Pot experiments were conducted to investigate the effects of controlled release
fertilizer (CRF), applyed as only one basal,
on nitrogen release and rice absorbing dynamic. It was observed that the maximum N releasing date of the CFR treatment appeared by 8th to 10th day,and the perild of sufficient N supply was maintained for 40-50d for late crops and 50-60d for early crops after peak date.However, the maximum N releasing date of the rice special
fertilizer as only one basal treatment occurred at first day to third day, and the date of sufficient N supply was maintained for 30-35d after peak date. In addition, the CRF maintained relatively higher N supply than the special rice fertilizer treatments at late stages. N supplying level the the CRF treatment in the late crops was higher than that in the early crops. In comparison to the special fertilizer either in splits or as one basal, the rate of absorption for N and P the CRF treatment was higher at whole rice growth stage, and the K absorbing rate of the CRF treatment was higher at early growth stage, but lower at medium and late growth stage. The amount of accumulating absorption for N, P and K of the CRF treatment reached maximum in the 3 fertilization treatments at harvest stage. The results also showed that the CRF treatment heightened significantly fertilizer
N utilization efficiency, and the N utilization efficiency of CRF was increased by 12.2-13.5% and 20.0-22.7% respectively, comparing to the special rice fertilizer in splits and as basal. Apart from N, and application of the CRF also increased the utilization efficiency of P and K.