Hey there guys- I used to blindly put down the fertilizer "four step" programs. But lately I have been trying to improve and take the guess work out of fertilizing. I went out and bout a CBRIII spreader since I thought it would be more accurate. I have also been getting soil tests for some of my nicer lawn accounts at my local seed store and they give me printouts like the ones below: However they are not very helpful there. So I was hoping you guys might be able to give me some insight. From this soil test shown above, they recommended i put down a 19-0-19 fertilizer. So i put down a 19-0-19 fertilizer, arbitrarily at a 3.5#/1000ft^2 since they didn't tell me a specific rate to put it down at. Now, how do I know if the levels are now corrected besides another soil test after every application? Is there no way to eliminate the guess work from fertilizing? From my interpretation, the 19-0-19 fertilizer (Nitrogen-Phosphorus-Potassium) has high nitrogen for growth, 0 Phosphorous which is good since the level is listed as "High" and high Potassium content which is good since it is listed as "Low" on the soil test results. Now I asked the owner of the seed store how you can decrease the sodium level since it is listed as an "increasing problem" and he told me I could put down gypsum. How much, I don't know. Lastly, the Calcium and Magnesium was listed as "low" in the soil test. I inquired about this, and his answer was to put down lime. However, when I brough up the fact that the PH was in the optimal range at 6.1, his answer was to put down very "light" applications of lime several times. I am really trying here and frustrated because everything seems so arbitrary. Is this just how things are with soil tests and lawns? Because i Know the seed store I go to really knows their stuff, I just wish I could get some precise figures here. Any input would be helpful. I have had many soil tests and this is just one example so I am looking for information that would help me in the long run and not just with this specific soil test. Thank you all so much.