Abstract:

This paper studied the influence of several slow-release nitrogen fertilizer to rice yield and nitrogen fertilizer use efficiency through rice field experiment. The results showed that of Fudao slow-release Urea Coated by resin (CRU5) had highest yield and nitrogen fertilizer use efficiency in Hainan moderate fertility soils, but in late growth period appeared the phenomenon of late maturity and lodging, its nitrogen release slow, application more suitable for long growth varieties. The yield of Urea-formaldehyde slow release fertilizers (UF1) and Fudao Slow-release Urea Coated by Water-Soluble Polymer (CRU4) higher 10.47% than small particles urea, nitrogen fertilizer use efficiency increased by 6.67%-15.12%, its maturity moderate, leaves green and stem strong in late period, suitable for application. The yield of large particles urea higher 4.58% than small particles urea, nitrogen fertilizer use efficiency increased by 6.67%, and because of its low price, which could replace small particles urea and extension in rice production.