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This article should help with that: https://www.gardeningknowhow.com/edible/fruits/peach/fertilizing-peach-trees.htm

This article should help with that: https://www.gardeningknowhow.com/edible/fruits/peach/fertilizing-peach-trees.htm

Yes, it could have been the frost. The flowers and fruit on a tree are far more susceptible to frost damage than leaves. It may also have been poor pollination or insufficient chilling. Both of these can also cause this to happen.

I was not able to find much on this, but I have a theory. I believe that what is happening to the tree is something called buttoning. It occurs when the tree receives too little chilling (for the Elberta variety, they need 750 hours of temps under 45 F). The fruit never ripens well and are small and misshapen. Here is more information: https://www.gardeningknowhow.com/plant-problems/environmental/what-is-plant-buttoning.htm

The information you need is in Table 2 in this article: http://agrilifecdn.tamu.edu/coastalbend/files/2011/10/FruitNutSprayGuide_6.pdf

Yes, the article does actually mean 8-12 feet. But, as yours is newly planted, you will only need to go 2-3 feet out. The reason is that the roots of the plant are as wide (roughly) as the canopy. As the top of the plant gets wider, so does the roots of the plant. To make sure that it gets enough nutrients, you need to make sure that the fertilizer is spread as far out as the roots reach, which for a mature peach tree is 8-12 feet.