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Southern IA | top dressing works great when the rain works favorably, flush the fertilizer in the ground down to the roots and the plants don't get burned too bad and recover nicely. Topdress with urea and not get rain for a couple weeks and corn starts looking pretty rough and N starts volatizing. Sidedress it and put it under the ground, you still need a rain to flush it out to the plants and get good uptake, but you aren't losing it with it underground. Topdress is fast and easy with a lot more weather risk, sidedress is a lot slower and more expensive equipment, but a lot less risk to the plants and losing product. | |
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side dressing vs top dressing
