Using ethyl cyanoacetate, triethyl orthoformate and methylhydrazine as main raw materials, the herbicide pyrazosulfuron was prepared through the reactions of substitution, amination, cylclization, diazotization and chlorosulfonation.

The analysis of H9201 and pyrazosulfuron in mixture formulation by HPLC with C18 column using acetonitrile + water + acid as mobile phase and UV detector was introduced in this paper.

Effect of Pyrazosulfuron-ethyl on Microbiological Activity Related with N Transformation in Paddy Soil;

Through indoor simulation experiment,the influences of pyrazosulfuron-ethyl and quinclorac on soil respiration and activities of catalase,neutralphosphatase,urease and invertase in paddy soils were investigated.

The 21-day chronic toxicity test of butachlor,pyrazosulfuron-ethyl and bensulfuron-methyl to Daphnia magna was carried out according to "Standard Methods for the Examination of Water and Wastewater" by American Public Health Association and "Toxicity Test Methods" by China.

This paper study the synthetic route of fluoropyrimidinesulfuron, fluoropyrimidinesulfuron was synthesized from nitrateguanidine, diety1 malonate and sugar as starting reagent, which was subjected to five-step reaction, and with a total yield of.

The preparation method of the water dispersible granules of 80% nicosulfuron was introduced.

With the starting material of 2-chloropyridine-3-carboxylic acid, nicosulfuron was synthesized by seven steps including amidization, esterification, condensation and so on.

This paper reported the weed control efficiency ofnicosulfuron and its mixture With other herbicides in maizefields of the North of Jiangsu province.

In this paper a high performance liquid chromatographic method for the separation and determination of metsulfuron, bensulfuron and acetochlor in the composite herbicide “Nongjiayi” is described.

The results of field trials showed that 18% Daocaoling WP(mixture of acetochlor, bensulfuron and metsulfuronmethyl)at 225￣825g/ha against weeds in paddy gave good control effect for 92.