Question
Hi--

I have noticed that many regular lawn fertilizers are now phosphate-free.  I planted grass seeds last fall (in N.J.) and was looking for a fertilizer (other than starter fertilizer) with a "middle number" other than zero to promote strong root growth, for example, 30-4-3 rather than 30-0-3.

Do you know why they are rare and do you have any suggestions other than using a starter fertilizer?

Thanks.

Answer
The absence off P hosphorus in fertilizer mixtures is the result of efforts to limit the amount of phosphorus that gets into lakes, rivers and streams. The benefits of this program far outweigh the disadvantages.
However, you can obtain permission to apply the element; you have to provide the results of soil analysis which show a deficiency of the element.
Bear in mind that phosphorus can be in the ground but unavailable to the plant; very often pH is the limiting factor. Correcting the pH is the remedy in such a case. Again, a soil analysis will show this.
Phosphate deficiency in seedlings can be indicated by a 'purplish' discoloration of the youngest leaves at the growing point. You have to look keenly, often with the aid of a magnifier. A soil test is still required.