Northern Lights leaf issues, need help

All,
Northern Lights Auto
Planted Jan 13 in 2x2 indoor grow tent, expected to finish around April 6th
Nutes - Advanced Nutrients and Big Bud (see pic)
Watering approx half litre per day, moisture meter showing that roots are moist
Don't recall the medium on this planting but it's a potting mix of some sort, not MG
Mars Hydro 1kw LED, 18/6 light schedule, light approx 18" above plant
Environment - Humidity stays around 50% & temp runs around 72
Trichomes are milky now and pistils are turning amber
Fan leaves have been trimmed to focus on cola growth

Issues:
Plant seems to be smaller than I would expect, only 15" tall but flowers are full and were healthy until the past week.
Sugar leaves are yellowing and getting very brittle

Any advice and help on this would be much appreciated since we're going to be finishing this plant soon.

they are currently maturing. There may also be some nutrient burn. maybe you should ease off nutrients for the last week or two. I planted Northern lights photos with this mars hydro light and i was disappointed too i then switched to a 400w hps. I too had the impression that they were maturing early with brown pistils appearing mid flower. they look like there is still 2-3 weeks left though

steve870 said:

they are currently maturing. There may also be some nutrient burn. maybe you should ease off nutrients for the last week or two. I planted Northern lights photos with this mars hydro light and i was disappointed too i then switched to a 400w hps. I too had the impression that they were maturing early with brown pistils appearing mid flower. they look like there is still 2-3 weeks left though

Click to expand...

I don't really want to increase the electric bill by changing from the LED and it has also worked good in the past, just seems as though the NL doesn't like my nutes or light. I have a Big Top plant next to the NL and it's doing good although it's a bit small also. I'll begin a flush cycle with the NL since it's winding down anyway.