To rationalize nitrogen application aiming at high yield,good quality,low pollution and high nitrogen use efficiency effects of nitrogen rates on yield and quality and nitrogen use efficiency of asparagus lettuce were studied by way of using N trace technique in pot experiment.The results showed that the correlation between nitrogen rates and 15 yield of Asparagus lettuce followed regression equation ?=104.21+2 476.31x-5 181.97x2 indicating yield increased and decreased in order accompanied by the increasing of nitrogen application;the adequate nitrogen rates could improve quality of asparagus...