If wondering about soil nutrients on your site sample your soil and have it analyzed.

Theoretically, newly planted bulbs need no additional fertilization given a decent soil condition at planting - all the nutrients needed for both foliage and flowers are already contained in the bulb. Fertilization instructions provided by the International Bulb Society mirror this contention. In subsequent seasons, some supplemental fertilization may be required but this is often addressed just by mulching with a good quality organic mulch, like compost or composted manures.

If one chooses to supplement with a packaged fert, it is always a good idea to have your soils tested first then apply what may be lacking. Barring that, an application of a balanced or all-purpose fertilizer in spring as the foliage emerges is suggested. Do not fertilize too close to flowering and be sure to leave foliage in place after flowering until fully ripened so that the bulb is able to photosynthesize properly and replenish its nutrient stores.

and fwiw, most soils are not potassium deficient, unless very sandy or heavily cropped.