Sweet Mango under trouble

[lyrix]

Strain - sweet mango
# of Plants - 1
Grow Type - Soil
Grow Stage - Flower
Bucket Size - 2 gallons
Lights - (1) 400 Watt HPS
Nutrients - orgatrex, bio tabs: 1ml/litre
- backtrex, biotabs: 1g/litre
Germination: 19 September
Nutrient start:
PPM - 900
PH - 6.5
RH - 40% to 60%
Room Temperature 69 - 86
Room Square Footage - 80 cm x 80 cm (32'')
Light cycle: 18 - 6
Pests - None Known

Hello fancy weed people, we have been growing for 50 days now, among three ladies of other strains, a sweet mango auto fem. For the past three weeks, the leaves are steadily turning yellow from the inside (sometimes the outside) and the plant is losing leaves from the bottom up. We were told that this is a sign of nitro deficiency and tried to treat it with more nutrient (orgatrex) to no avail. Since the problem started, we have given 7 doses of orgatrex (5% Nitrogen 5% Potassium 1% Phosphorus | dose: 0.128 oz/gal) in the past 20 days, we water the plant every other two or three days. Please help!

 

[Nightmask]

Sometimes what looks like a deficiency may be a lockout from pH imbalance, so giving more of what you think it lacks may actually make the problem worse. For a large number of issues people recommend giving the plant a good flush and give a little feed with 1/4 strength nutes and then go back to your regular watering schedule.