have nute problems in flowing stage plz help me identify the problem

Phosphorous. What are you feeding? If you're already feeding a flower nutrient, you might want to add some PK 13/14, or something similar with added P (like GH Koolbloom liquid).

az2000 said:

Phosphorous. What are you feeding? If you're already feeding a flower nutrient, you might want to add some PK 13/14, or something similar with added P (like GH Koolbloom liquid).

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az2000 is spot on by the looks of it.

If you are using products simmilar to what az2000 mentioned your PH may be the culprit as P has the smallest ph availability range. Once the PH in your medium drops under 5.5 is when you may start to see the signs of P deficiency that you are seeing now.