What kind of deficiency? can anyone help please?

Hi

My plants are in 5 week flowering cycle, growing in plagron bat mix.all veg no nutrients added.ph checked regulary.Recently added some biobizz bio bloom plus bio heaven microelements cos leafs have dark patches and tips looked liked burnt I added some epsom salt few days ago but there is constant progress of yellowing .Im a bit concerned I dont want them to lost all leafs... its just a halfway of the flowering stage.What do u think? here is some photos. Ah, and my sensi star, looks just great comparing to others...the same conditions, no yellowing, maybe a little bit but just at very bottom.

I can obviously be wrong, but when my plants look like this I feed them with a little N. I use a bat guano with low N (3-10-1 if I recall), just enough to add a boost and finish out the flower cycle. Again, this is just my experience, some plants don't seem to like much N at all in flower, though I've not run into this.

5 weeks in your plants have probably ran out of nitrogen and its starting to suck it out of all the leaves. it usually starts from the bottom and works its way up. like the user above said some nitrogen can usually save most of the leaves that are not far too gone. if it was at 7 weeks or so so i wouldnt worry as much but only 5 weeks in you need to add some N.

thanks for ur replies, definitely ill give them some today... Ill give them some of the biobizz bio grow

They look hungry...so you haven't added nutes the whole grow?

I havent added any as the plagron bat is really strong My plants were beautiful during first six - 7 weeks. At 5th week I added a tiny bit as I was told that you have to start giving them as they enter the flowering cycle. I ended up burning the whole plant So I was waiting patiently , doing just water and suddenly they showed some signs of deficiency. I started adding very slowly bio bizz nutes... but it is worse and worse. I dont know if it is nute burn or photassium/nitrogen deficiency. More and more leafs turn yellow, even my Delahaze ... upper leafs getting light yellowish color with little little dark spots and curled, dried edges.Can somebody help please? Schould i flush them and then adjust the nutrients? I've added epsom salts , molasses, biobizz biogrow and bio bloom ... so far . it is 5th week of flowering cycle .I have to also say that conditions are perfect-right humidity, temp 24%, watering every 4 days, ph levels ok. what do u think?

Are you using an HPS for flowering?

That looks like radiant heat is causing the leaf chlorosis. Do you notice that the plants that are more directly under the light show the worst symptoms?

Are the shaded parts of the plants as affected?

Im using HPS. I have 3 strains. Delahaze, ice cream and sensi star.Sensi Star looks great and it is directly under the lamp.I know that is either some kind of nutrient lock-up or nutrient burn ... have no idea.at the same time it can be lack of nitrogen, pothassium and magnesium and calcium ... what is wrong?

shakti said:

Hi

My plants are in 5 week flowering cycle, growing in plagron bat mix.all veg no nutrients added.ph checked regulary.Recently added some biobizz bio bloom plus bio heaven microelements cos leafs have dark patches and tips looked liked burnt I added some epsom salt few days ago but there is constant progress of yellowing .Im a bit concerned I dont want them to lost all leafs... its just a halfway of the flowering stage.What do u think? here is some photos. Ah, and my sensi star, looks just great comparing to others...the same conditions, no yellowing, maybe a little bit but just at very bottom.
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Personally I would suggest giving some N, along with your bloom nutes, especially if you're only half through flower.
Make sure you have plenty of Ca, and MG too, even if you have to go to a nursery and get something extra like 'Maxi Cal' like I did, cheaper and faster than ordering Cal/Mag.
And QUIT pulling perfectly good leafs off just to take pics.

shakti said:

Im using HPS. I have 3 strains. Delahaze, ice cream and sensi star.Sensi Star looks great and it is directly under the lamp.I know that is either some kind of nutrient lock-up or nutrient burn ... have no idea.at the same time it can be lack of nitrogen, pothassium and magnesium and calcium ... what is wrong?

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Forget the nutrients.

The heat from the light is the problem.

But go ahead and throw fertilizer at her. Flush her, adjust the pH, add some cal-mag, spray with epsom salts....

Then, if she is still alive, deal with the heat intensity.

MYOB said:

Forget the nutrients.

The heat from the light is the problem.

But go ahead and throw fertilizer at her. Flush her, adjust the pH, add some cal-mag, spray with epsom salts....

Then, if she is still alive, deal with the heat intensity.

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Where are the curled up leaf edges?? I'm just trying to reason how you came up with heat stress. The end result of the picked leaves maybe, but his other pics don't seem to show heat stress.

The first leaf showed sings of a Potassium shortage. The rest of the plant seems to be suffering from a lack of nitrogen. Remember, just because you are flowering a plant doesn't mean to neglect the N. Respect the N. Green leaves promote much more photosynthesis which promote more nutrients to where you want them.

could be manganese.

Thank you for all replies.Indeed that could be anything One thing i noticed today is that a yelowish-dark little spots apear in the middle of the leaf , and that they affect even top leafs. Few days ago I gave them everything and it is worse.The only thing that comes to my head now is to flush them and give them nutriens again.It cant be heat as it is my 4th grow already , the same conditions. It is definietly some kind of nutriens lock up.... Also I 've read somewhere that givining them nitrogen in flowering its not good. they are entering 6th week of flowering

shakti said:

Thank you for all replies.Indeed that could be anything One thing i noticed today is that a yelowish-dark little spots apear in the middle of the leaf , and that they affect even top leafs. Few days ago I gave them everything and it is worse.The only thing that comes to my head now is to flush them and give them nutriens again.It cant be heat as it is my 4th grow already , the same conditions. It is definietly some kind of nutriens lock up.... Also I 've read somewhere that givining them nitrogen in flowering its not good. they are entering 6th week of flowering

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It is my understanding that nitrogen is not a good idea later in flowering for heavy sativa dominant strains, but I've given low levels of N in flowering up to 5-6 weeks with great success on almost all of my plants. I'm no pro by far, but this has been done on at least 8 plants with no negatives that I could see.

The big leaf is form the bottom of the plant, and the small one, from the top i gave them everything already.maybe give them more. I gave them about 1,5ml per liter twice a week

brotherjericho said:

It is my understanding that nitrogen is not a good idea later in flowering for heavy sativa dominant strains, but I've given low levels of N in flowering up to 5-6 weeks with great success on almost all of my plants. I'm no pro by far, but this has been done on at least 8 plants with no negatives that I could see.

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Good point, but high doses, especially constant of N later into flower can/ will slow bud growth in any strain, not just Sativas.
I usually give veg nutes up through the third week of flower, or until I notice the stretch has stopped (Whichever comes first), then go to the bloom nutes, substituting with veg nutes once a month or so when I notice some yellowing/