Nitrogen

[GCase]

The following is from Ed Rosenthal - Grow Tips (online)


Nitrogen. N is the most common deficiency of cannabis indoors or out. The first sign is a gradual, uniform yellowing of the large, lower leaves. Once the leaf yellows, necrotic tips and areas form as the leaves dry to a gold or rust color. Symptoms that accompany N deficiency include red stems and petioles, smaller leaves, slow growth, and a smaller, sparse profile.
Remedy by fertilizing with any soluble N fertilizer or with a complete fertilizer that is high in N. If your diagnosis is correct, some recovery should be visible in three or four days. New growth will be much more vigorous and new stems and petioles will have normal green color. Indoors, you should expect plants to need N fertilization a few times during growth. Once a plant shows a N deficiency, you should fertilize regularly to maintain healthy and vigorous growth.


My question: Has anyone had to supplement soil with nitrogen during mid to final flowering. I know that it is diminished towards the end anyway. However, during mid-flowering if it is prudent--what source, kind of and method have you used. Bat..



I'm referring of course to the start of the yellow tips when mag/cal/ph and all else is aok.


Most of the fert. regimes begin to reduce N. as plant enters flowering growth stages.



This is open to discussion. I may be way off basis. If this is a terribly misleading and confusing thread, then, any moderator feel free to dump it. I don't want to confuse anyone in a so easily confusing area of cannabis' persnickety:no:.



CG

 

[Muddy]

This question is something a couple of us have been kicking around lately. Scott817 has been feeding more N through flowering and has seen an improvement in his plants. I just started a new grow a couple weeks ago and am planning on giving it a try myself with these plants. I'm using the GH Biothrive line, Grow, Bloom, and Marine, along with cal/mag and PK13.14. I normally switch over to bloom nutes around the end of week 6. What I'm thinking of trying this grow when I get to that point is feeding Grow, PK13.14 and cal/mag one feeding, then Bloom, Marine and cal/mag the next. I'll be starting a grow log soon and will keep it updated with my progress.

 

[GCase]

Thanks for the reply and start on this tread. I didn't know what pk13.14 is--so for those of us wondering here it is: CANNA PK 13/14 is a high grade mixture of phosphorus and potassium that is added during the flowering phase. Both elements play a big role during the flowering phase of fast growing plants. Thanks to a special production process CANNA has succeeded in combining pure phosphorous and potassium in very high concentrations and this makes PK 13/14 available to the plant quickly and directly. PK 13/14 is used with every medium and consequently it is used for cultivation on soil, in recirculatory systems, when cultivating on coco and in run-to-waste systems. PK 13/14 is suitable for use when cultivating both indoors and outdoors.

Sounds good with cal/mag.

What about a soluble nitrogen product. Possibly a very specific seabird or bat guano at a very small dose. Any one out there feed any mid to late flowering or willing to give it a test--that is if plant(s) need N. CG

 

[Muddy]

Atami makes the PK13.14, Canna makes the PK13/14. Confusing, heh?

I've used worm castings and still would had I not lost my bulk source. I mixed them into Pro Mix with additional perlite at a 4-1 ratio. So I'm back to growing in straight Pro Mix and am seeing the need for additional N in veg without the castings. Castings, guano or composted manure can be used as a top dressing at any point additional N is needed. Any of those can also be soaked in water to make a manure tea which can then be feed as nutrient.

 

[GCase]

Congrats Muddy - I heard your getting close to being officially old(er). Going to hopefully get some feedback over time with this. I looked at my cal-mag and now see that it has a shot of N in it, which, ought to give a plant a nice supplement, but not enough for a serious deficiency. Waiting for others to opine. Right, a tea makes good sense.

I came across this product--a good tea for N: Super Nitro Bat Guano| 15.5–1–1 Roots Organics Super Nitro Bat Guano is incredibly high in Nitrogen and is extracted only from select caves when the quality is at its highest. Potent and powerful high nitrogen guano consciously extracted to not disturb the bat colonies but provide an unparalleled completely natural source of nitrogen. Roots Organics Super Nitro Bat Guano is fast acting and is so powerful it should be used carefully and sparingly. All of the Roots Organics guanos have been carefully sourced for quality and harvested with bat friendly methods so you and your garden get performance with principles.

CG

 

[Muddy]

I left old behind a while ago. I'm well on my way to ancient!

That looks like a good high N source but as they say, go easy with it.