The paper presents the analysis of systems for differentiated fertilization and the results of laboratory tests of subsurface fertilizer cultivator. The technology of the differentiated fertilizer application (DFA) is one of the priority areas in precision agriculture. The purpose of the research is to select the most effective DFA system for subsurface fertilizer cultivators applied in the northern regions of Kazakhstan and to test the design and technological scheme of pneumatic transport. The optimal system of differentiated application of fertilizers was chosen according to the generalized desirability function, the main difficulty was to create a sign that quantitatively determines the functioning of the object under study. To construct a multiple optimization parameter the idea of converting the natural values of specific object parameters into an unbounded scale was used. The obtained information on systems of differentiated fertilization was processed using standard methods of comparison, analysis, and synthesis. The results of laboratory tests were processed using methods of mathematical statistics. Based on the research results, according to the generalized desirability function the system «Agronavigator-Dozator» was chosen, which consists of a navigation system «Agronavigator Plus», GLONASS/GPS antenna, actuators, connecting cables and control panel for remote activation of the "Processing" mode. According to the laboratory tests, the functionality of the pneumatic transport system for mineral fertilizer granules and the dosing device was tested. The structural and technological scheme of pneumatic transport includes a fan driven by a hydraulic motor, airflow distributor, connecting pipelines and ejector funnels. It is established that in the range of fan revolutions from 2100 to 2700 rpm stable transportation of granules is provided without blockage of pipelines and ejector funnels, airflow speed in pipelines is provided in the range from 13 to 25 m/s. The deviation of the actual fertilizer dosage from the target was 2.1-5.0 %.
The paper proposes a method for determining specific soil resistance and presents the results of the conducted research. One of the main limiting factors in determining the working width of the tillage implement is specific soil resistance. This indicator is a quantitative characteristic of the labor intensity of soil tillage. Therefore, when designing new machinery, it is necessary to have reliable data on its value. The data presented in the scientific literature on the value of specific soil resistance are average and do not take into account the parameters of tillage working tools. Therefore, the determination of specific soil resistance for working tools with known parameters is the current topic of scientific research. The purpose of the research is to determine the value of specific soil re-sistance for working tools with known parameters. The research method consists of the experimental determination of the total draft resistance of the tillage implement and further mathematical processing of the obtained experimental data on the basis of the rational formula of Vasily P. Goryachkin. To conduct experimental research, a laboratory unit was developed. Its design elimi-nates the impact of its weight on the draft resistance, arising from the friction between the parts of the working tool and soil. It was found that for the soils under consideration, which are typical for Northern Kazakhstan, the specific soil resistance is k = 45908 N/m2. The obtained coefficient of variation υ < 10 % indicates a slight change in the considered variation. Therefore, the obtained value of the specific soil resistance is reliable. The obtained results will be used to substantiate the working width of the tillage implement with the working tools under consideration.
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