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FERTILIZERS

Available dry fertilizers include (clockwise from top left): granules (synthetic), fish meal (organic), and controlled-release granules (synthetic). 
Fertilizer sections at nurseries, garden centers, and supply stores dazzle the gardener. The shelves are piled with boxes and bottles, the floors covered with bags stacked high. Labels identify the package contents as "rose food" or "vegetable food," "lawn fertilizer" or "general-purpose fertilizer." In some stores, you'll find bins filled with bone meal, blood meal, or hoof-and-horn meal--all labeled "natural fertilizer." Choosing the right products to keep your plants healthy can often be a bit confusing.
Understanding N-P-K
Regardless of its type, any fertilizer you buy will come with information about the nutrients it contains. Prominently featured will be the N-P-K ratio, the percentage the product contains by volume of nitrogen (chemical symbol N), phosphorus (P), and potassium (K). A 16-16-16 fertilizer, for example, contains 16% nitrogen, 16% phosphorus, and 16% potassium. A 25-4-2 formulation contains 25% nitrogen, 4% phosphorus, and 2% potassium. All fertilizers contain at least one of these components; if any is missing, the ratio will show a zero for that nutrient (a 12-0-0 fertilizer contains nitrogen but no phosphorus or potassium, for instance). Boxed, bagged, and bottled products display the N-P-K ratio on the label. For fertilizers sold in bulk from self-serve bins, the ratio is noted on the bin; for future reference, be sure to write the information on the bags you fill and bring home.

SYNTHETIC AND ORGANIC FERTILIZERS

Some fertilizers are manufactured in the laboratory, while others are derived from natural sources. Each has certain advantages.
Synthetic fertilizers
These products are derived from the chemical sources listed on the product label. They're faster acting than organic kinds and provide nutrients to plants quickly, making them a good choice for aiding plants in severe distress from nutrient deficiencies. Synthetic fertilizers are sold both as dry granules to be applied to the soil and as dry or liquid concentrates to be diluted in water before application. In dry form, they're usually less expensive than their organic counterparts. In some of the dry granular types (those known as controlled-release fertilizers), the fertilizer granules are coated with a permeable substance; with each watering, a bit of fertilizer diffuses through the coating and into the soil. Depending on the particular product, the nutrient release may last anywhere from 3 to 8 months.
Some synthetic products are packaged for special purposes; you'll find spikes and tabs for container plants, for example.
Note that synthetic fertilizers usually do not contain any of the secondary or micronutrients--but in most cases, these nutrients are already present in the soil. If a test indicates that some are missing, look for a fertilizer that provides them.
Increasingly popular as a fertilizer, seaweed is also an excellent mulch. Here, it blankets the soil of a potato patch. Nutrients gradually move from seaweed to soil during irrigation; after harvest, any remaining mulch can be worked into the bed. 
Organic fertilizers
Organic fertilizers are derived from the remains of living organisms; blood meal, bone meal, cottonseed meal, and fish emulsion are just a few of the many available types. Organic fertilizers release their nutrients slowly: rather than dissolving in water, they're broken down by bacteria in the soil, providing nutrients as they decompose. Because these fertilizers act slowly, it's almost impossible to kill lawns or plants by applying too much (overdosing with synthetics, in contrast, can have potentially fatal results). Some manufacturers combine a variety of organic products in one package, then offer them for general-purpose or specialized use.
Two commonly used soil amendments--compost and manure--have some nutritive value and can be used as part of an organic fertilizing program. The N-P-K ratio of compost varies from 1.5-.5-1 to 3.5-1-2. Chicken manure's N-P-K ratio ranges from 3-2.5-1.5 to 6-4-3; that of steer manure is usually a little less than 1-1-1.
Fertilizers containing seaweed are gaining favor with many gardeners. Besides providing nutrients in a form immediately available to plants, seaweed contains mannitol, a compound that enhances absorption of nutrients already in the soil, and various hormones that stimulate plant growth. And the carbohydrates in seaweed break down rapidly, nourishing soil-dwelling bacteria that fix nitrogen and make it available to plant roots.
Mixed with water and sprayed directly on foliage, seaweed-containing fertilizers can have dramatic effects in a matter of days. Plants green up and begin to produce new growth, and those that are weak stemmed and straggly straighten up and become stronger.