 510655 China

To assess the risks of forchlorfenuron after application, a residue analysis method for ferchlorfenuron in cucumbers and the red soil of Southern China was established, and the dissipation behavior and residue characteristics of forchlorfenuron were studied under field conditions. The field trials, including dissipation and residue experiments, were conducted in Hunan, Yunnan and Hainan Provinces. forchlorfenuron was applied at 32 a.i.g ha^-1 rate for the dissipation study and both 21 and 32 a.i.g ha^-1 for the residue study. Representative cucumbers and soil samples were collected at predetermined intervals for HPLC for UV- detector analysis. The average recoveries of the method were 80.8%-92.0% with coefficients variation （CV） between 0.4% and 11.8%. The detection limit of forchlorfenuron in cucumbers and soil samples was 0.003 mg·kg^-1 and the minimum detectable amount was 3.0× 10^-10 g. The half life of forchlorfenuron in cucumbers in the three provinces changed as： Yunnan （5.50 days）, Hunan （5.88 days）, and Hainan （6.53 days） and in the soil was observed： Hainan （6.54 days）, Hunan （7.64 days）, and Yunnan （8.39 days）. The maximum terminal residue in cucumbers at 32 a.i.g ha^-1 rate after 5 days was 0.009 mg·kg^-1 （Yunnan） followed by 0.0085 mg·kg^-1 （Hainan） and 0.0082 mg·kg^-1（Hunan） which was below MRL value of 0.01 mg·kg^-1 established by the USA, EPA. So a waiting period of 5 days should be established after spaying on cucumbers to avoid hazard to human beings.

关键词： forchlorfenuron dissipation residue HPLC cucumber soil

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An efficient method in breaking of dormancy from Bunium persicum(Boiss)Fedtsch seeds:a valuable herb of middle East and Central Asia

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Asian Pacific Journal of Tropical Biomedicine 2014年第8期4卷 642-649页

作者： Yousef Emamipoor Mahmood Maziah Department of Natural Resources Agricultural and Natural Resources Research Center***KermanIran Faculty of Biotechnology and Biomolecular Sciences Universiti Putra Malaysia43300SelangorMalaysia

Objective:To develop a protocol lor breaking of seed dormancy and increasing the seed germination rate of Bunium ***:The seeds were treated with 3.***.6.3.12.***.25.50 and 100 μmol/L of benzyl *** acid(GA,),thidiazuron(TDZ) and ***,seeds were transferred to two different temperature conditions including room temperature(25 ℃) and chilling temperature(2-5℃).Results:The treatment of moist seeds with chilling temperature(2—5℃) broke seed dormancy and showed maximum germination,which was 54.7%after 60 d ***,the treatment of dn seeds with chilling temperature broke seed dormancy with 9.3%germination rate after 120 *** of seeds with different level of plant growth regulators showed that under moistroom condition,there was evidence ol higher and lower seed germination rate:GA,(100 μmol/L)with 46.7%and TDZ(50 μmol/L) with 6.67%*** addition,the results showed that under moist-chilling ***(6.3 μmol/L) with 53.3%seed germination rate had higher influence on breaking seed *** of seeds with combination of TDZ and GA_3 under moistchilling condition revealed higher rale of breaking of seed dormancy when 6.3 μmol/L TDZ was combined with 100 μmol/L GA,.showing 93.7%genninatiou ***:The effect of plant growth regulators coupled with chilling temperature on breaking of seed dormancy could provide a large number of seedlings while the long juvenile time which is the next restricting factor of plantation still ***,the subsequent growth of seedlings to provide a large number of corms is necessary for successful plantation.

关键词： Bunium persicum Seed germination Thidiazuron Benzyl aminopurine Gibberellic acid 3 forchlorfenuron Chilling temperature

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