In order to provide a theoretical basis for nitrogen (N) application in tomato soil testing, the abundance-deficiency index (ADI) of soil N and the recommended N fertilizer application rate (RNFAR) for tomatoes in China were established by using the method of integrating piecemeal experiment data and the new application formula of nutrient balance-soil fertility difference subtraction. The results showed that ADIs of soil alkaline hydrolysis N for tomatoes in China from the 1^st to 7^th levels were ≥303.1, 189.5–303.1, 118.5–189.5, 74.1–118.5, 46.3–74.1, 29.0–46.3 and <29.0 mg/kg, respectively; ADIs of soil total N for tomatoes in China from the 1^st to 7^th levels were ≥3.0, 2.0–3.0, 1.3–2.0, 0.8–1.3, 0.6–0.8, 0.4–0.6 and <0.4 g/kg, respectively; ADIs of soil organic matter (all fields) for tomatoes in China from the 1^st to 6^th levels were ≥77.3, 36.6–77.3, 17.4–36.6, 8.2–17.4, 3.9–8.2 and <3.9 g/kg, respectively; ADIs of soil organic matter (open fields) for tomatoes in China from the 1^st to 7^th levels were ≥55.3, 32.8–55.3, 19.4–32.8, 11.5–19.4, 6.8–11.5, 4.1–6.8 and <4.1 g/kg, respectively; ADIs of soil organic matter (facility fields) for tomato planting in China from the 1^st to 4^th levels were ≥43.4, 14.6–43.4, 4.9–14.6 and <4.9 g/kg, respectively. When N fertilizer use efficiency was 40% in tomato season and projected tomato yield was 120 t/hm², RNFAR from the 1^st to 7^th levels of soil N abundance-deficiency were 0, 81, 162, 243, 324, 405 and 486 kg/hm², respectively.