Abstract:

The effects of application of slow/controlled release fertilizer on rice growth, rice grain yield and utilization efficiency of nitrogen were studied through a field experiment. The results showed that, the same amounts of slow/controlled release fertilizer improved tiller number, the population quality of rice and increased the chlorophyll content of rice leaves at middle and late growth phase, especially in the grain filling stage, which resulted in higher effective tiller and filled grain, compared with CK. The rice grain yield was 9233.3-9725.0 kg/hm2 with the application of slow/controlled release fertilizer, which increased by 5.5%-11.1% (P < 0.01), compared with the same amounts of compound fertilizer. Utilization efficiency of nitrogen and agronomic efficiency of nitrogen applied slow/controlled release fertilizer were 18.9%-22.9%, 2.9%-5.9% respectively higher than those with the application of compound fertilizer. In conclusion, higher rice yield and utilization efficiency of nitrogen were obtained when slow/controlled release fertilizer was applied to paddy field in south Henan province.