Couple of yellow areas

Noticed today I have 2 strips in the brassica plot that are a bit yellow and stunted a bit. The rest of the plot is 10-18” tall and this is day 30 since planting.
Think I need more fertilizer in these couple of areas?
First pic is of the top of my rubber boot in the plot. I’m impressed for 30 days. Second is the yellow areas.

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Thanks for the input ,I have a bag and a half of fertilizer left so I will spread that on the next day I go up. We have had a lot of rain since planting as well. Calling for another 2.5-3” today and tonight so that could very well be the problem as well.

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