PPM can vary depending on which nutrients you use, here are some good
guidelines:
Tap water: 400ppm or below; 400 is high for tap water.
Nutrient Water: 500ppm - 800ppm total
DWC Reservoir water: 800ppm - 1500ppm
If my information isn't right,please let me know.
You may wish to include the information that the above is just a generalization. That nutrient requirements - and tolerances - vary by strain. Some strains evolved, or were bred, to do well when grown in soils that are not very nutritive. Those strains can burn at higher nutrient levels. Other strains are the plant equivalents to gluttons, lol.
I read some articles today that it's better not spray anything during flowering?
I read some articles from internet that they said it's better not spray anything,so i want to make sure :if i really need to spray something to my plants,which kind of things i should avoid?
Some strains are not very resistant to mold. This seems mainly to be certain indicas that have a very dense bud structure, but it is not necessarily limited to them (and some indicas that produce dense buds, conversely, appear to be somewhat mold-resistant). The breeders of some strains advise not to grow them outdoors in areas where rains are expected to be heavy late in the flowering period, for this reason.
The above might be part of the reason for what you have read. Another reason might be that some substances, when sprayed onto the buds, might... linger. For example, certain insecticides are generally considered to be harmless to people, but others are not. Of those in the latter category, some will decompose(?) after a period of time; this time might be as short as 24 hours, especially in the presence of strong light - but the length could potentially be longer. Then, too, some people like to foliar feed certain nutrients (et cetera), and a person might not wish to see such things still on the buds at harvest time, lol. It is important to remember that not everyone smokes their cannabis (many medicinal users suffer from lung aliments, and some people just do not like to smoke it). The buds might be made into food items or otherwise consumed.
It is not that "one should
never, ever, spray
anything on one's cannabis flowers (buds)," I think - it is more like a general rule. Something like... Well, we say here "better safe than sorry," lol. If you say that it is unwise to spray things on cannabis flowers, then you do not have to worry so much that someone will spray something that should not be sprayed. If that makes any sense? Think of it like this: A mother tells her young child not to cross the road. She does not do this because the act of crossing the road, in and of itself, is always inherently unsafe - she does so because there are certain circumstances in which it is not safe. Rather than to try to explain (and think of) every single different situation and discuss the relative safety (or lack thereof) in crossing the road under those conditions... the mother says, "Do not cross the road." Better safe than sorry
.
Neem-based insecticides are said to be safe to spray on our plants (even fruit and vegetable plants) up to the day of harvest. That means that we would not be poisoned if we consume the
fruits of those plants. Still... It might not taste particularly good, lol.
it's also depends on different light and grow style.
Really again it's completely up to the growers skill level, pot size,and strain. Some might get 10 grams per plant in 3L others I've seen get up to 20 grams with co2 added. I did an auto west coast og from fast buds in a 3.25l pot and got 17 grams dried. If I did 9 smaller autos or clones I could get a really nice sog happening which would utilize the light to the fullest but also be a pain to water or I can do one big one with a longer veg time in a scrog with a 18L pot but I like a variety of smoke.
I only can drink little red wine or beer,only a small glass...
At that time my answer is:I like it,it looks cool.Man should smoke.
Till now i still think that way,haha.
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