Fertilizer before or after rain?

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Would it be more beneficial to spread granulated fertilizer before or after a rain. My thoughts are it would get it into soil better. My dad thinks it will wash it away?
 
Need nutrients in the root zone ! Doesn't do a lot of good sitting on top. In sandy soils there is always a problem with nutrient flushing deeper with excessive rain, also steep slopes can result in fertilizer being washed off
 
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