Abstract
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.
Highlights
The soil surface roughness of the agricultural landscape plays an important role in a number of agrochemical as well as physical and mechanical processes occurring at the "soilatmosphere" system interface [1, 2]
Infiltration, watercourse formation and soil erosion are among the phenomena that are typical for the agricultural landscape of slope lands
Based on the results obtained in this study, several conclusions can be drawn: 1. Tillage operations significantly affect the value and variability of parameters of the day soil surface
Summary
The soil surface roughness of the agricultural landscape plays an important role in a number of agrochemical as well as physical and mechanical processes occurring at the "soilatmosphere" system interface [1, 2]. It is a characteristic vertical scale of the length of microrelief variation from individual soil grains to soil aggregates ranging from 1 to 10 mm. Roughness is quantified by a random value, which is essentially the standard deviation of surface elevation data from the average height value after the correction using the best fit plane and elimination of tillage effects in some height values, what is noted document [5] and GOST 25142-82 " surface Roughness.
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