S. MANDRADZHIEV and D. KEHAYOV
Agricultural University, BG - 4000 Plovdiv, Bulgaria
MANDRADZHIEV, S. and D. KEHAYOV, 2008. Examination of a plough with increased working width of the last plough body. Bulg. J. Agric. Sci., 14: 108-112
The basic agro technical requirement for the ploughs is that they should turn over the soil layer. Through turning over the soil, the upper soil layer with damaged structure is found at the bottom of the furrow, while the lower layer with restored structure – on the surface. The widely used plough bodies with cylindrical form are not able to meet this requirement to a large extent. For this reason, the researchers’ attention is turned towards the improvement of their technological characteristic features.
Plough PNO-2-35 has been examined, which has last right-turning plough body with higher working width for ploughing in 0.20 m depth. It has improved technological characteristics. By increasing the working speed of the plough from 2 to 6 km.h-1, the sloping angle of the soil in relation to the horizon, the width of the furrow bottom and the tilling of the weeds, increase from 34° to 42°, from 0.36 to 0.40 m and from 95 to 100% respectively, while the crest height decreases from 0.14 to 0.03 m. The increase of the working speed of the plough within the abovementioned limits causes increase of the degree of turning over the upper half of the soil layer from 45% to 88.5%.