The use of ring harrow at broadcast sowing

Abstract

Results are given from an investigation into the work of the battery of the Leader BKS-12.8 harrow’s tools with regard to quality of field treatment, combing out the weeds and embedding the seeds in the soil at broadcast sowing with ring harrow. Experiments were carried out in the experimental field of Novosibirsk Region. There are given the equations, which allow determining a distance of soil movements by the ring of the ring harrow battery depending on an angle of attack of the battery, speed of the unit, a diameter of the ring, and an angle of the descent of soil from the ring. It has been established that the angle of attack of the battery and speed of the unit mostly influence movement of soil by the ring of battery. Movement of soil occurs through movements of the rings of the battery from the last ring to the first. As a result, the excessive soil is formed before the first ring, and the part of it is removed by the last ring of the previous battery with forming a furrow and a small ridge of 3-4 cm. At the 2.8 m/c operating speed of the unit, such a weed as chicken panic grass is up to 68.55% removed. When embedding the oat seeds with harrow, 662 plants of 950 viable seeds were emerged that made up 69.68%. Embedding the seeds to the depth of 1 to 3 cm gave 79.8% of the number of emerged plants. The sowing of grain crops and rape by the broadcast method with ring harrows against untreated backgrounds allows obtaining good sowing quality with simultaneous combing out the weeds, leveling of soil surface and preserving moisture under the cover of the mulching level created by rings of the harrow.