Testing the nutrient content of your soil helps determine the best fertilizer for your vegetables. Water, sunlight and fertile soil are essential ingredients for a successful vegetable garden.Healthy soil, in particular, is vital to the development of young plants because it allows for good irrigation and provides nutrients that are critical during early growing stages of vegetables.rganic Versus Inorganic Fertilizer. Vegetable plants will respond the same to fertilizers regardless of whether they are organic or chemically manufactured. However, both types of fertilizers have their own advantages, which can help determine which, or a mix of the two, is best for your vegetable garden needs.