Regarding plant care: The only ‘special needs’ plants are the blueberries. They like acid soil and regular water for best fruiting. The ammonium sulfate provides acidity and fertilizer simultaneously. If you want an organic solution, fir or sawdust mulch with a bone or blood meal fertilizer (n) will be fine. The only other guidelines: All other plants need nitrogen (n) for growth and healthy foliage. Plants that are flowering/fruiting need regular phosphorus (p) and all plants need potassium (k) for root health and hardiness. Thus most all fertilizers have N-P-K in some formula based on percentage in the bag, as in 5-0-0, 24-8-12, 16-16-16. There will also be trace minerals, iron being the most common. To simplify, most companies market fertilizer by plant type – vegetables, turf, acid lovers, flowering annuals, etc., but you can always look at the ingredients to see what mixture of N-P-K you are buying. Your soil test showed high phosphorus (that’s ok), good potassium and marginal nitrogen (which is water soluble and does not remain available in the soil like many other nutrients). So, you need to add regular nitrogen as well as other nutrients based on the type of plant (flowering/fruiting, foliage only). Spring is the time when plants need nutrients for the initial growth spurt. More is not better with fertilizer because what is not absorbed is wasted, leeched away by rains, or built up to potentially toxic levels (rarely, only with drastic over fertilization). Organics release very slowly and are more likely to be present when needed by the plants. There are also helpful soil fungi (michorrizae) that can be incorporated with fertilizers to increase rooting and beneficial microbial action. The following link resources/farm-garden/farm-garden might provide some insight.