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Old 11-09-2013, 11:03 AM
Victorsaur Victorsaur is offline
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Flaws of super phosphate

Interesting article.. makes me wonder the best source of phosphate fertilizer.

http://www.malcolmbeck.com/articles/...dsolutions.htm
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Old 11-09-2013, 03:32 PM
greendoctor greendoctor is online now
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Applying too much phosphorus, irregardless of source is not wise. Triple superphosphate simply made it cheaper and easier to do so. I get sky high P levels on a regular basis due to past misuse of 16-15-15, 10-30-10 or 10-20-20 AG fertilizers on lawns and landscapes. That does create the micronutrient deficiencies described in that link. Do not get the idea that adding micronutrients to the soil will fix the problem. High phosphorus levels in the plant tissues themselves bind to the micronutrients no matter how much is applied to the soil. What is applied in granules with micronutrients added is a fraction of the actual need. Do you know of any granule applying the equivalent of 1 lb ferrous sulfate and 4 oz zinc sulfate at label recommended rates. Those granules are ok for maintenance of areas where there are no problems. Not so much for deficiencies and imbalances.
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Old 11-09-2013, 03:39 PM
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For the most part P is largely banned around here. Misplaced blame led to that.
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Old 11-09-2013, 04:03 PM
greendoctor greendoctor is online now
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Has the source of P pollution in Florida been determined by a disinterested party? I think making grass starve and thin out during the wet season is hardly a way to prevent pollution. Hawaii is a little smarter. The regulators go after soil runoff entering waterways. That's right. Construction sites of any size must not allow dirt to run. There is a requirement to maintain vegetation on errodable slopes. Inspectors will respond to any reports of soil running down drains.
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Old 11-09-2013, 04:50 PM
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I believe so. A new house is going up across the street and the first thing in was the plastic dam and haybales around the storm drain.
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Old 11-09-2013, 04:54 PM
greendoctor greendoctor is online now
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So what is the difference between excavated ground and a lawn so thin from starvation that the soil washes out? Arbitrary bans on fertilization are counterproductive.
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Old 11-09-2013, 11:09 PM
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Quote:
Originally Posted by greendoctor View Post
So what is the difference between excavated ground and a lawn so thin from starvation that the soil washes out? Arbitrary bans on fertilization are counterproductive.
Any suggestions for a substitution? I know its been largely overdone in some spots, but I'm sure some areas are truly deficient.
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Old 11-09-2013, 11:45 PM
greendoctor greendoctor is online now
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Lift the bans. No substitute for N and P. I can see harm in feeding K only in isolation as is mandated by Florida laws. Remember that K and Na are not that far apart.
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Old 11-11-2013, 10:55 PM
Victorsaur Victorsaur is offline
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So GD, would you know of any alternatives to super phosphate besides DAP or what would you recommend? If I understand you correctly it doesn't matter what source the P comes from for the most part as it bonds (at a molecular level?). Another thing about phosphorous is the the issue of its' permeability, especially in clay or compacted soils, which is why I'm guessing I don't see many people going with the larger rock phosphate on established lawns. It seems like guano is a viable organic alternative. Thanks again for your valuable input and knowledge on these subjects.
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Old 11-12-2013, 12:38 AM
greendoctor greendoctor is online now
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I like MKP or else 0-60-20. Both are soluble. There is some soil bypass if applied foliar. 0-60-20 will also chelate micronutrients because when placed in water, it turns into phosphoric acid and potassium phosphate. Neither of those are to be applied unless soil testing, tissue testing, and/or visual symptoms demonstrate need. I am from the school of spoon feeding. Do not believe in huge applications of fertilizer a handful of time per year. Would never work in my area. 12 month growing season.
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