Figure 7 shows average fuel consumptions, where a considerable difference is obvious between the disk harrow and the other two implements, how much more fuel is consumed for cultivation in the older way, which is a piece of information very much in favour of circular self-cleaning harrow and soil preparation machine which were far more economical.
The time sequence was: circular self-cleaning harrow, soil preparation machine and, last, the disk harrow. The data were processed according to the Tukey test (p [less than or equal to] 0,05).
In order to reach such one passage with the circular self-cleaning harrow, two passages with the soil preparation machine and three passages with the disk harrow were necessary.
It was anticipated that most time would be used for cultivation with disk harrow, almost one half less time is used for work with the soil preparation machine; the work is performed fastest with circular self-cleaning harrow (p [less than or equal to] 0,05).
Usually, offset disk harrows have larger disks, up to 20 to 24 inches in diameter, set on a spacing of 9 inches.
The angles in both types of disk harrows can be adjusted to regulate the cutting depth and mixing action.
Rectangular balers, forage harvesters, grinder mixers, manure spreaders, mower conditioners, windrowers and swathers, field cultivators, chisel plows and disk harrows
show negative sales for 2000 ranging from 0.8 percent to 6.3 percent.