Lawn Care - Knowledgebase Question

peoria, Il
Question by Joseph_Malon
May 31, 2010
Customer is trying to grow grass in some areas of his lawn that for some reason will not grow. He did a soil test and his PH is very high, Nitrogen is light orange, and Phoserous is light brown. Can you give us direction on what he should apply to his lawn to get the grass to grow.

Answer from NGA
May 31, 2010


There are a number of things that can keep a lawn from thriving. Lack of sunshine is one (grass doesn't grow well in the shade); poor soil drainage (soggy roots will suffocate); compacted soils (roots can't penetrate the soil); pH that's out of whack (soil pH that is too high or too low can bind up nutrients and make them unavailable to plant roots), excessive use of herbicides or other chemicals. Any or all of these might be contributing to the problem. High pH - over 7.5 - can keep grass from growing well and remaining green. Applying elemental sulfur will bring the pH down. How much you need to apply will depend upon the pH test reading. Don't apply more than 10 pounds of sulfur per 1000 square feet or you'll run into a problem with the soil. It's better to start with a smaller amount and see if that lowers the pH enough for grass to grow. Hope this information is helpful.

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