What is this? Give your suggestions

Grow Cycle
1

Can anyone tell what is this and why, i am using NPK 20-20-20 and ph in ra

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nge of 6 from today and before in between 7-7.4 , now watering in every 2 days around 2 litres , i think second photo of plsnt’s top could be bcoz of light bcoz light was placed around 16 inches from plant
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2

Don’t worry about the lower leaves. They yellow and fall off as the plant matures. The other picture shows a healthy plants.

It looks like you have a touch of nitrogen burn. Are you monitoring PPM?

3

It is around 1700