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Colorado

this might have been discussed before, but hopefully not...

when looking at phosphite containing products, do you consider the "P" to be plant available as a fertilizer? My main question is, if I used a lot of phosphite-based products, do I have to worry about over-doing it on the "P" that I am supplying to my plants? thanks.

3/25/2013 4:49:46 PM

Germany

Probably not within one season. Just take the soil calculator and get a rough idea of how much phosphite P you would be going to add to the whole patch area and which increase in total P it would bring about. Even if all the phosphite you added would eventually turn into phosphate (the important P as fertilizer), it should be a minor contribution to your soils total P content. (My opinion!...no idea how much of the phosphites you want to add.)

3/25/2013 5:29:21 PM

Sourthern Utah

pete ,, we have used ,, tko phosphite and tko recover the last couple of yrs ,, P didnt ever seem to be to nutz,, as far as the soil tests have shown

3/25/2013 5:33:34 PM

Glosta

If the P in Tko Phosphite was even available right away one gallon per 1000 sq ft would give 27 ppm of P and 41 ppm of K. You would really have to be soaking the soil with it for the P build up to be of any significant concern. The fact that phospjhite needs to be converted for uptake makes this even a less of a concern. And the sheer amount of K that the pumpkins use makes the K not a concern in the soil.

However this being said, most of the time we use this product as a foliar and needs to used in the correct manner. misapplication can cause deficiencies of other nutrients by means of nutrient imbalances internally in the plant.

3/25/2013 8:19:31 PM