Hexazinone Residue Analysis And Application In Hickory Forest

Hexazinone triazine herbicides are, Destuctive relatively strong, can effectively controlweeds (irrigation), especially for miscellaneous bamboo has a good control effect, andhexazinone right hickory have some resistance. Hickory forest land and forest between theoften complex irrigation and other vegetation to hazards, particularly miscellaneous bambooroot system, complex and difficult to eradicate, seriously affecting the hickory industry,hickory production has become a prominent issue. How to hexazinone applied for tending andhickory forest plantation cleaning, and determine its application in hickory woodlandformulations, dosage, control effects such as application technology, and conduct safetyevaluation for further Hexazinone promote the use and cultivation of hickory production has avery important significance.1. A hexazinone residue analysis method was established in hickory (Carya cathayensisSarg.) plants, fruits and soil. The process was as follows:(1) The detection effect is better at awavelength of254nm by UV spectrophotometer.(2) The plants were detected bychromatographic column (Thermo ODS,250×4.6mm,5μm), where mobile phase elutionwas water/formaldehyde (41/59, V/V) and the flow rate was0.8mL/min. The chromatographicretention time for hexazinone was9min, and the separation effect is good. The mobile phaseelution was water/acetonitrile (45/55, V/V) for hickory nuts and soil detection, and the retentiontime was7min. The linear regression equation on residues detection: Y=4.5569X-0.4761(R2=0.9978).(3) For the extraction agent of hexazinone residue determination: ethyl acetate waschosen in plant determination, and ethyl acetate plus formaldehyde was chosen in soildetermination, and chloroform was choosen in hickory nuts determination.(4) Neutral aluminawas used as column chromatography media.(5) Hexane plus different volume ethyl acetatewas used as lotion.2. In field application, hexazinone decline dynamics, the last residues were analyzed inhickory plants and soil. The adsorption of hexazinone was studied by batch equilibrium experiment. The results were shown as the following:(1) Hexazinone has a different influenceon bacteria, fungi and actinomycetes in soil. The impact was enhanced as the dose increasedwhile weakened as time increased.(2) The decline rate was44.3%after1day and76.81%afer2days, and reached more than90%after10days in hickory plants; the decline rate was64.11%after4days and over90%after10days, and reach99.09%after18days in soil. Itsdecline dynamics matches with the first-order kinetic model.(3) Leaching ability ofhexazinone was strong in soil. After30days, hexazinone average concentration was171.1ug/kg in0-30cm soil layer,97.3ug/kg in30-60cm soil layer, and67.9ug/kg in60-120cm soillayer. Hexazinone content in soil layers reduced after60days, and cannot be detected after120days.3. The5%hexazinone granules and25%hexazinone agent with different dosages anddifferent application methods were used to control weed (shrub) in hickory forest. The resultsshowed that they had a good effect on weed (shrub) control. Broadcasting5%hexazinonegranules (3000g a.i./hm~2) mixed with soil at the ratio of1:5or spraying25%hexazinoneagent (3000g a.i./hm~2) mixed with water realized the weed control effect of over97%, whichindicated the suitable application method and dosage. The cost of the two weeding ways is only33%of artificial weeding.