Relation of the dynamic strength of fertilizers and their particle size distribution from the point of field application
2010
Macák, M., Slovak University of Agriculture, Nitra (Slovak Republic). Faculty of Engineering | Nozdrovický, L., Slovak University of Agriculture, Nitra (Slovak Republic). Faculty of Engineering
The quality of field application of solid fertilizers depends upon their physical and mechanical properties. Dynamic strength of fertilizers and their particle size distribution are considered as important properties affecting the quality of field application. With this motivation in mind, the authors conducted a study of the relationship between the dynamic strength of fertilizer particles, their size distribution, and acting air pressure during laboratory tests. These tests have been conducted according to the national standard STN 65 4827 - Method for determination of fertilizer dynamic strength. For the two selected granular fertilizer types a series of laboratory measurements of the mechanical damages of the fertilizer particles were conducted under conditions of variable air pressure. Before the experiments each fertilizer sample was sieved to obtain specific fractions. After the experiments, the results were subjected to analysis of variance, ANOVA. According to obtained results it is possible to determine the estimated level of fertilizer particle damage due to impact of dynamic forces in the application mechanism of the fertilizer spreader.
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