Principles of operation of fertilizer seeders.
Before starting work, each fertilizer drill should be set to the desired sowing quantity per hectare. The sowing adjustment units are set according to the table provided in the seed drill operator's manual. The amount of fertilizer actually sown by the seeder is checked by making the so-called. shot test. For this purpose, the drill is driven when stationary and the amount of fertilizer spread out onto the sheet is weighed. If the quantity of fertilizer weighed after the test is different from the desired quantity, then the setting of the sowing rate regulating units should be changed accordingly, according to the type of seeder - according to the notes in the operator's manual. If the fertilizer is moist and lumpy, then it should be crushed in a special grinder or grinder.
The attempt must be repeated as long, until by changing the width of the sowing slot or the gear ratio of the gears in the drive system, the amount of fertilizer to be sown is close to the desired. The acceptable deviation from the norm is 3-5%. Similar calculations can be made for any other seeding rate per hectare when operating in second or fourth gear of the tractor. During the seed drill test in the field, the specified amount of fertilizer should be poured into the seed drill box and checked, by measuring the area sown, whether it corresponds to the required field area according to the seeding standard.