Trinexapac-ethyl

Trinexapac-ethyl is a plant growth regulator used to prevent lodging in cereals and oilseed rape. Other uses 

A water sample (500-mL) is acidified to pH 3 with HCl and mixed with 20 mL of saturated NaCl solution. The sample is extracted via liquid/liquid partitioning into methylene chloride (3 x 50 mL). The combined methylene chloride fraction is reduced to dryness via rotary evaporation and the residue reconstituted in water-ACN (3 1, v/v). The final determination is performed using HPLC/UV with a two-column switching system. 

For air analysis, a known volume of air is passed through a sampling cartridge for a preset period of time. The cartridge is eluted with methanol and reduced to dryness prior to reconstitution of the residue in 10 mL of water-ACN-85% phosphoric acid (700 300 1, v/v/v) solvent mixture. Residue determination is carried out using HPLC/UV at 280 nm. 

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Trinexapac-ethyl decomposes to its acid form in acidic or basic aqueous solution and is light sensitive. Samples should be analyzed immediately or stored in the dark until analysis... 

Stock solution. Prepare a 200- ug mL stock solution in ACN Fortification solutions. Prepare 0.04 and 0.2 lagmL fortification solutions by dilution of the stock solution in acetonitrile (trinexapac-ethyl). Prepare 0.05 and 0.25 j.gmL fortification solutions by dilution of the stock solution in water (trinexapac). 

The amount of trinexapac-ethyl or trinexapac residue, R (ngg ), in the sample is calculated by the following equations ... 

Sugar accumulation Cu-ethylenediamine Ethylene, ethephon MBTA-HCl Phospholipids Trinexapac-ethyl... 

Winter barley partienlarly ean be susceptible to lodging. Stiff-strawed varieties should be ehosen. To eontrol lodging in winter barley, chlormequat is not as effective in barley as in wheat products containing 2-chloroethylphosphonic acid or trinexapac-ethyl can be nsed. The later applications will control necking and... 

Oats can be very susceptible to lodging. Choose a stiff-strawed variety and/or apply a PGR in high risk situations. Chlormequat formulations are useful in preventing lodging if applied at GS 32, as is trinexapac-ethyl at GS 30-31. 

Rye is a very competitive crop with good disease resistance so inputs tend to be lower than for other cereals. A limited range of grass and broad-leaved hetbicides is available (Table 13.6 and Table 13.7) there are a few chemicals with EAMUs in rye. Because rye is tall and often weak-strawed, a growth regulator is required, e.g. ehlormequat (GS 30-31) or trinexapac-ethyl at GS 30-32 or 2-chloroethyl phosphonie acid at late stem extension. 

Triticale is a mnch lower input crop than winter wheat and some varieties of triticale can be qnite weak-strawed, particularly on less droughty soil. The growth regulators such as chlormequat, 2-chloro-phosphonic acid and trinexapac-ethyl will reduce lodging. 

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