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Discussion in 'Fertilizer Application' started by steve grubbs, Sep 7, 2011.
This lawn was treated two weeks ago with GMS and broadleaf herbicide. It is irrigated but the owner did not irrigate through June and July. If you look closely you can see the thin spots from die out. This is also the second app of GMS, it's first app was the last day of April. It's approximately 16K so less than a half gallon of GMS.
I would like to try a liquid program like yours on some of my nicer lawns. Could you clarify the individual components you use. I have access to ammoniun sulfate 21-0-0 at a reasonable price but am having trouble finding an affordable source of potassium. Could you give any brand names or sources for your mixture>
Ok. What you need first of all is a soil test. The components of the tank mix change based on calcium/magnesium requirements and soil pH. Otherwise, to answer your question about potassium, anyone used to spreading high urea granules is in for sticker shock when they start pricing potassium. I use potassium nitrate as my K source. 13-0-45. Runs around $50 a bag here. But it will cover 1-2 acres depending on the rate it is applied at. I also add a chelated micronutrient mix sold as FEature 6-0-0 from Loveland Products. This is very important because the nice green color that I get from spraying my fertilizers is not from putting down 1 lb of N. It is from the potassium helping with water management and root growth, along with more than adequate levels of micronutrients.
After reading that, I feel like a 2nd grader sitting in a Chemistry 401 class.
That's very interesting reading green doc.
On the potassium nitrate at $50, is that a 50 lb bag? I have done a little experimenting with liquid fert on my own lawn and have seen some nice things. Seriously thinking of using it on some of my high end customers who are willing to pay. I anticipate having more time next year as my current regular job may play out.
Yes, that is priced at up to $50 per 50 lb bag. Think of this in these terms: What other fertilizer you have used that covers at least an acre per bag? For me, liquid fertilizers are a way to give premium results at a reasonable price. The nearest equivalent to what I apply to a lawn would be a greens grade fertilizer made with MESA, potassium sulfate not potassium chloride, no urea, and a complete chelated micronutrient package. Have not found a granule even coming close to those specifications for less than $300 per acre. I can formulate a liquid for no more than $200 per acre where the color lasts for more than 30 days.
This pic is my test/control lawn. It receives only GMS and Gypsum for feeding.
It's 30k, receives 1gal GMS per acre 3x a year and 10lbs of Gypsum per/K in the fall. No granular fertilizer at all. It's mostley tall fescue with a bit of KBG in the back yard.