Precautions to improve herbicide efficacy

Note that the right choice according to crop and weed herbicide right choice herbicides. If Tribenuron for wheat in the northern broadleaf weeds , grass weeds good effect on wheat relatively safe , but if it will be used on crops such as rapeseed fields produce injury , and even death rapeseed .

Note that the selected medication suitable period of nature according to herbicides , weeds occurred during the selected medication timing. Soil treatment medication, such as acetochlor in crops after sowing , pre-emergence weed medication, can increase efficacy ; seedling foliar treatment medication should be in before the 2-leaf stage of weeds and crop 2 leaf stage after medication. In addition, some will be affected by the level of herbicide efficacy light , temperature, soil moisture effects, such as glyphosate and other high efficacy in the sun is strong , it should choose a sunny spraying ; Chlortoluron , dicamba , etc. at 5 ℃ the following herbicidal effect is poor, it should be avoided before and after cold medication ;perfume sprayer acetochlor herbicide in the soil humidity, good effect, if the drought, irrigation or rainfall should be after the spraying.

Note pharmaceutical formulation and application techniques to improve WP watered administered , can be washed with a small amount of water to preweighed medicament into a paste, then pour the sprayer , then add the right amount of water to mix. Special small amount ( about 1 gram per acre ) , plus a small amount of water should be first dubbed Pharmacy liquor , into sprayer , add water and mix thoroughly diluted to the desired concentration . Liquid herbicides should first spray by adding a certain amount of water, then add the additional dose, and then injected into the water to be added and stirring plus side . Use clean water liquid preparation, such as glyphosate added easily mud muddy water adsorption passivation agents , reduce the efficacy. Mu water generally 30 to 45 kg is appropriate . When spraying should also pay attention to the frequency of the hand pressure sprayer , human walking speed , nozzle height remained the same ,portable sprayers and each spray pattern width to be the same , to avoid re-spray , leak spray , spraying should be careful not to let drugs fog drift to other neighboring crops .

Note mix , alternating the use of herbicides with herbicides used continuously for many years , easily lead to resistant weeds , so herbicides only mixed-use and inter-annual used interchangeably in order to achieve the purpose of long-term control of weeds .