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The purpose of this study is to investigate the interactions between irrigation and fertilizer treatments on soil NO 3   − -N content and vertical distribution under drip fertigation in greenhouse tomatoes. Randomized block design with three replications and the treatments consisting of three levels of irrigation and three levels of N fertilizer were used. Three irrigation levels were W1 (100%  ET 0 ), W2 (75%  ET 0 ), and W3 (50%  ET 0 ) and fertilizer levels were F1 (N240–P 2 O 5 120–K 2 O150 kg hm −2 ), F2 (N180–P 2 O 5 90–K 2 O112.5 kg hm −2 ), and F3 (N120–P 2 O 5 60–K 2 O75 kg hm −2 ). The result demonstrates that dynamics of soil NO 3   − -N and its response to drip fertigation and levels of N moved toward the fore soil moist, and the average soil NO 3   − -N content with W3 treatment was 1.23 times higher than that of the W1 treatment in 0–60 cm at 43 days after transplanting. The negative correlation between N use efficiency and levels of fertilizer N and the N recovery efficiency was increased with increases of N fertilizer application. The fertilizer nitrogen rate greatly significantly influenced soil NO 3   − -N content. Avoiding N leaching through controlled matching N fertilizer application and controlled irrigation to tomato N demand is the key to maintain crop yield and improve N use efficiency.

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Effects of Irrigation and Nitrogen Fertilizer Input Levels on Soil<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msup><mml:mrow><mml:msub><mml:mrow><mml:mtext>NO</mml:mtext></mml:mrow><mml:mrow><mml:mtext>3</mml:mtext></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:mo>-</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-N Content and Vertical Distribution in Greenhouse Tomato (<i>Lycopersicum esculentum</i>Mill.)

Effects of Irrigation and Nitrogen Fertilizer Input Levels on SoilNO3--N Content and Vertical Distribution in Greenhouse Tomato (Lycopersicum esculentumMill.)