Abstract: The mat rush （Juncus effusus L.） is a cash crop which demands large amounts of fertilizers. A field experiment was conducted to determine the effects of different fertilizer rates and application times on the yields， qualities， and partial factor productivity of applied nitrogen （PFPN） of mat rush. The results indicated that when the 100% rate of tested fertilizer was applied， and the application times were reduced from 11（conventional fertilization） to 7 times， compared with the conventional fertilization， there was significant decline in yield and PFPN， while the quality declined slightly; when application times was reduced to 9， the yield and PFPN increased slightly， and the quality improved， especially the rate of long stem （P<005）. When the application rate of tested fertilizer was reduced to 80% and 60% of total rate， the yield declined significantly， while the quality decreased in some degree， and the PFPN increased or significantly increased. The conclusion was that the tested fertilizer could help to reduce the application times for 2 times and to improve the efficiency of fertilization. The proper application rate of tested fertilizer was around 2 822 kg·hm-2.

Key words: mat rush （Juncus effusus L.）, fertilizer rate, application times, yield, quality, partial factor production of applied nitrogen （PFPN）