I buy fertilizer from the local grain elevator. You can get it in bulk or by the bag; generally cheaper in bulk.
The formulation of fertilizer, as has already been mentioned, is composed of three values: Nitrogen, Phosphorus, and Potash. Without a soil test, you have no idea of what values you should be applying for the last two. The good news is, soil tests are often free.
To make the numbers come out, sometimes you have to blend two or three different numbers to get the right mix to correct a Phosphorous or Potash problem. It is not hard to do--for instance, you can mix a bag of 46-0-0 with a bag of 8-32-16 to get 100 lbs of 27-16-8.
I guess you can go as far into this as your interest dictates but the general rule of thumb for cool season grass is that you put down approximately 1 lb of Nitrogen per 1000 sq ft at a time and how often per year depends on how well you like to water, mow and pay fertilizer bills. If you're going to fertilize once per year, September is the time to do it. If you're going to fertilize twice, add a treatment in November. Three times--do the third in late May using slow release Nitrogen.
At least, that is what Kansas State University has to say about it.
Horticulture Library
The formulation of fertilizer, as has already been mentioned, is composed of three values: Nitrogen, Phosphorus, and Potash. Without a soil test, you have no idea of what values you should be applying for the last two. The good news is, soil tests are often free.
To make the numbers come out, sometimes you have to blend two or three different numbers to get the right mix to correct a Phosphorous or Potash problem. It is not hard to do--for instance, you can mix a bag of 46-0-0 with a bag of 8-32-16 to get 100 lbs of 27-16-8.
I guess you can go as far into this as your interest dictates but the general rule of thumb for cool season grass is that you put down approximately 1 lb of Nitrogen per 1000 sq ft at a time and how often per year depends on how well you like to water, mow and pay fertilizer bills. If you're going to fertilize once per year, September is the time to do it. If you're going to fertilize twice, add a treatment in November. Three times--do the third in late May using slow release Nitrogen.
At least, that is what Kansas State University has to say about it.
Horticulture Library