Method for accurately applying nitrogen fertilizer in whole growth period of chrysanthemum morifolium

The invention discloses a method for accurately applying nitrogen fertilizer in the whole growth period of chrysanthemum morifolium. Comprising the following steps: a, a seedling stage: entering the seedling stage after rooting and seedling recovery of the cut-flower chrysanthemum, and managing nitrogen fertilizer at 4-8mg/(plant * day) during the period; b, a vigorous growth period: after row sealing of the cut-flower chrysanthemum canopies, the overground part rapidly grows and enters the vigorous growth period, and the nitrogen fertilizer is managed to be 8-12 mg nitrogen per plant * day during the vigorous growth period; c, a flower bud differentiation stage: after the cut-flower chrysanthemum stops lighting, the cut-flower chrysanthemum enters the flower bud differentiation stage, only clear water is irrigated in the first week of flower bud differentiation, conversion of vegetative growth to reproductive growth of the cut-flower chrysanthemum is promoted, and then nitrogen fertilizer is managed to be 2-