Bonsai fertilization tips

Question: Bonsai fertilization advice

Hi! I'm Katia ... and I wanted advice on how to fertilize my bonsai if it's possible.
When I bought my bonsai (I have a Ligustro, an Elm and a Ficus ginseng) about 4 weeks ago, I also bought liquid fertilizer for bonsai with microelements. But I have never fertilized yet. Behind my bottle is written (N: P: K = 1).
Dosage: From 5 to 10 ml per liter of irrigation water; the treatment should be repeated every 15 days and then write that the cap of the package is equal to 20g and can be used as a measuring cup in 2 liters of water.
NITROGEN: 4.0% of which is urea
PHOSPHORIC ANHYDRIDE (water soluble): 7.0%
POTASSIUM OXIDES: (soluble in water): 7.0%
BORON (soluble in water): 0.05%
COPPER (soluble in water): 0.01%
MANGANESE (chelated with EDTA: 0.01%
ZINC (soluble in water): 0.01%
Since I read around that could create some problems for those who are inexperienced because it is not inorganic, to be prudent what do I do? For safety I dissolve 5 ml in a liter of water and water? Or will it be a little bit?
Thanks for the advice ... Thanking you in advance, I offer my best regards ...

Answer: Bonsai Fertilization Tips

Dear Katia,
fertilizers are important for all plants, especially if they are potted plants, and especially if they are bonsai, which have a tiny pot; in nature the plants of the forest do not receive man-made fertilizers, and therefore they find the mineral salts needed by them from the soil; but on the one hand the root system of a tree of the forest has the possibility of widening "at will", in search of the salts it needs; on the other hand, around the trunk of a tree, leaves, seeds, fruits, small dead animals and the excrements of the animals of the forest fall continuously: in this way the woodland recovers a lot of material from the environment, which decomposes , freeing up many substances in the soil that serve the trees, in a slow, continuous process. The soil conditions of a bonsai pot are very different from the natural ones: the bonsai roots absorb mineral salts that are fundamental for the development of the plant, until they are no longer found in the ground. And at this point we either change the whole soil, or add fertilizer. When we choose a fertilizer it is always good to choose the specific one for the plants we are growing, because each plant has different needs; if possible we choose the best one on the market, which contains Nitrogen, phosphorus and potassium, but also microelements such as boron, zinc or manganese, just like your fertilizer. In particular, the fertilizer you purchased is rich in phosphorus and potassium, a little less nitrogen; it is therefore more suitable for summer and autumn fertilizations, less for those at the end of winter, in which a fertilizer a little richer in nitrogen should be used. Since you are a beginner, I think it's early to buy so many different fertilizers, one for each season; rather learn to use what you already have, and learn a little about how the fertilizers are made, so that in the future you can choose the fertilizer that you think is right. As a general rule, when we do not know a fertilizer well, it is good to supply it in reduced doses: in this way we will guarantee a certain amount of mineral salts to the soil of our bonsai, but without risking excesses, which can burn the roots. The explanations on the bottle of your fertilizer are quite confusing, first they give you the dose in ml, then they tell you how many grams the measuring cup contains; however, consider that if it were water, one gram and one milliliter occupy the same volume; therefore more or less 10 ml of fertilizer fill half a measuring cup of 20 g. I advise you to supply small doses to start with, so half a measure for every two liters of water (in this way it relates to the wording on the bottle, which says 5-10 ml per liter of water, but remaining on the lowest dose); every 15 days more or less is fine.