In this paper, we analyze a wide range of measurements of the day surface profile of tilled soil in order to substantiate the moving average method for evaluating morphological parameters and studying the influence of the base profile length on the accuracy of the obtained values. The surface roughness of the elementary plot was 4 mm, the surface ridgeness formed by technological furrows was 16 mm, and the slope of the plot was 0.198. The accuracy of the obtained values of roughness and ridgeness of the tilled soil surface depends significantly on the profile length determined by the number of measurements performed. We obtained 5273 data points per one turn of the device on a 6.3 m profile length (1 measurements are made per 1 mm) for the elementary plot. The surface roughness varied from 3, 1 mm to 4, 3 mm, and the ridgeness – 12 ... 21 mm when the number of measurements is from 2000 to 5273. When the measured profile length is about 1.3 m or less (not more 2000 points), the parameters of the tilled soil cover are not considered important. However, they are more critical for ploughed soil than for harrowed soil. On flatter surfaces, the base profile length of 2.5 m may be sufficient to adequately calculate the parameters of the day soil surface.

The work is devoted to study of profilograph features for determining geometric characteristics of products by laser scanning. The control methods applied are implemented in science-based designs of technical means of control that can provide high accuracy of parameter measurement when profiling the surface of parts. The analysis of graphs of the metal sheet surface in full and Cartesian coordinates made it possible to determine the highest and lowest points of the surface, therefore to determine the profile of sheet undulation. For example, the height of metal sheet irregularities resulted from some deformations was 6,378 mm.

The aim of the research is to determine the agro-technical characteristics of the day surface of tilled soil on sloping agricultural landscapes by applying the method of accurate ground scanning along the circumference. The specific difficulties that arise in developing and implementation of agro-technical measures are often associated with significant change of the main parameters of the day surface of tilled soil depending on space and time. Agro-technical parameters according to the agro-technical requirements for the main and pre-sowing tillage, the direction and value of the average slope of the soil surface, as well as the lumpiness and cloddiness of the tilled day soil surface are determined while controlling. According to the results obtained using the developed software, it was found that the deviation angle of the projection of the line of the maximum change in height from the direction of the tillage machine movement is α=-32.4 and the slope of the studied site is 4.8 degrees. The aggregates of 1-4 centimeters in diameter are prevailing in quantity that is crumbling is ensured. The weighted average diameter of the lumps was 4.07 cm, and the standard deviation was 5.05 cm.

The article analyzes an extensive set of measurements of the daily surface profile of cultivated soil in order to justify the moving average method for evaluating morphological parameters and studying the influence of the base length of the profile on the accuracy of the obtained values. The surface roughness for the elementary platform was 5.08 mm, the surface ridge formed by technological furrows was 21.9 mm, and the slope of the platform was 0.056 or 3.2 degrees. The accuracy of the obtained values of roughness and ridges of the surface of the treated soil depends significantly on the length of the profile under study, determined by the number of measurements performed. For one turn of the device for the elementary platform, 9616 data points were obtained on the profile length of 6.3 m (3 measurements are performed per 2 mm). The surface roughness varied from 2 mm to 6 mm, and the ridge – 16 ... 28 mm with the number of measurements from 2000 to 9600. When the measured profile length is about 1.3 m or less (no more than 2000 points), the parameters of the treated soil cover are greatly underestimated, and this error is greater for ploughed soil than for cored soil. On flatter surfaces, the base profile length of 2.5 m may be sufficient to adequately calculate the parameters of the daily soil surface.

The authors analyze an extensive set of data for measuring the daily surface profi le of the cultivated soil to assess its agrotechnical parameters. The research was carried out on a small agricultural catchment area of the Orininsky rural settlement, which is located in the Morgaushy district of the Chuvash Republic. Three agricultural fi elds were selected, ranging from 25 ha to 53 ha. The studied areas were cultivated in various ways: plowing with harrowing, disking the soil and winter plowing. The profi les of the studied elementary sections were measured using a developed ground-based circular laser profi lometer. Data on the state of the profi le were used to determine the main agrotechnical parameters - clumping, cloddiness, surface slope, and deviation of the travel trajectory of a machine and tractor unit from the line of equal height. A software tool for processing and analyzing data received from sensors has been developed. The results established that the deviation of the projection of the greatest elevation line changes (measured by the slope) from the travel trajectory of a unit with an angle of 62, a slope of 6.5, and in a quantitative size distribution soil aggregates of 1…4 inches in diameter prevail. The weighted average diameter of the clods was 3.99 cm. The research results have determined the use of recommend methods for stating the agrotechnical parameters of the daylight surface to evaluate the cultivated soil in accordance with agrotechnical requirements.