MATHEMATICAL MODEL TO DESCRIBE OF SOME AMMONIUM NITRATE PHYSICAL PROPERTIES IN RELATION TO THE UNIFORMITY OF GRANULATED FERTILIZER APPLICATIONS
Abstract
This study analyzed the physical properties of a sample of ammonium nitrate: granules diameter (D), granules number (GN) by size classes according to their diameter, the total weight of the granules (TWG) on each size class, and respectively, the average weight of a granule (AWG) on each size class. The correlation analysis revealed very high positive correlation between AWG and D (r = 0.961) and high positive correlation between TGW and GN (r = 0.830). Negative correlations were recorded between GN and D (r = -0.744), AWG and GN (r = -0.796), AWG and TWG (r = -0.574), and respectively between TGW and D (r = -0.418). The distributions of the granules by size classes, and respectively the average weight of a granule according to diameter, were most accurately described by a smoothing spline model, under statistical safety conditions (confirmed by ɛi).
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