Help bonsai

Question: help bonsai

Good morning!!!
About 5/6 months ago I found a leafless bonsai near a dumpster ... I tried to take it home and I realized that it was still alive. In recent months I have watered it regularly ... and it has bloomed ... many beautiful leaves have come out ... but now they are 2 months in which leaves do not grow anymore ... and some of them start to turn yellow ... I think it would also need a racking because I start to see the roots that come out of the ground above ... only that I don't know anything about bonsai ... I don't even know what species this is.
I really need a hand to understand how I can continue to keep it alive ... with fertilizing, repotting, pruning ... I would like to understand first of all what family is perhaps zelkova ... I know I am incompetent on the subject ... but I am fond of it and I would like to do something for save it.
Thanks so much!!!!!!!!!!!!

Answer: help bonsai

Gentile Martina,
unfortunately without a photograph it is not possible to recognize your bonsai, but I think you can do it: on the web there are thousands of bonsai photos, try to take a look if you see a plant that is at least similar; or bring your bonsai in a nursery (even just a twig with some leaves). It is essential to understand what species it is, in order to place the plant in the right place, with the correct lighting, and with the arrival of autumn it will be even more important, because if you bring an outdoor bonsai into your home, or if you leave it in garden an indoor bonsai, surely a series of irreparable problems will arrive. The fact that somebody before you had given up cultivating the plant, indicates that with good probability it is a plant quite difficult to cultivate, such as a sagerezia, which responds very badly to the climatic changes, but it is up to you to check of what species it is. Generally speaking, there are indications of cultivation that can be useful for most bonsai. For example, avoid keeping your little tree in full sun, rather look for a semi-shaded place, with a few hours of sunshine in the morning, and shade in the hottest hours of the day: the small vase of a bonsai can be completely dried up in a few hours of direct summer sunshine. The watering must be regular, because the roots are forced into a small vase, and therefore they cannot expand to look for water in a large earthen bread. The best method for watering a bonsai is by immersion: place the pot in a tray, and add water to the outside edge of the pot; when the water, by capillarity, succeeds in wetting the surface of the soil, you can remove the bonsai from the basin, and let it drain, before repositioning it in its place; in this way you can be sure that you have well watered all the earthen bread around the roots. For repotting, it uses akadama, mixed with a little universal soil, and after repotting, it always water and place in half shade. If the days are very hot and dry, remember to spray the hair with demineralized water. In any case, avoid leaving the bonsai in a soil constantly soaked with water.