Well I have not used bat guano myself (for hydro), but because it has been a while for this thread, I figure I will through in my 5 cents.

As for the question of it being to strong, I wonder if that's the right question. Raw Bat Guano is like raw fish poop, or raw cow manure. In order for it to be useful for the plants, it needs to be broken down by beneficial bacteria in the first place. So to strong, or not to strong, it's useless to the plants until broken down. To me the question is how is it broken down into something the plants can use (that would make a difference)?

Hi happy_go_lucky,

Actually bat guano is out of place in an ordinary (chemically based and ready to absorb) nutrient solution for a number of reasons.

Generally speaking, it is indeed stronger (concentrated in NPK, notably N content) as any other manure. That is why it is recommended to be used only sparingly, to not burn any plants. It also differs from other manures because it has fermented over time and is already partially broken down by bacterial activity "on site". Thus it contains both, readily available nutrients and organic substances that need to be broken down further through either aerobic and/or anaerobic bacterial breakdown. Most hydroponic setups are not exactly suited for the purpose as there is no or little bacterial activity - and in many cases not a sufficient quantity of medium.

Depending on nutrient (reservoir) volume, one and a half cup is quite a quantity and may not be exactly welcomed by your pepper plants. Organic components are generally said to cause pH trouble, although this is a standard reply in forums, - I guess it really depends on. Monitor your pH and you'll see what it does. With younger pants, tip burn could likely be a short term consequence - well, you'll see soon enough if your plants tolerate it or if you did a mistake there... a bit late to ask now, isn't it? Better leave it out next time;-)

Btw: I have used bat guano in small quantities and as a complement for organic compost teas (mechanically stirred up and aerated in a compost brewer for some time) before using it as a "organic nutrient component". I believe this is the most appropriate and effective use for bat guano (and other guanos) for any alternative (organic as they say) hydroponic application. One more (but less obvious) exception would be drip to (little to no) waste, with a medium like coco husk, rice hulls or wood chips (mix) that allows further break down.

PS: bat guano comes in various NPK compositions depending on origin. Although it mostly has a rather high Nitrogen (and P) content, there is also bat guano with higher Potassium content. It's always very rich in micro elements and can indeed make a difference when there is a lack of the later. Especially for peppers, under adequate condition and ONLY as described or in any organic nutrient based hydroponic setup, I would recommend special Bat Guano with higher potassium content.

Hope this helps,
Lucas

Thanks for all the helpful info all:). I forgot to mention that I added some of the bat guano to my outdoor potted dwarf blueberry plant and it exploded in new growth,but showing signs of deficient or something (sorry I'm new) it sprouted new growth like crazy but the new growth has redish brown spots all over it and as winter is setting in, I assume that new growth is not nessary at this time of year.I'm planning on flushing the plant with plain ph balanced tap water,then mixing a nute with lower N and higher p and k. Is this the right move? My tap water comes out at around 7 and ppm has always been low (under 300). I know this is the hydro forum but I feed all my plants with hydro nutes so I figured this would be the appropriate forum:) thanks all

Fungal disease caused by the leaves dying as it is going into its dormancy period?

Hi bbrush. I'm confused by your answer/question..can you elaborate please? Sorry I'm new lol