The effect of n on soil enzyme activity and microbial a ated irrigation conditions was explored. The experim levels under aerated irrigation (n0, 0 kg n ha-1 ; n150, 1 200 kg n ha-1 ; n250, 250 kg n ha-1) and a control tre tional irrigation with 250 kg n ha-1). Soil bacteria, fun abundance as well as catalase and phosphatase activi then decreased with increasing n application, with ma n200 treatment. Soil nitrifier and denitrifier microbia as urease activity increased with increasing n levels a n250 treatment. Compared with the Ck treatment, enhanced soil microbial abundance by approximately and increased soil enzyme activity by 16.67 to 22.92% tion significantly promoted plant n uptake, and the n2 the highest uptake levels. Compared with Ck, celery (n uptake in the n200 and n250 treatments were si (P < 0.05). The celery yield, n agronomic efficiency, n p cy and n recovery efficiency in the n200 treatment wer and 16.07% higher compared with the n250 treatment factor productivity in the n150 treatment was 10.35% n200 treatment yet yields decreased by 20.82%. The n2 maximum yield value, net income and ratio of output 200 kg n ha-1 application with aerated irrigation effe biological environments, increases the n utilization rat n to dry matter. Abbreviations: AE, agronomic efficiency; CK, conventional irriga DAT, days after transplant; N0, aerated irrigation with 0 kg irrigation with 150 kg N ha-1 ; N200, aerated irrigation with 200 k irrigation with 250 kg N ha-1 ; PE, physiological efficiency; PFP, p of applied N; RE, recovery efficiency. I ncreasing N application is one of the main agricultura crop yield and dry matter accumulation (Guo et al., 201 The application of synthetic N to agricultural crops via cess has aided in providing foods to an estimated half of t since the Green Revolution (Erisman et al., 2008).
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