Time to topdress wheat? WORLD OF WHEAT Calibrate your winter wheat planter right, hit the target seed rate, apply fertilizer by the book, and stick to solid agronomy. No guesswork. Just yield Time to topdress wheat WORLD OF WHEAT Topdressing Wheat Crop Quest The 4 Rs of Topdressing Wheat AgWeb Giving the fertiliser spreader its final check over and run up, in preparation for top dressing OSR & Winter Wheat when conditions allow.