| To explore the water and fertilizer coupling model for efficient production of processing tomato under brackish water drip irrigation in northern Xinjiang, this experiment was conducted on processing tomato ‘Jinfan 3166’ with three water irrigation levels of 5 200(W1), 4 500 m3·hm-2(W2) and 3 600 m3·hm-2 (W3), three N application levels of 300(N1), 240 kg·hm-2(N2) and 180 kg·hm-2 (N3), and three salinity levels of 1(S1), 3 g·L-1(S2) and 5 g·L-1 (S3).The effects of irrigation amount, salinity and nitrogen application on the growth, yield and water and fertilizer use efficiency of drip irrigation processing tomato were studied by L9 (33) orthogonal test design.The results showed that aboveground dry matter accumulation in the W1N2S2 treatment reached a maximum (195.52 g·plant-1) at the fruit expansion stage under brackish water irrigation. Compared with W1N1S1, yield and irrigation water use efficiency decreased by 17.85%, 27.19% and 17.84%, 27.16% under W1N2S2 and W1N3S3 treatments, respectively, and nitrogen partial factor productivity increased by 6.11% and 25.40%, respectively. Considering the growth, quality, yield and water and fertilizer utilization efficiency of processing tomato, the influencing order of each factor was: irrigation amount > salinity > nitrogen application amount. Based on the comprehensive scoring method to evaluate each index, [JP]the optimal coupling mode of water, fertilizer and salt was W1N3S3 and W1N2S2. |