Appropriate choice of spray droplets and density. Spray "Bi care," to be considered in the production of both the meteorological conditions ( such as evaporation , drift , wind ) and other effects , but also consider the sprayed droplets on the plant leaves a certain residence time in order to facilitate penetration , absorption, water power sprayer spray droplet less than 200 microns in diameter , vulnerable volatilization drift losses affect the efficacy , spray droplet diameter greater than 500 microns is difficult in plant leaves sticking , easy to tumble to the ground , reduced efficacy . Suitable spray droplet diameter of 250 microns to 400 microns , droplet density of 30 to 40 per square meter .
According spray droplet diameter and droplet spray volume density options . Using manual and motorized knapsack sprayer Mist Sprayer spray " Pitt guard " of spray volume per acre 15 kg to 20 kg of water . With a boom sprayer spray " Pitt guard " spray volume of 10 kg to 15 kg / mu ; aircraft spray volume 2 kg to 6 kg / mu , according to the characteristics of agricultural aircraft spray volume determined . Droplet spray stalk crops according to size and density to determine the amount of ejection .
Meteorological conditions . Spray "Bi protection of" optimum temperature is 13 ℃ ~ 27 ℃, relative humidity greater than 65% , wind speed is less than 4 m / s ; generally sunny 9:00 until 16:00 and night after liquid sprayer spraying operations without dew best . Temperature is too low or high temperatures slow metabolism crops under drought conditions , will reduce the "Bi care ," the absorption and conduction velocity , affect the efficacy of the play.
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