Jiri Masek, Milan Kroulik, Zdenek Kviz, Vaclav Prosek Czech ...

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ENGINEERING FOR RURAL DEVELOPMENT Jelgava, 26.-27.05.2011. By monitoring these parameters the yield maps can be created. Spatially-related data of throughput of the material were recorded in the data logger. Pulses of a potentiometer and machine position from DGPS receiver were at the same time recording to the data logger, too. The recording interval was set to 2 s. 1 2 3 Fig. 1. Location potentiometer on the belt tensioning mechanism: 1 – belt tension roller mechanism; 2 – connecting rod; 3 – potentiometer Results and discussion The trial measurement was carried out in the selected field and started by pressing the arranged discontinuous row as it was explained above (Fig. 2). This step was taken as a calibration procedure. Based on the results of the calibration potentiometer the calibration curve was obtained. Depending on the number of pulses during the potentiometer and net weight of the package best fits the exponential curve with equation y=2745·1e -0.002x . The graph in Figure 3 shows the calibration curve. Number of pulses 3000 2500 2000 1500 0 20 40 60 80 100 Time progress, s Number of pulses 2900 2700 2500 2300 2100 1900 1700 1500 y = 2745.1e -0.002x R 2 = 0.9994 0 50 100 150 200 250 Weight of bale, kg Fig. 2. Course of data record during discontinuous straw row pressing Fig. 3. Calibration curve By pressing forage with a variable press chamber machine uniform compressibility of the bale with increased volume (diameter) of the bale is achieved. The increased volume of the bale recorded by the potentiometer is proportional to the increasing of the bale weight. Figure 4 shows the time series record of the measurement of the growth package. For the subsequent processing of each set the yield t·ha -1 gradually increases. Prior to the processing of the data set it was necessary to exclude values that were recorded during the tensioning mechanism for returning a package to the starting position and the value recorded on headlands. Also a point where the package is bound has to be excluded from the data set. After processing, the record has been found in straw yield values ranging from 1.5 to 7.3 t·ha -1 with an average of 4.4 t·ha -1 . 48
ENGINEERING FOR RURAL DEVELOPMENT Jelgava, 26.-27.05.2011. Pulses 2900 2700 2500 2300 2100 1900 1700 1500 0 50 100 150 200 250 300 350 400 450 500 Time progress, s Fig. 4. Adjusted measured values – number of pulses in time (during real harvest) The adjusted data were then used for processing by geostatistical methods which demonstrate the spatial relationships between the measured data. The final graphic output straw yield map was created by kriging interpolation method (Fig. 5 and Fig. 6). Straw yield (t·ha -1 ) 1.5-2.3 2.3-3.1 3.1-3.9 3.9-4.8 4.8-5.6 5.6-6.4 6.4-7.3 Fig. 5. Yield map of straw Fig. 6. Yield map of hay The course of the calibration curves shown in Figure 7 was proved according to our hypotheses that behaviour of the calibration curves would be dependent on the harvested material. Differences in 49 Hay yield (t·ha -1 ) 1.9-2.6 2.6-3.1 3.1-3.4 3.4-3.9 3.9-4.6 4.6-5.4 5.4-6.9
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Jiri Masek, Milan Kroulik, Zdenek Kviz, Vaclav Prosek Czech ...

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