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How to choose organic fertilizer 
Test your soil. 
In order to choose the right organic fertilizer for your garden, you need to know the composition of your existing soil. There are a variety of tests that you can do, such as tests for ph, nitrogen, and phosphorus.

OPTIONS:
 +Look for a soil mix with a high nitrogen content. The ph of the soil needs to be the exact ratio of nitrogen and phosphorus in your soil, which should be determined by test results.;
 +Since nitrogen is normally the highest fertilizer for your garden, you may want to balance out this with the amount you find the most beneficial, usually based on your climate. Ask a local farmer to tell you about the soil composition of your vegetables and grass.;
 +Each test will have a unique set of numbers and attributes that you must factor into your soil. Keep in mind that the ingredients used in those tests vary from crop to crop, so do some math to find the recommended potency and saturation for your soil.;
 +These will let you know the status of different components of your soil. Soil test kits for specific aspects of your soil are available at garden supply centers.;
These will let you know the status of different components of your soil. Soil test kits for specific aspects of your soil are available at garden supply centers.