Modern cultivation of grain crops. (1920 - 1929)
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Modern designs of disc plows.
Tractor with a plow.
Types of plowing.
Special machines for plowing and destruction of pests
Different types of planting.
Demonstration of machines for sowing.
Tractor "SS" at work in the field cultivator.
The first cultivation.
The second cultivation
SShA.Shema work cultivator.
The root system of cereal.
The value of the correct application of cultivators to improve soil structure
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