grass - Knowledgebase Question

Bellflower, CA (Zone 10)
Question by qmawiggs
July 24, 2007
how do i keep saint augustine green

Answer from NGA
July 24, 2007


If the lawn is pale or yellowish, the problem is iron chlorosis due to high pH soils. Other contributing factors include high phosphorus levels (the middle number on a fertilizer bag), and cool and/or wet soil conditions. Fertilize you turf with 21-0-0, an acidifying fertilizer at a rate of 5 pounds per 1,000 square feet in mid-April and June. Then in mid-October, use a product similar to 15-5-10 at a rate of 7 pounds per 1,000 square feet. Return your clippings to the turf by mowing with a mulching mower. Water only every 5-7 days applying 1/2 to 1 inch of water when you do. A coffee can or rain gauge can be used to determine how long it takes to apply this amount. Chelated iron products can be used as a quick fix to the iron deficiency. Applying a pound of wettable sulfur per 100 square feet through a hose end sprayer is another good idea to help in the longer term. This should be done in early spring and again in late fall when temperatures are cooler.

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