Generally, nitrogen fertilizer for cut flowers should beapplied on the basis of 1-2 lbs. of actual nitrogen per 1,000 sq. ft.
Somelarge and fast-growing annuals like sunflowers may need more, and a slightlyhigher rate may be needed on sandy soils or where irrigation or rainfall ratesare high.
Nitrogen (N), phosphorus (P) and potassium (K) are essential macronutrients needed for healthy productive crops and receive a great deal of attention, but a balanced crop nutrition program will also look at secondary and micronutrients.
Most fertilizers that are commonly used in agriculture contain the three basic plant nutrients: nitrogen, phosphorus, and potassium.
Some fertilizers also contain certain "micronutrients," such as zinc and other metals, that are necessary for plant growth.