Fertilizer affects bulbs down multiple years

The subject came up about n. Obvalaris blooming GREAT the first year and then dwindling down to a few blooms.
Last year I showed photos of some of our daffodils planted in soil with a PH of 4.5 and with soil tests showing almost no nutrients left after intensive cotton farming back from the 1800’s till about 1935.
I told and showed shot where I only added a blend of Urea Nitrogen and Ammonium Sulfate or 33% available N. LOTS of you all wrote telling me I probably had killed my daffodils and you all wanted shots of these groups after another year.
Now these are mostly basal rot resistant daffodils on this side of the creek and again in 2009 I ONLY added the nitrogen which increased the amount of leaf growth which allowed the daffodils to capture more energy from the sun and produce bigger and more bulbs and we got INCREDIBLE bloom on these bulbs that have been down I guess five or six years now.
Again I am not saying to go out and dump fertilizer but we need to ALL get soil samples taken and look at the N-P-K and macro nutrients and ANY of us can take blocks of the same daffodils and tweak our soil nutrients and with digital cameras easily record this year after year.
The big drift of Snow Flakes the other day were left overs from digging in 2007 and ALL of the bulbs in that section laid in our garage UNTIL Feb. 8, 2008 and were planted on “new” soil. Or soil we had tilled and amended for two years prior to planting. The Snow Flakes are already going to have to be divided again. These are only about 1/3 of what started out as a couple of clumps back in 1984. Keith Kridler Mt. Pleasant, Texas Oh the bloom time is still off, or about 19 days later than in 2009 across our fields. #7116 is from March 10, 2009 #185 is from March 29, 2010