effect of nitrogen and plant spacing on nutrient uptake, quality and quantity characteristics of tuberose (polianthes tuberosa l. 'double')

tuberose (polianthes tuberosa l.) is one of the most important cut flowers in tropical and subtropical areas. this flower has forth order in cut flower and second order in bulbous plants production in iran. plant spacing and nitrogen necessity are the most important factors for tuberose quality and quantity. in this study, field experiment carried out as factorial design in randomized complete block design (rcbd) format whit 3 replications. different level of nitrogen (0, 50, 100, 150, 200 and 250 kg/ha) in ammonium nitrate was the first factor. second factor was different plant spacing (10x10, 15x15, 20x20 and 25x25 cm×cm). plant space (25×25 cm) has significant effect on flower stalk height, stem diameter, spike length, floret diameter, vase life and also nitrogen, phosphorus and potassium uptake as well. nitrogen usage as 200 kg/ha n could improved significantly growth indices and yield of tuberose as flower stalk height, stem diameter, spike length and nitrogen uptake.