关键词: 杭白菊, 控释尿素, 尿素

Abstract: Field experiment was conducted to study the effects of applying conventional urea，
conventional urea combined with controlled-release urea on Chrysanthemum morifolium yield and
nitrogen use efficiency. Six treatments with three replications were set up，i.e.，control（CK₁₁），no nitrogen
fertilizer applied；Suitable fertilization rate including single conventional urea（N₁₁），controlled-release
urea combined with conventional urea（N₁₂），control（CK₂₂），no nitrogen fertilizer applied，phosphorous
and potassium saved 1/4；Fertilization rate saved 1/4 including conventional urea（N₂₁），controlled-urea
combined with conventional urea（N₂₂）. Results showed that applying nitrogen fertilization increased
inflorescence diameter，inflorescence numbers per plant and dry weight per inflorescence significantly as
compared with control. At harvesting stage，controlled-release urea combined with conventional urea
decreased nitrogen distribution ratio to stem and leaf，and increased that to inflorescence comparing with
single conventional urea under same fertilization rate，this indicated that controlled-release urea combined
with conventional urea was more favorable to nitrogen allotting to inflorescence，and increased yield. Yield
under suitable fertilization rate was higher than fertilization rate saved 1/4. Under suitable fertilizer rate，
controlled-release urea combined with conventional urea increased yield by 87.96 kg · hm^-2 compared with
single conventional urea，and 124.99 kg · hm^-2 higher compared with the same nitrogen fertilization mode
under fertilization saved 1/4. Nitrogen use efficiency treated by suitable fertilization rate was higher than
that of treated by fertilization saved 1/4 under the same nitrogen fertilization mode，while nitrogen
agricultural use efficiency displayed reverse tendency. Both nitrogen use efficiency and nitrogen
agricultural use efficiency treated by controlled-urea combined with conventional urea were significantly
higher than those of treated by single conventional urea under the same fertilization rate. Considering from
economic and practical view，controlled-release urea combined with conventional urea under suitable
fertilizer rate was the best nitrogen fertilization mode，namely the suitable nitrogen fertilization rate was
120 kg · hm-2. 50% of the total was used as basal，which was controlled-release urea（150 d）combined with
conventional urea at the ratio of 1︰1；50% of the total was used as dressing at vigorous stage，which was
controlled-release urea（90 d）combined with conventional urea at the ratio of 1︰1.

Key words: Chrysanthemum morifolium, controlled-release urea, conventional urea