If the micronutrients were present in the materials you composted, they'll be present in the compost.

Compost is a very stable source of many nutrients which are difficult to find with the soil tests today because these nutrients are not very soluble. How good your compost is depends on what you put into it and the wider variety of materials used the better, more nutrients, that compost would have. Testing for micro nutrients is expensive and is why it is not often done, but if your soil pH is in balance and the rest of the nutrients are in the optimal range, on a good soil test, and there is sufficient organic matter in the soil, the micro nutrients will be there in the numbers that matter.

Cheffrank asked:

Assuming one follows the correct "guidelines" for composting, will the resulting compost have the micro-nutrients (Boron, Manganese, Magnesium and Sulfur) necessary for a healthy soil, or will the addition of fertilizers be necessary to make these available to the plants.

The short answer is that the compost may, or the compost may not contain all the nutrients needed for a healthy soil. Having a diverse amount of ingredients of organic matter may give all the minerals you want, however most of our foods and soils are lacking in minerals. If the minerals are missing from the start, how are they going to get into the food I am tossing on my compost pile? Like they say, garbage in-garbage out. The only way to insure all the nutrients are there is to put them there yourself, then you will know for sure.

I have also read the advice posted here that really only good compost additions, fish emulsion and kelp are sufficient. ( I do use these supplements)

That comment you trusted in was an opinion, not a fact as you have found out. What is healthy growth for one gardener may be the most piss poor crop one has ever seen; it is a matter of opinion. What it sounds like Cheffrank is that you need an organic "booster shot" to get you going. I would suggest you brew up a batch of alfalfa tea for your vegetables that are not performing or tasting the way you desire.

While you are waiting for the alfalfa tea to brew up (about 4 days) to full potential, you can make a quick batch of compost tea and use as a foliar spray to perk up those plants that "just don't look quite right". Trusting that you have a good batch of compost (I am sure you do), take a couple of big handfuls and put them in a 5-gallon bucket. Add to it some brown sugar or molasses (not quite a handful to feed the bacteria), and the same amount of corn meal (for the fungi) and add it to the bucket, add two tablespoons of seaweed/kelp too. Stir it around every couple hours or so and let it brew. Tomorrow morning strain it into a sprayer (bottle or one of those cheap pump sprayers) and mist down, on both sides of the leaf and stalks, all your plants. The plants should look a lot better by noon tomorrow.

When the alfalfa tea is ready pour two gallons in a 5-gallon bucket, add two gallons of water to that, then pour about a quart on the soil around each plant. The next day your garden will put a big smile on your face. For the long term you are looking to remineralize your soil. This will insure your vegetables will have all the nutrients they require based on their needs and choices, not some soil test that is lacking as you have seen. There are a number of mineral sources that can be used, the choice really boils down to how easy they can be obtained and cost. If nutrition is important to you cost will not matter much, your choices will be more abundant. The link below leads to sources of minerals (I am not connected with any company listed). And too, the home website of that page (Remineralize the Earth) may provide information of interest. There are many more things one can do to get the results they desire; it is a matter of getting the right information by asking the right question. And that Cheffrank, can be tricky...

Blutranes

Here is a link that might be useful: Mineral Resources

My goodness, I had no idea that gardening was so complicated and required so much specialized equipment and input!

Yep, it really does. You must have been busy testing compost when it happened. Sometimes testing compost is not the best way to spend ones time?

Ummmm, Cheffrank,

When/if we make our compost tea, we will fill the bucket with water, right? I thought so...

Blutranes

Thanks all for the input. I should have given further information. My compost, I believe, is varied in composition, and I make quite alot of it. I do make compost tea, pretty much as blutranes described, minus the cornmeal, which I will add next batch. Haven't yet made the alfala tea, but will. I should have noted that, aside from the carrots, all the vegetables are picture perfect to my eye: Beautiful green, blemish free foliage,nice heads of broccoli, fennel knobs developed. I just have a feeling that something might need boosting. And I am basing that on primarily two things:
1) However beautiful, the vegetables take quite a long time to develop. The romaine lettuce for example, having been in the ground since mid-April(I started them in the green-hut earlier on) still aren't nice full heads, and we are getting to the point where they may just bolt before they do, and 2). Flavor!. While the broccoli is beautiful, as is the fennel, they seem just a little flat, so to speak. So my thoughts were to the micro nutrients.
The garden is head and shoulders above where it was years ago, thanks to this forum and others, but still not quite there, so I mainly ask so I can take this up another level.
It is a lifelong journey, this gardening, and in order to continue my education, I will note the above comments, and any other thoughts, and incorporate them into my practices.
Thanks Again