## Calibrating Fertilizer Applicators

Fertilizers, which are mainstays of modern agriculture, are applied in liquid, gaseous, or granular form. In this section we will discuss the calibration of granular FIGURE 8.1. Broadcast fertilizer spreader. FIGURE 8.1. Broadcast fertilizer spreader. applicators. The application of liquid fertilizers follows the same principles as spraying chemicals and sprayers are discussed in a separate section. Gaseous fertilizers require specialized equipment and are very hazardous to use. The equipment...

## Stationary Calibration

Both bulk and singulating row crop planters can be calibrated stationary by following the procedure used for stationary calibration of fertilizer applicators and grain drills. When the stationary method is used, the seeding rate is calculated by dividing the seeds planted per revolution of the drive wheel by the simulated acres covered per revolution of the drive wheel, when the stationary method is used or This equation can also be written as where R seeding rate (seeds ac) sd number of seeds...

## Converting Tractor Power Ratings

Manufactures can use anyone of the four power ratings to advertise their tractors. When manufactures use engine or brake power to rate a tractor they are not providing any useful information because the useable power will be less than that. When the tractor is rated by engine or brake power, the PTO power will be less because of the losses in the power train. The drawbar power will be less because there are additional losses in the transmission and drive train and a tractor is not able to apply...

## Equations and Formulas

Equations and formulas are very similar problem-solving tools. Some texts study them separately, but in this section they will be combined. Equations are a way of showing the relationship between different variables in a problem and are usually derived as needed for each problem. Formulas are equations that are used frequently enough or are some how unique enough that they are remembered and used without a derivation. The solution to some problems requires the derivation of a mathematical...