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What to spray with?
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<blockquote data-quote="Dave" data-source="post: 172396" data-attributes="member: 498"><p>The idea that a 10-10-10 fertilizer is 70 percent filler is wrong. That is the percent of N-P-K. They all come in different forms. The conversion factor for P2O5 to P is 2.29, so if there is 10 pounds of P and it is in the form of P2O5 there is 22.9 pounds. There are fillers added in some cases but at no where near the rate that you at claiming.</p><p>As for soil microbs making phosphorous more avialable. That is possible although not too probable but the proper pH has the greatest effect on phosphorous availability. However, the plants are not going to use the phosphorous to make more sugar and thus remove more phosphorous. Phosphorous is primarily used by the plant for root growth and not used for sugar production. This is why there is little removal of excess P. It remains in the roots which eventually die off and the P returns to the soil. </p><p>I don't work for a chemical or fertilizer but I am a certified crop adviser from the American Society of Agronomy. I know enough about agronomy, nutrients, plant growth, etc to say there is some limited truth in the claims but there is also a lot of snake oil. I see more snake oil than I do truth.</p><p>Dave</p></blockquote><p></p>
[QUOTE="Dave, post: 172396, member: 498"] The idea that a 10-10-10 fertilizer is 70 percent filler is wrong. That is the percent of N-P-K. They all come in different forms. The conversion factor for P2O5 to P is 2.29, so if there is 10 pounds of P and it is in the form of P2O5 there is 22.9 pounds. There are fillers added in some cases but at no where near the rate that you at claiming. As for soil microbs making phosphorous more avialable. That is possible although not too probable but the proper pH has the greatest effect on phosphorous availability. However, the plants are not going to use the phosphorous to make more sugar and thus remove more phosphorous. Phosphorous is primarily used by the plant for root growth and not used for sugar production. This is why there is little removal of excess P. It remains in the roots which eventually die off and the P returns to the soil. I don't work for a chemical or fertilizer but I am a certified crop adviser from the American Society of Agronomy. I know enough about agronomy, nutrients, plant growth, etc to say there is some limited truth in the claims but there is also a lot of snake oil. I see more snake oil than I do truth. Dave [/QUOTE]
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