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通过3年的大田试验,设置不同的氮素水平(0、75、150、300、450、600 kg·hm-2)对不同施氮量下加工番茄地上部生物量、氮素累积及利用率的动态变化进行模拟.结果表明:加工番茄地上部生物量、氮素累积量和氮素利用率随出苗后累积生理发育时间(PDT)的动态变化符合Logistic模型,氮素快速累积起始时间较地上部生物量快速累积起始时间早4~6 d(PDT);瞬时氮利用率随出苗后累积生理发育时间的动态变化呈先增加后降低的单峰曲线.不同施氮水平下,300 kg·hm-2处理的氮累积量和地上部生物量最多,产量最高.根据Quadratic模型得出,北疆地区加工番茄滴灌栽培的理论适宜施氮量为349~382 kg·hm-2.
Through three years of field experiments, the effects of different nitrogen levels (0, 75, 150, 300, 450 and 600 kg · hm-2) on the aboveground biomass, nitrogen accumulation and utilization rate The results showed that the dynamic changes of aboveground biomass, nitrogen accumulation and nitrogen use efficiency of processed tomato with PDT accorded with Logistic model, and the rapid accumulation start time of nitrogen The rapid accumulation of above-ground biomass began 4 ~ 6 d earlier (PDT), and the instantaneous nitrogen utilization showed a unimodal curve that firstly increased and then decreased with the dynamic change of cumulative physiological development time after emergence. Under different nitrogen application levels, · The hm-2 treatment had the highest nitrogen accumulation and the aboveground biomass, and the highest yield.According to the Quadratic model, the suitable nitrogen application rate for processing tomato drip irrigation in northern Xinjiang was 349 ~ 382 kg · hm-2.