Vu que le topic parle des additifs et engrais influençant L'EC ... bah pour pas cramer ses plantes, le guano, c'est l'engrais naturel ultra organique par excellence.
Les chauves souris se nourrissant rarement des végétaux issues de la production des hommes polluée ++,comme l'herbe (NPK monsanto) que mangent nos animaux par exemple ... difficile de trouver plus efficace et autant safe.
Même si ça reste insuffisant pour réaliser une culture "au top" ça devrait être une des bases de tous cannabiculteurs soucieux de la qualité du produit fini.
Pas mal de bons breeders misent avec ...L'UFCM aussi conseil "à tous!" de cultiver organiquement et light.
L'IACM aussi !
Associations, qui au passage, ne comprennent pas comment on peut s'auto produire et introduire des produits toxiques dans sa culture ...
Un petit truc intéressant sur le guano ...
We Have Fouled the Land.
Until the 1940s, farmers returned essential nutrients to the soil by mulching, manuring and crop rotation. These methods have worked successfully to maintain soil quality since agriculture began. But human greed and arrogance convinced commercial interests that they could use man made technology to do better than Nature, and make bigger profits. So began the degradation of the American food supply.
At the end of World War II, drug conglomerates making nitrates and phosphates for weapons, were left with few buyers for their stockpiles of chemicals. They had to find new markets for their products. Earlier experiments had shown that many plants will grow on a mixture of just three minerals, Nitrogen (N), Phosphorus (P), and Potassium (K). Armed with this knowledge, war chemical manufactures began selling NPK fertilizers to farmers at attractive prices that made traditional soil enrichment methods uneconomical.
By the '60s, in order to compete in the food market, almost all American farms had become totally dependent on NPK products in order to make a living.
Mixtures of NPK provide three of the main minerals essential for plant health. They grow fine looking crops with abundant yields.
But your body is not a vegetable!!
Human need more than nitrogen, phosporus and potassium, they also need selenium, chromium, calcium, magnesium, iron, copper, iodine, molybdenum, zinc, cobalt, boron, and vanadium.
NPK fertilizer, a destructive legacy of weapons of war, do not contain the minerals essential for human health, because they were never designed for human nutrition.
As each succeeding crop grown on NPK products has depleted the soil of other essential minerals, and these minerals are no longer replaced, most produce now grown in America has become mineral deficient. That makes you deficient also, because your body cannot make minerals and has to get them from your food.
It's certainly food for thought !!
So, that's the argument for organic growing.
Why should you use Guano?
Gardening with nature as example........it's all about gardening in an organic way. It contributes to a beautiful garden, since a natural garden guarantees that plants grow in a better way and have exuberant blooming effects. And come to think of it.....it's even cheaper, since healthy plants don't suffer from diseases, plagues and have less difficulties with dry and cold periods.
Every plant is more or less depending on the presence of bacterial and fungi (micro life), which are active around the plant's roots and therefore feed and protect the plant. It's possible to stimulate this micro life by adding a natural fertilizer such as Guano. Chemical fertilizers are deadly for the micro life around the plant's roots. Important fungi are very sensitive for chemical fertilizers and will end up disappearing in the micro life. For this reason diseases and plagues will get a chance to prevail. Only 100% natural fertilizers stimulate micro life in a maximum way. This leads to healthy and stronger plants that need less care. The result of this is a more beautiful and healthy garden, for which you have to spend less money for eliminating diseases and plagues.
Guano contains only 100% natural ingredients which may not be compared with other organic fertilizers such as cow and chicken dung. Cows and chicken are fed artificially. Even though cows and chicken receive natural ingredients, please keep in mind that most of the time these ingredients are not fully organic, since these ingredients are not processed in a natural way. I.e. Cows eat grass.....grass is fertilized with chemicals in order to let it grow. This proves the fact that Guano is ultra organic. The bats have to look for their own food (insects or fruits). This food is all present in the jungle where humans never had any influence.
The use of phosphatic materials as fertilizers was practiced unknowingly long before the isolation and discovery of phosphorus by the German alchemist Brand in 1669. As early 200 B.C., the Carthaginians recommended and employed bird droppings to increase the yields from their fields. The Incas of Peru prized guano and bird droppings on their islands ...
@PBZ ;
Les éléments nutritifs indispensables à la vie d'une plante se subdivise en deux catégories : les macronutriments et les micronutriments.
Les macronutriments sont caractérisés par leurs concentrations supérieur à 0.1% de la matière sèche. On y retrouve les principaux éléments nutritifs nécessaires à la nutrition des plantes, qui sont le carbone, l'hydrogène, l'oxygène et l'azote. Ces quatre éléments qui constituent la matière organique représentent plus de 90 % en moyenne de la matière sèche végétale, auxquels on ajoute les éléments utilisés comme engrais et amendements qui sont: le potassium, le calcium, le magnésium, le phosphore, ainsi que le soufre.
Source : Wikki
En fait, prends par exemple le N, si il est organique à la base (purin, fish, ...) il le reste un temps puis se minéralise dans le temps.Il doit être minéralisé pour être absorber ++ par la plante.
Mais même là, il reste d'origine organique contrairement à de L'azote de synthèse.
C'est ça que je souligne les potos
(c'est clair dans ma tete mais pas quand je me relis ^^)Quand à l'organo-mineral, c’est de la fumure pour agrobiologistes répondant au cahier des charges du règlement CE de l’agriculture biologique.
@+
).
et bon grow, la force verte!!! 
j'avais le sachet échantillon 
