环庚草醚气相色谱分析方法

采用气相色谱法,5％OV－101填充柱和氢火争离子化检测器,以邻苯二甲酸二丙酯为内标,对环庚草醚进行定量测定,该方法简便,快速,准确,实用,标准偏差为0．73,变异系数为0．81％,回收率为98．99％－100．51％。     

环庚草醚防除稻田杂草的试验研究

在秧苗移载后５天，每公顷用１０％环庚草醚乳油３００毫千，或１０％环庚草醚乳油１５０毫升＋１０％苄嘧黄隆呆湿性粉剂２２５克，用毒土不撤施，对水稻本田中的稗草、牛毛毡、异型莎草、鳢肠、丁香蓼等杂草的防效可稳定在９０％以上，且在此剂量下，对水稻及下麦子是安全的。     

桉树脑类除草剂环庚草醚的合成

α－蒎烯与硫酸反应，给出１，４－桉树脑。再与锂、１，３－丙二胺反应，得萜品－４－醇，再气化后，与α－甲基氯苄反应得到环庚草醚。     

Natural products phytotoxicity A bioassay suitable for small quantities of slightly water-soluble compounds

A large variety of secondary metabolites that can inhibit germination and/or seedling growth are produced by plants in low quantities. The objective of this study was to develop a bioassay capable of reliably assessing reductions in germination percentage and seedling length of small-seeded plant species caused by exposure to minute quantities of these compounds. The germination and growth of alfalfa (Medicago saliva), annual ryegrass (Lolium multiflorum), and velvetleaf (Abutilon theophrasti) were evaluated against six known phytotoxins from five chemical classes; cinmethylin (a herbicidal cineole derivative) was selected as a comparison standard. Each phytotoxin, dissolved in a suitable organic solvent, was placed on water-agar in small tissue culture wells. After the solvent evaporated, imbibed seeds were placed on the agar; after three days, germination percentages and seedling lengths were measured. Compared to a commonly used filter paper procedure, this modified agar bioassay required smaller quantities of compound per seed for comparable bioassay results. This bioassay also readily permitted the measurement of seedling length, a more sensitive indicator of phytotoxicity than germination. Seedling length decreased sigmoidally as the toxin concentration increased logarithmically. Phytotoxicity was a function of both compound and plant species. Cinmethylin, a grass herbicide, reduced the length of annual ryegrass seedlings by 90–100%, whereas that of alfalfa and velvetleaf was inhibited slightly. The agar bioassay facilitated the rapid and reliable testing of slightly water-soluble compounds, requiring only minute quantities of each compound to give reproducible results.The mention of firm names or trade products does not imply that they are endorsed or recommended by the U.S. Department of Agriculture over other firms or similar products not mentioned.