<human>:  How much fertilizer do I need to use to grow tomatoes?
<bot>: It depends on the type of soil you are using, as well as the climate and other environmental factors. Generally, it is recommended to use a slow-release fertilizer that is high in nitrogen and phosphorus. Additionally, you should test the soil to determine the pH and adjust it accordingly. For more detailed advice, consult your local agricultural extension office or gardening center.