Originally Posted by WestGaPineStraw
KN03, 13-0-45, applied at 1/4 lb per 1000 sq ft. Micros are mixed at according to the product label, each variety differs. Micro mix is what gives you the color. I have red clay acidic soils in my area. Now just the KN03 by itself is not enough nitrogen to fulfill the needs of Bermuda or zyosia but it is a great inexpensive mix for spring green up or late fall. Try it you may like it. Let greendoc chime in, he will fill you in on the rest.
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I don't want to get off track on this thread too much, so I'll keep it short.
1) If you're using 0.25# of 13-0-45/M, that comes out to 0.03# N/M and 0.11# K2O/M (0.09# K/M). That's not a lot at all. Are you intending to spoon feed (light and frequent applications)? Applying KNO3 at such a low rate really isn't giving you anything. In GA, you're probably targeting 5 to 6# N/M/yr on bermudagrass and 3.5 to 4 #N/M/yr for tall fescue. K needs are often half of N needs (depending on soils), so you would be applying 2 to 3# K2O/M/yr.
Thus, your app (for bermudagrass, as an example) is delivering only about 0.6% of your yearly N needs and about 5% of your estimated yearly K2O needs. Looks like a lot of extra money for little or no benefit.
2) You may be getting a color response from your micro product, but that is usually short-lived and only masks other issues. If you have soils too acidic for proper nutrient uptake, a liming program would help your customer much more than a cosmetic micronutrient applications and would cost less. Liming would address the root of the problem, not try to mask it. Do you have soil or tissue tests showing micronutrient deficiencies?