KL 2500/3000
28
the correct sowing depth is 1 - 3 cm based on the sowed plant and ground humidity
conditions. The sowing depth between grains may vary between 2.5 - 5 cm. As with all
plants, it is essential that sowing is performed on humid, level ground in order to ensure
sprouting. Become acquainted with the conditions appropriate for different plants and
their sowing depths with the help of guides and study materials.
The tractor must be equipped with wheels suitable to ensure that the surface pressure
remains low enough to avoid compression or tire grooves.
Driving speeds must be adapted to conditions. At excessively high driving speeds, the
coulters may bounce and rise from the set sowing depth. Sufficient coulter spring
loading will secure the coulters to the ground.
On light and moist terrains, the coulter working depth can be limited by using disc
coulters, which are equipped with a limiting cup on the disc. In light tillage conditions,
where managing tillage depth may already cause problems, disc coulters may also be a
suitable choice to prevent excessively deep sowing. Adequate moisture should be
ensured so that the seeds are not planted in a ground layer which is either too dry or too
loose.
Setting the sowing depth
As noted above, the sowing depth is to a major degree determined by tillage depth.
Changing the coulter spring loading can significantly impact the sowing depth. On light
grounds and when sowing at shallow depths, the spring loading should be kept low, and
increased on more solid terrain. Correct coulter weighting must always be ensured
under practical conditions and the seed placement in the tillage layer must be observed.
The coulter spring load can be adjusted either coulter-specifically or by using central
adjustment. Coulter loads against the ground can be adjusted between 2 and 20 kg.
The respective operating depth is dependent on the coulter type, tillage and soil type.
Sowing depths should always be checked under actual conditions, and it should be
ensured that the seeds are sown into a moist soil layer.
Sowing depth adjustment can be performed most conveniently by means of the main
adjustment screw, located in the center of the rear of the machine, see Fig. 15. Rotating
the crank clockwise will increase the coulter weighting.
