A field experiment,under organic planting system in sunlight greenhouse in suburb of Beijing,China,was carried out to study the effects of different water and organic fertilizer managements on N use efficiency,N balance and nitrate leaching in 0~90 cm layer of soil profile.The results showed that compared with local farmers' conventional management of water and fertilizer,the half cut of organic fertilizer inputs would decrease accumulation of nitrate in soil profile,and decrease the amount of nitrate leach...