New evaluation method for the longitudinal distribution of seed drills in operation for the first time the DLG test centre

摘要

The Hohenheim University optosensor used allows direct simultaneous longitudinal distribution measurements on seed drills. However, the measurable seed and frequency spectrum is limited. The time consumed by such measurements is comparatively short. Relatively fine distinctions between the results are possible in the measuring range, but these probably do not result in any measurable increase in benefit during drilling in the field and are frequently over interpreted. Repeat trials can be carried out with little additional expenditure. However, due to the uni-dimensional construction, the system can only determine the spot at which a seed drops longitudinally. Research is currently in progress at Hohenheim University into a two-dimensional version of the optosensor, to record grains falling covertly with shares barely scattering the seeds. This further development will also allow the lateral scatter of the drilling shares to be surveyed, and thus provide an indirect comment on the expected regularity of the deposit depth. According to the DLG Utility Value Test for seed drills the uni-dimensional optosensor used constitutes an interesting approach to a solution regarding longitudinal distribution measurements in the laboratory, but cannot yet replace the seed hopper channel for all kinds of seeds and all types of shares. Finally, the optosensor does not make practical field trials obsolete, as the influence of disruptive factors associated with machines and soil is to be tested specifically here.