9ad2be2e_Organic_Lawn_Care_Guide__1
[0] Any time during growing season [2] Get to know your soil. We offer a range of convenient soil tests which come with a pre-paid box addressed to our testing service. You get an informative report and organic recommendations for your soil. We recommend this as a starting point. Typically the test indicates the acidity (pH), the presence of main nutrients (nitrogen, phosphorus and potassium), micronutrients, and organic matter. It'll point out any important deficiences, which you can then take steps to correct. If the soil test indicates low organic activity in your soil (fairly common with sandy soil), you can top-dress with 1/4 inches of compost end the beginning and end of the season. You can also use Nature's Turf (8-1-9) to promote your soil life. [3] Healthy soil requires lots of biological activity in the form of earthworms and microorganisms. Biological activity requires adequate organic matter to flourish. [1] 
Soil test
Organic Lawn Care Guide
1