不同施氮水平下加工番茄植株生长和氮素积累与利用率的动态模拟

Dynamics simulation on plant growth,N accumulation and utilization of processing tomato at different N fertilization rates

通过3年的大田试验，设置不同的氮素水平（0、75、150、300、450、600kg·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4～6d（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，300kg·hm。处理的氮累积量和地上部生物量最多，产量最高．根据Quad．ratic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349～382kg·h-2．

Three field experiments were conducted to simulate the dynamics of aboveground bio- mass, N accumulation and utilization of drip-irrigated processing tomatoes at different N fertilization rates （0, 75, 150,300,450, or 600 kg· hm-2）. The results showed that Logistic models best de- scribed the changes in aboveground biomass, N accumulation, and utilization of accumulated N effi- ciency with the physiological development time （PDT）. Rapid accumulation of N began about 4- 6 d （PDT） earlier than the rapid accumulation of aboveground biomass. The momentary utilization rate of N （NMUR） increased after emergence, reached a single peak, and then decreased. The N accumulation, aboveground biomass and yield were highest in the 300 kg ~ hm-2 treatment. The quadratic model indicated that application rate of 349 to 382 kg N ~ hm-2 was optimum for drip- irrigated processing tomatoes in northern Xinjiang.