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Evaluation of Modified Variable Rate Granular Fertilizer Spreader for Spot-Specific Fertilization in Wild Blueberry Fields
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 131618578, 2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131618578) @2013
Authors: Hassan S Chattha, Qamar U Zaman, Arnold W Schumann, Gordon R Brewster, Young K Chang, Scott Read
Keywords: Bare spots controller rat catchers fertilizer spreader and wild blueberry.
This study was designed to evaluate the modified VRG (MVRG) fertilizer spreader for spot application of fertilizer only in plant areas. A preliminary test using clay filler as the applied material was conducted at the selected field and 7.3 m wide and 60 m long track was made in the field. Twelve artificial bare spots were made in the selected track using orange colored tarps. Equal numbers of weighed rat catchers (i.e. 12) were placed on artificial bare spots and grass. The MVRG fertilizer spreader was operated on variable rate (VR) mode (detection and no application of clay filler on bare spots). The rat catchers were collected and re-weighed. The same procedure was repeated for uniform (UN) application mode of the system. The results of paired t-test showed significant difference (p-value < 0.0001) in VR and UN application in terms of clay filler application on bare spots. The results also showed that VR and UN treatments were not significantly different (p-value = 0.58) in terms of clay filler application on green grass areas. Therefore, the MVRG fertilizer spreader could be used to save fertilizer and protect environment.