For an average yard in the suburbs, one 5 gallon pail of liquid organic fertilizer can be enough to treat all the trees, shrubs, lawn and flower beds for an entire growing season.

At a mix ratio of 1 to 3 ounces per gallon, or, for estates, 1 gallon per 20 gallons of water, liquid fertilizer is a very cost effective program to get into, especially when you consider the cost of shipping many heavy bags of fertilizer over a long distance. One 5 gallon pail of liquid fertilizer weighs about 50 pounds in it's shipping box.

If you're a real lawn aficionado, you might consider the Turf Blend just for the lawn itself.

Application:

You'll want to buy a sprayer to apply the product to your lawn area, unless it's very small. If you have a small lawn, you can use a watering can. You can use a quality hose-on sprayer for moderately sized areas. Cheap hose on sprayers like a "miracle grow" sprayer aren't recommended. They are set up to use that manufacturers product, they're not that accurate and they won't last very long. Buy something you can have and use for a long time. There some sprayers available through our affiliates on the referring page to this one.

For garden plants and shrubs, including bulbs and perennials, a watering can will do the trick.

Here's some further insight:

Depending on the quality of the existing soil and turf, some people can use just the liquid fertilizer year after year to care for their plants. The microbial activity caused by the addition of fish and seaweed fertilizer helps the soil maintain a constant supply of nutrients and biological activity.

For people with loose, sandy soil, adding a top-dress of compost, worm castings or granulated fertilizer once and a while is a good idea. Soil with large amounts of humus retain water and nutrients longer and better than loose, sandy soils. For those with loose, sandy soils, an addition of humates to the mix is a good idea. Humate science is advancing every year and some promising experiments are being done right now growing all sorts of plants directly in sand using only liquid fertilizer and humates. You might want to experiment with them yourself.

For vegetable gardens, here's a little general advice:
Unless you know for certain that your soil is low in potash, avoid using the fish and kelp or kelp products on plants that who's stems we eat, like Broccoli and Cauliflower. The kelp makes for string stems and in the case of brassica that makes the stem kind of woody and tough to chew.
Use the straight fish fertilizer on plants stems you want to eat. It will leave the stem soft and tasty like the rest of the plant.
Use the Fish and Kelp fertilizer on plants like tomatoes that need strong stems. Corn likes the straight fish fertilizer but, if you have soil low in potash, often signaled by plants that lodge (fall over) before maturity, fish and kelp fertilizer might be called for.
Root crops like beets will do well with straight fish fertilizer.
Potatoes like and acid soil and lots of kelp. Some soils you can use only kelp on to grow potatoes. Too much fertility can cause disease and malformed tubers.