Hello fellow weed fans. I would very much appreciate some advice from more experienced growers in rectifying my problem of leaf tip browning. I am growing two indica-dominant plants in coco coir using Terra Aquatica Tri-Part nutrients (as I understand, the European equivalent of General Hydorponics Flora Series). My light source is a Mars-Hydro Pro II Epistar 320 LED.
Up until the switch to 12/12 neither plant had a single blemish. The switch to the flower phase meant a modification to the nutrient quantities and I suspect this is where the problem arose. TA does not provide much more than basic info on either their labels or on their site but, forwarned by advice given in GWE tutorials, I have been halving the amount of nutrients recommended from day 1 right through veg. and up to the present fifth week of flower.
My pH is always within range, both going in and draining out. I am putting enough nutrient water into the pots to allow a significant run-off for flushing out any build up of salts. I water every second day.
I have been measuring ppm in and out, but the science confuses me so am not sure how to respond to the results. But, with last watering, the ppm going in (both plants give roughly similar results) was 630 and the run-off, 582. TA recommends an EC - given in millisiemens - for the entire flower phase of 900 to 1000 ppm (I took the ppm equivalents from another site). My measurements, being lower, would suggest that nutrient burn is not the problem (?). I mix the nutrients into tap water that measures around 243 ppm.
The leaf tip browning affects both the leaves at the top of the canopy as well as the under-story where they are shaded somewhat from light -- so I do not think light burn is a possible cause. The LED generates a fair bit of heat but I am using a portable air conditioner to keep the temp. to around 22 degrees Celcius. The lamp is positioned at its maximum height for 'flower' as recommended by the manufacturer (18 inches).
The browning seems to be confined to the tips of leaves while the edges and middle of leaves are, so far, unaffected.
Should I perhaps increase nutrient quantities, I wonder? If anyone is familiar with the TA Tri-Part Series, I am currently using 0.8mls per litre Micro; 0.4mls per litre Grow and 1.2ml per litre Bloom which is one half the recommended dosage.
I would be hugely thankful to anyone who can identify exactly what is happening here. Please see my pics.
Thank you to all who respond.
Up until the switch to 12/12 neither plant had a single blemish. The switch to the flower phase meant a modification to the nutrient quantities and I suspect this is where the problem arose. TA does not provide much more than basic info on either their labels or on their site but, forwarned by advice given in GWE tutorials, I have been halving the amount of nutrients recommended from day 1 right through veg. and up to the present fifth week of flower.
My pH is always within range, both going in and draining out. I am putting enough nutrient water into the pots to allow a significant run-off for flushing out any build up of salts. I water every second day.
I have been measuring ppm in and out, but the science confuses me so am not sure how to respond to the results. But, with last watering, the ppm going in (both plants give roughly similar results) was 630 and the run-off, 582. TA recommends an EC - given in millisiemens - for the entire flower phase of 900 to 1000 ppm (I took the ppm equivalents from another site). My measurements, being lower, would suggest that nutrient burn is not the problem (?). I mix the nutrients into tap water that measures around 243 ppm.
The leaf tip browning affects both the leaves at the top of the canopy as well as the under-story where they are shaded somewhat from light -- so I do not think light burn is a possible cause. The LED generates a fair bit of heat but I am using a portable air conditioner to keep the temp. to around 22 degrees Celcius. The lamp is positioned at its maximum height for 'flower' as recommended by the manufacturer (18 inches).
The browning seems to be confined to the tips of leaves while the edges and middle of leaves are, so far, unaffected.
Should I perhaps increase nutrient quantities, I wonder? If anyone is familiar with the TA Tri-Part Series, I am currently using 0.8mls per litre Micro; 0.4mls per litre Grow and 1.2ml per litre Bloom which is one half the recommended dosage.
I would be hugely thankful to anyone who can identify exactly what is happening here. Please see my pics.
Thank you to all who respond.
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