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首页> 外文期刊>Journal of Agricultural Science >Yield, Nitrogen Uptake and Nitrogen Leaching of Sensor-Based Fertigation-Cultured Tomato in a Shallow Groundwater Region: Effect of Shallow Groundwater on Tomato Irrigation
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Yield, Nitrogen Uptake and Nitrogen Leaching of Sensor-Based Fertigation-Cultured Tomato in a Shallow Groundwater Region: Effect of Shallow Groundwater on Tomato Irrigation

机译：浅层地下水区基于传感器的施肥栽培番茄的产量，氮素吸收和氮淋失：浅层地下水对番茄灌溉的影响

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Fertigation with surface drip has been introduced and broadly applied for vegetable cultivation in the Eastern China, which presents high precipitation and always has shallow groundwater. To estimate the influence of high groundwater level on the tomato nitrogen (N) and water use efficiency and develop new sensor-based fertigation technology, experiments were executed in plastic greenhouse in the experimental farm of Yangzhou University located in the suburban of Yangzhou city during 2016-2017 growing seasons using a block randomization with three replications. Three N dosages and 4 watering treatments were carried out in this experiment. The data indicated that irrigation threshold of -35 kPa was optimum to get the maximum production of tomato. In this treatment, the value of estimated plant evapotranspiration (ETc) was much higher than total applied water volume, suggesting high groundwater table had a significant contribution on the tomato ETc and a sensor-based irrigation strategy should be more accurate than the simulated ETc irrigation method to calculate the water demand under this condition. In addition, our results indicated that high groundwater level had a positive effect to alleviating N leaching. Finally, we can conclude that fertigation technology enhanced the N use efficiency (NUE) and water use efficiency (WUE) and three fourths of the calculated N dosage (according to a traditional nutrient equation) was sufficient to optimize tomato yield.
机译：中国东部地区已经引入了表面滴灌施肥技术，并广泛应用于蔬菜种植，该地区降水量高，地下水总是很浅。为了估算高地下水位对番茄氮（N）和水分利用效率的影响并开发新的基于传感器的施肥技术，2016年在扬州市郊区扬州大学实验农场的塑料温室中进行了实验-2017年生长季节使用了三个重复的块随机。在该实验中进行了3次N剂量和4次浇水处理。数据表明，-35 kPa的灌溉阈值是获得番茄最大产量的最佳选择。在该处理中，估计的植物蒸散量（ETc）的值远高于总施用水量，表明地下水位高对番茄ETc的贡献很大，基于传感器的灌溉策略应比模拟的ETc灌溉更为准确此条件下的需水量计算方法。此外，我们的结果表明，高地下水位对缓解氮淋失具有积极作用。最后，我们可以得出结论，施肥技术提高了氮的利用效率（NUE）和水的利用效率（WUE），计算出的氮剂量的四分之三（根据传统的养分方程式）足以优化番茄的产量。

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