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Development of a Nitrogen Application System for Nitrogen Deficiency in Corn
노현권 한국농업기계학회 2017 바이오시스템공학 Vol.42 No.2
Purpose: Precision agriculture includes determining the right amount of nitrogen for a specific location in the field. This work focused on developing and validating a model using variable rate nitrogen application based on the estimated SPAD value from the ground-based image sensor. Methods: A variable rate N application based on the decision making system was performed using a sensor-based variable rate nitrogen application system. To validate the nitrogen application decision making system based on the SPAD values, the developed N recommendation was compared with another conventional N recommendation. Results: Sensor-based variable rate nitrogen application was performed. The nitrogen deficiency level was measured using the image sensor system. Then, a variable rate application was run using the decision model and real-ti me control. Conclusions: These results would be useful for nitrogen management of corn in the field. The developed nitrogen application decision making system worked well, when considering the SPAD value estimation.
Separation Characteristic of Shatter Resistant Sesame After Threshing
노현권 한국농업기계학회 2014 바이오시스템공학 Vol.39 No.4
Purpose: This study set out to develop a machine for separating shatter-resistant sesame after threshing. Methods: Threegrades of sieve and different blower speeds were tested for a separation system that had been designed specifically forshatter-resistant sesame. Performance tests were run to evaluate the sieve and blower systems in terms of the sesameseparation and loss ratios. Results: Tests of the first separation stage using the sieve system revealed the optimum sieveperforation size to be 5 mm. Tests of the second separation stage using the blower system identified the optimum blowerspeed as being 220 rpm. The optimum separation and loss ratios, of 96.5% and 3.5%, respectively, were obtained at ablower speed of 220 rpm. Conclusions: These results will be useful for the design, construction, and operation of threshingharvesters. For shatter-resistant sesame, an optimum blower speed of 220 rpm was identified.
UV/blue light-induced fluorescence for assessing apple quality
노현권,Renfu Lu 한국농업기계학회 2010 바이오시스템공학 Vol.35 No.2
Chlorophyll fluorescence has been researched for assessing fruit post-harvest quality and condition. The objective of this preliminary research was to investigate the potential of fluorescence spectroscopy for measuring apple fruit quality. Ultraviolet (UV) and blue light was used as an excitation source for inducing fluorescence in apples. Fluorescence spectra were measured from 'Golden Delicious’ (GD) and 'Red Delicious’ (RD) apples using a visible/near-infrared spectrometer after one, three, and five minutes of continuous UV/blue light illumination. Standard destructive tests were performed to measure fruit firmness, skin and flesh color, soluble solids and acid content from the apples. Calibration models for each of the three illumination time periods were developed to predict fruit quality indexes. The results showed that fluorescence emission decreased steadily during the first three minutes of UV/blue light illumination and was stable within five minutes. The differences were minimal in the model prediction results based on fluorescence data at one, three or five minutes of illumination. Overall, better predictions were obtained for apple skin chroma and hue and flesh hue with values for the correlation coefficient of validation between 0.80 and 0.90 for both GD and RD. Relatively poor predictions were obtained for fruit firmness, soluble solids content, titrational acid, and flesh chroma. This research has demonstrated that fluorescence spectroscopy is potentially useful for assessing selected quality attributes of apple fruit and further research is needed to improve fluorescence measurements so that better predictions of fruit quality can be achieved.