Effect of N application rates on nutrients accumulation, transformation and yield of Chrysanthemum morifolium

Aimed to determine the optimal N application rate, a series of field trials were carried out to investigate the effects of different N application rates on the yields, nutrient distribution and nutrient transformation in Chrysanthemum morifolium. Five N application levels: 0 kg/ha(N0), 90 kg/ha(N1), 120 kg/ha(N2), 150 kg/ha(N3)and 180 kg/ha(N4)were set up with five replications. The area of each plot was 0.8 m×15 m. The results indicated that different N application rates significantly affected dry matter and nutrition accumulations at different growth stages, but did not affect the tendency of accumulation. The order of the accumulation of N, P and K throughout the whole growth period was: K＞N＞P. N application rates affected transfer efficiency and distribution ratio of N, P and K in different organs. The highest transfer efficiency and distribution rate was found in N0 followed by N3. The order of transfer efficiency of N, P and K was: P＞N＞K. At the deflowering stage, the distribution rates of N and P was: stem＞flower＞leaf＞root, but the distribution of K was: stem＞flower＞root＞leaf. The yield was ranged from 1746.23 kg/ha to 2211.3 kg/ha, the highest yield was found in N3(150 kg/ha). Under this experimental conditions, the recommended N application for Chrysanthemum morifolium was 150 kg/ha.