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How to manage soil and nutrients when growing vegetables is discussed here, as is soil testing, soil pH, organic matter, and the use of commercial fertilizers.
Using fertilizers as nutrient sources in growing vegetables is one cultural practice that can improve production if done correctly. This means using the right fertilizer material, applying it at the correct rate and time, and using the proper method of application.
Fertilizer needs for vegetables depend on the kind of vegetable grown, chemical properties of the soil, previous cropping history, and adequate water for plant growth. Guidelines here are based on soil chemical properties and the kinds of vegetables grown. It is assumed adequate moisture is available either from rainfall or irrigation.
Problems with insects, diseases, herbicide injury, and weather conditions may be difficult to distinguish from soil fertility problems, and can occur at the same time.