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Not sure on the per hectare part, as different brands of fertilizer have different strengths, but for crocus, you want to look for something a little higher in phosphorous to help with blooming better.

You can go ahead and plant them now. They will not bloom this year but they will be fine in the ground.

If this is not an option, simply treat them as a houseplant until the foliage dies back, then place them pots and all in a dry place and let them dry out. In the fall, take them out of the dry potting soil and plant them in the ground.

It depends on where you live and what variety of bulb you plant. Say, a hardy bulb like a daffodil, the bulb replenishes itself after it blooms and also makes bulblets, which are small baby bulbs. These small bulbs will grow to full size bulbs and thus the dafodill bulb multiplies.

They bloom in the spring. Since you planted them in the spring, they will likely not bloom until the following spring.

Crocus are easy care plants and established plants pretty much take care of themselves. Crocus prefer their soil damper in the spring and fall, but somewhat dry during the summer. Rainfall is normally enough for these little jewels but you may need to give them a bit whenever conditions in spring or fall become drought like.

These are normally planted in the fall but if you live in an ideal climate, it shouldn't hurt to plant them in spring. This article should help you: https://www.gardeningknowhow.com/ornamental/bulbs/crocus/how-to-plant-crocuses-and-proper-crocus-flower-care.htm