Abstract: A multi-point field plot experiment about one-time fertilization schemes of single-cropping rice combined with different types of slow release nitrogen and conventional urea was conducted in Zhejiang Province, and multi-point demonstration experiment of the similar commercial products of slow-release nitrogen fertilizer was conducted in Zhejiang and Anhui Province. The results showed that with the support of the appropriate slow-release fertilizer, one-time fertilization in the lower reaches of Yangtze River could achieve the same or higher yield compared with the conventional urea application. The yield of the treatment with a ratio of 60∶40 for resin-coated urea and conventional urea received the highest average yield (8 287.6 kg·hm^-2), which was higher than that of conventional urea application (8 151.4 kg·hm^-2). The results of the multi-point demonstration experiment verified the results of the multi-point field plot experiment. Resin-coated urea treatment had a significant effect of increasing yield, with the average yield of 9 356.0 kg·hm^-2, which was increased by 9.78% as compared with the conventional fertilization treatment. Soil type affected the effect of one-time fertilization treatment. The resin-coated urea had obvious effect in most soil types, while the effect of stability fertility on different soil types was varied. The effect of one-time fertilization on the heavily clay soil was better than that on the light soil. There was significant difference in the effect of one-time fertilization on different rice varieties supported by different slow-release fertilizers.

Key words: lower reaches of the Yangtze River, single-cropping rice, one-time fertilization, yield effect, soil type, rice variety