Leaf discolouration in final flowering weeks

Does anyone know what kind of problem this is? These are my sour diesels and they’re entering their 8th flowing week

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Hey @Aisha1992
Looks like potassium deficiency to me.

Potassium Deficiency

Potassium Deficiencies in Marijuana Plants

Marijuana with Potassium Deficiency

Potassium deficiencies are fairly common in the world of cannabis cultivation. This is because, with most fertilizers, potassium occurs in the lowest ratios. Compared to the other macronutrients, less potassium is required by the plant.

A potassium deficiency has unusual symptoms: the plant might actually grow taller more quickly and look healthy at first, but keep an eye on the lower foliage. If the plant doesn’t have enough potassium, the leaves can turn brown and begin to die.

You also might notice areas where growth slows or becomes irregular. Remember that potassium is very important to the transfer of water and other nutrientsthroughout the plant. This means that if you have a large deficiency, it can affect the health of the whole plant. To treat your potassium deficiencies, try adjusting the fertilizer mix you are using or add a water-soluble potassium additive.

Could be from lack of nutrient or lockout due to ph.
Do you have a current ph and TDS test results?
What is the profile of your grow? Medium/nutrients/temp/humidity/ph/TDS/water source??