Excessive nitrogen inputs and inappropriate irrigation regimes are two major problems in protected vegetable cropping systems, including tomato production, in the suburbs of Beijing.These practices can lead to deterioration in vegetable quality and contamination of groundwater. The objectives of the present study were: 1) to develop N target value for efficient N management of protected tomato, 2) to compare the effects of furrow irrigation and drip irrigation on tomato growth and N utilization,...