You are directly in the earth correct??? No containers or grow bags looks to me. Did you do a soil test from the location you are using?, if directly in the earth. Without a upfront soil test you will at times find you may actually be overfeeding the plants and signs and symptoms from overfeeding may show.
The reason I ask is depending on what part of the globe your growing in very rarely will you find your soils will be deficient in the minerals for a successful grow. With longer running strains you may find the need to amend or fertilize on your next seasons run as the soil will then be deficient from the season before.
You can get a soil test for a nominal fee and it will help you to understand what if any amending you need to do on the front end of your grow when planting. The cost of the ST will pay for itself just in savings you enjoy from not having to buy all the bags and bottles when you may not even need them.
I only say this as the most common mistake guys outdoors make is not knowing the nutrient/mineral levels in their native soils and start pounding the grow with fancy bottles and topdressing etc that aren't even required based on the soil profile from the test.
Be mindfull of how much guano you are using. It is potent and without a soil test you don't even know if your location is deficient in anything you need for a awesome grow...…………..
My next statement is based on the fact that your soil is in good shape from the test , then the only time you will need to amend is if you use the same spot for consecutive runs as cannabis is a hungry plant and after the 1st season your soil profile will need some help. Thats why farmers use crop rotations to change up the demands on the soil biology in their fields.
Again most of the time we as growers experience issues it is do to with overwatering and or overfeeding in an attempt to force the genetics to produce huge amounts when truly a great soil doesn't need all that much help.
Hope this helps. Do soil testing and understand your results and it will make you a better grower. Not saying you already aren't :D just saying that test is an awesome tool for your arsenal!!!!