The effect of NPK fertilizer with different nitrogen solubility on growth, nutrient uptake and use by chrysanthemum

摘要

The effect of nitrogen, phosphorus and potassium (NPK) fertilizer with different nitrogen forms on N, P, K use, uptake and growth of potted chrysanthemum plants during three vegetation phases was observed in two - years experiment. In the experiment, NPK fertilizer with slow soluble nutrients with different nitrogen forms: ureaform, (IBDU) isobutyledenediurea and melamin, was used. At control treatment the identical fertilizer was applied but the nitrogen was in ammonia and urea forms as usually used in horticulture. The experiment clearly showed the positive effect of NPK fertilizer containing half nitrogen amount in ureaform, on growth and plant nutrient uptake. This effect of nitrogen ureaform was confirmed by both the highest uptake of N, P, K and the highest yield of biomass. The NPK fertilizer with half nitrogen content in ureaform ensured optimal nutrient release according chrysanthemum nutrient requirement.