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: KNP.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: PNK.At the deflowering stage,the distribution rates of N and P was: stemflowerleafroot,but the distribution of K was: stemflowerrootleaf.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.