Grain Guide 2018

GRAIN GUIDE 2018 Steps to calibrate for spraying  Now calculate the correct volume of herbicide to be added to the spray tank: Jan de Villiers, Ficksburg If you want to calibrate for spraying quickly, follow the steps below (for overall spraying):  With the spray pressure set at the desired level, measure the amount of water delivered by each spray head in the time period as determined in Step 1. 1 5 7 4 6 2 3  With the aid of the above information, calculate the spray volume per hectare: Decide in which gear and at what engine revolutions you intend spraying with your tractor. Fill the tank with water and then determine the time it will take for the tractor to travel 100 m in the field.  Make sure that the sprayer is fitted with the right spray heads. With the tractor stationary, switch on the pump and adjust the spray pressure to the desired level and at the same engine revolutions as in Step 1.  Measure the total spray width of the sprayer. Spray volume = 10 000 x total volume of water (litres) (as determined in Step 3) distance (100 m) x sprayer width (metres)  If the desired spray volume is not obtained, repeat Steps 1 to 5 with different gear combinations until the desired volume per hectare is applied. content of tank x herbicide dosage/ha = spray volume/ha (as determined in Step 5) Volume of herbicide to be added to tank 92 Pest control