Abstract:Microplot experiment was used in a paddy field to study the fate of nitrogen and its effect on rice yield when 15N-labelled goat feces and rice straw were applied alone or in combination with urea as basic fertilizer. The results showed that 15N recovery from goat feces by rice grain accounted for 7.9% and 9.2%,respectively, being equivalent to 2.2% and 2.6% of 15N in the feed-rice straw respectively. By using rice straw to feed goats and returning the goat feces to the field, 15N recovery by goat body and rice grain was 33.4% and 33.7% respectively, which was higher than 15N recovery from rice straw by rice grain (9.9% and 14.5% respecti-vely) as rice straw was applied directly to the soils.