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Old July 17, 2017   #4
Cole_Robbie's Avatar
Join Date: Jun 2012
Location: Illinois, zone 6
Posts: 8,159

Standard practice near me is to alternate calcium nitrate and 4-18-38. Magnesium is typically the first micro deficiency to appear.

Depending on the amount of granular that you used, you may have put in plenty of NPK already. The nitrogen will be the first element of the NPK to be washed away by rain. I'd go light on the chem ferts and watch for leaf curl or other signs of over-fertilization.
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