In layman's terms, the numbers represent the percentages of the three primary ingredients - - Nitrogen - Phosphorus - Potassium that are in the fertilizer package.
So, if you bought 100 lbs of 12-3-4 fertilizer, that 100 lbs. would contain 12 pounds of nitrogen, 3 pounds of phosphorus and 4 pounds of potassium. The remaining 81 lbs. of the fertilizer would be inert materials.
The blend of fertilizer you need for your particular situation can only be determined by a soil test to see what nutrients already exist in your soil. Additionally, different kinds of plants (grass, corn, tomatoes, etc.) require different kinds and levels of nutrients to thrive.
So, to really do a good job, have a soil test done and specify what you want to grow on the soil. The test results will define what quantities and blends of fertilizer will help you the best.
Or, you could just buy some 17-17-17 and spread it, which is what most homeowners do.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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