comparing two types of fertilizer distributor (centrifuge) in order to ptimize the pattern of fertilizer distribution

increasing demand for food production in the recent years has raised the usage of granular fertilizers. consequently, the growing use of fertilizers has reduced the quality and quantity of crop production. in addition pollution problems such as soil and water (surface and subterranean water) contaminations has increased. consistent spreading of fertilizers in the farmlands is of fundamental rules in conventional framings. in present study, the effects of the number and the arrangement (position) of blades of a single disk fertilizer distributer and for two different fertilizers were investigated in order to obtain optimized distribution of fertilizer. the tests were conducted in factorial arrangement and in a completely randomized model. the variables were the number of blades in three levels of 4, 6 and 8, the blade position angles (in two patterns of radial and non-radial) and the type of fertilizer (phosphate and nitrate). statistical analysis of results indicated that the number of blades on the disk and type of fertilizer are not effective parameters in order to reach a consistent distribution pattern of fertilizer while the position of blades on the disk has significant influence for this purpose. the best pattern of distribution was obtained from the disk with four non-radial blades and nitrate fertilizer.