Calcium deficiency?

Raven121415

Raven121415

Well-Known Member
I am in middle of 5th week from flip and I noticed my leaves from the bud tops starting to turn light green, and some lower than those lightening from stem out to darker tips. I am assuming a calcium deficiency. I should also note I had to flush a few days ago due to a P tox from a bloom booster I used. I fed with 1/2 strength 20-20-20 the next day. I have Hi-Yield Calcium Nitrate. Its 15.5-0-0 with 19% calcium. Any advice on if and how to apply would be greatly appreciated.
 

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Raven121415 said:
I am in middle of 5th week from flip and I noticed my leaves from the bud tops starting to turn light green, and some lower than those lightening from stem out to darker tips. I am assuming a calcium deficiency. I should also note I had to flush a few days ago due to a P tox from a bloom booster I used. I fed with 1/2 strength 20-20-20 the next day. I have Hi-Yield Calcium Nitrate. Its 15.5-0-0 with 19% calcium. Any advice on if and how to apply would be greatly appreciated.
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Plants start to use up leaf energy towards the end of flower and start yellowing some times its best to leave alone so far into flower and not try add stuff to correct things. They need plenty of pk boost in flower maybe a shot of that or calmag tho
 
mr buddy said:
Plants start to use up leaf energy towards the end of flower and start yellowing some times its best to leave alone so far into flower and not try add stuff to correct things. They need plenty of pk boost in flower maybe a shot of that or calmag tho
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Yeah, it all started going downhill from added Bloom booster. It was 10-54-10 and I fed at 1/4 strength, then noticed purple stems and yellowing coming up branch leaves. I thought P tox, so I flushed with pure r/o water, then fed the next day. Now I am seeing lightening of the leaves from tops down now. I have 2 other ladies on same water/feed schedual not doing this however. Lol 1st grow indoors, and not directly in the ground. This has been a learning experience for sure though!
 
Raven121415 said:
Yeah, it all started going downhill from added Bloom booster. It was 10-54-10 and I fed at 1/4 strength, then noticed purple stems and yellowing coming up branch leaves. I thought P tox, so I flushed with pure r/o water, then fed the next day. Now I am seeing lightening of the leaves from tops down now. I have 2 other ladies on same water/feed schedual not doing this however. Lol 1st grow indoors, and not directly in the ground. This has been a learning experience for sure though!
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Were u bases I'm UK
 
I bought the same brand calcium nitrate today too. I just put a teaspoon in with a half hallon of water today. It dissolved nicely and shes still alive so i fuess i did it right.. i had the same question as you
 
JimmyTheNewb said:
I bought the same brand calcium nitrate today too. I just put a teaspoon in with a half hallon of water today. It dissolved nicely and shes still alive so i fuess i did it right.. i had the same question as you
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Are you still in veg? It seems a bit high in N to me for full strength. I use a 20-20-20 at 1/8 the recommended dose for feed. Lol Full strength 15.5 is a bit high I think for N. You won't see a toxicity right away either. It will show in a few days after applying in my very limited experience. Lol
 
Yes mine just started vegetation and tbh i dont really know how to mix ratios yet. This is my first grow ever of any kind. Ive done made so many mistakes to this poor girl its unreal. When i try and learn about it from old forums and people i get confused quick.
 
Looking at your pictures in post#1 very closely.. Absolutely 100% definitely I'm positive that you have Nitrogen toxicity, and possibly phosphorus toxicity simultaneously. Your yield will diminish if you continue like this. Also the plants will be weak and suseptible to disease. You need to give them clean fresh ph'd water many times in a row for the next few waterings and stop feeding them nutrients until you see the new top growth has normal not so super green curling down leaves. Normal top growth and leaves. Then you can feed nutrients again, but start at 1/4 what you'\ve been feeding, and don't feed everytime, not even second time. Plants dont need so much food. In soil it takes time for the plants to uptake what nutrients you feed. Things get compounded and trouble starts. Trust me.

Good Growing.
 
Last edited:
cannabisweedPotNerd said:
Another two weeks it should start to swell the buds
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I'm only mid way through
Johnei said:
Looking at your pictures in post#1 very closely.. Absolutely 100% definitely I'm positive that you have Nitrogen toxicity, and possibly phosphorus toxicity simultaneously. Your yield will diminish if you continue like this. Also the plants will be weak and suseptible to disease. You need to give them clean fresh ph'd water many times in a row for the next few waterings and stop feeding them nutrients until you see the new top growth has normal not so super green curling down leaves. Normal top growth and leaves. Then you can feed nutrients again, but start at 1/4 what you'\ve been feeding, and don't feed everytime, not even second time. Plants dont need so much food. In soil it takes time for the plants to uptake what nutrients you feed. Things get compounded and trouble starts. Trust me.

Good Growing.
Click to expand...
Yeah, I know I had the P tox for certain. I tried to flush, but maybe I didn't flush well enough. My feed says 1 tsp per gal, I use 1/8 tsp per gal, how do I get that down to 1/4 of that without wasting 3 gal? I mean, 2.5-2.5-2.5 shouldn't be to strong right? I did hit it with 1/4 tsp after flush this time though. Maybe that 5-5-5 was just enough to tip the bank? Lol Also, I don't have any way to ph my water. Never fussed with ph in outdoors, so i am just learning about that with this grow. I use pure r/o water for everything. My soil tests consistently @ 6.5-7 though. I have no ppm meter and never tested run off ph either though. Nor the feed water before going in. Guess I need to get with it a little more if I want to get serious with indoors. Thanks for your help also! I am sure I will be disappointed with my yield, as I am already seeing minimal change through week 5 as it is, and that's usually when things really started happening for me in the past. I suppose if I get a combined dry weight of 4 oz out of the 4 plants I won't be so butt hurt. Lol
 
Johnei said:
Looking at your pictures in post#1 very closely.. Absolutely 100% definitely I'm positive that you have Nitrogen toxicity, and possibly phosphorus toxicity simultaneously. Your yield will diminish if you continue like this. Also the plants will be weak and suseptible to disease. You need to give them clean fresh ph'd water many times in a row for the next few waterings and stop feeding them nutrients until you see the new top growth has normal not so super green curling down leaves. Normal top growth and leaves. Then you can feed nutrients again, but start at 1/4 what you'\ve been feeding, and don't feed everytime, not even second time. Plants dont need so much food. In soil it takes time for the plants to uptake what nutrients you feed. Things get compounded and trouble starts. Trust me.

Good Growing.
Click to expand...
Also, the newer top growth is coming in a very light yellow green. I assumed that was a cal def issue. Would fast acting gypsum be good at this point? Would it help with 3-4 weeks left in flower?
 
I beleive your plants are losing their green for an opposite usual reason like not enough Nitrogen or anything else like that. It is because there is a build up of nutrients in the soil, and you need to give them freswh water watering for them to have something to drink with their very salty meal. You cannot just flush soil and it's all out and balance is restored in one shot, soil HOLDS onto the nutrients and doesn't want to let them go easy. It takes time. So much salt a domino effect is beginning, micros at the top locked giving a light look, bottom leaves dark and others getting pale all wierd like, the plant was overdosed. I can see some crazy shit on the leaves and overall plant. It's not just, it needs this specific nutrient and all will be well. And your pH is probably all outta wack is part of the reason. Fresh clean ph'd water. give them a breather. lots of nutrients is not what grows big juicy buds. ;) a balanced diet is and proper pH for increased uptake. You've thrown the soil chemistry out of balance. Good luck.
 
I have a test for you. Next time you water, use just clean water no nutrients and look at the runoff water coming out of the pot,(make sure you don't just water down the side of the pot in the crack and it goes right through, I mean really get the water through the soil) and is this runoff water very yellow golden looks like nutrient water, or is it almost clear like the water you put in?
 
Johnei said:
I have a test for you. Next time you water, use just clean water no nutrients and look at the runoff water coming out of the pot,(make sure you don't just water down the side of the pot in the crack and it goes right through, I mean really get the water through the soil) and is this runoff water very yellow golden looks like nutrient water, or is it almost clear like the water you put in?
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I use a 1 qt Poweraid bottle with a tube in the lid and air hole. I watter slowly and a little at a time to ensure it soakes into the soil and doesn't run over the edges much. I get a dark brown run off no matter feed or water. I am due to watter in the morning. I will get a pic of the run off for you. I am just used to using rabbit poo and I have always grown outdoors and straight in the ground in the past. This is my 1st real potted grow with nutes.
 
Johnei said:
I beleive your plants are losing their green for an opposite usual reason like not enough Nitrogen or anything else like that. It is because there is a build up of nutrients in the soil, and you need to give them freswh water watering for them to have something to drink with their very salty meal. You cannot just flush soil and it's all out and balance is restored in one shot, soil HOLDS onto the nutrients and doesn't want to let them go easy. It takes time. So much salt a domino effect is beginning, micros at the top locked giving a light look, bottom leaves dark and others getting pale all wierd like, the plant was overdosed. I can see some crazy shit on the leaves and overall plant. It's not just, it needs this specific nutrient and all will be well. And your pH is probably all outta wack is part of the reason. Fresh clean ph'd water. give them a breather. lots of nutrients is not what grows big juicy buds. ;) a balanced diet is and proper pH for increased uptake. You've thrown the soil chemistry out of balance. Good luck.
Click to expand...
How do you ph water? Mind you, I live in an illegal state, and there isn't a hydro store or even grower friendly nursery or anything like that around.
 
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