Development of field mobile soil nitrate sensor technology to facilitate precision fertilizer management
Development of field mobile soil nitrate sensor technology to facilitate precision fertilizer management
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DOI：
10.1007/s11119-018-9579-0
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发表时间：
2019-02-01
影响因子：
6.2
通讯作者：
Bond, Leonard J.
中科院分区：
文献类型：
--
作者：
Rogovska, Natalia;Laird, David A.;Bond, Leonard J.
精确的氮肥管理有可能提高氮肥的使用效率，同时降低农民的投入成本和作物生产的场外环境影响。虽然技术可用于在田间空间上改变侧施氮肥施用率，但缺乏能够以足够的精度实时和持续测量土壤硝酸盐（NO3-）水平以促进氮肥精确施用的传感器技术。评价了金刚石衰减全内反射（D-ATR）傅里叶变换红外（FTIR）光谱作为土壤NO（3）（-）传感器的潜力。测试了两个独立的数据集：（1）现场数据集包括从四个农业领域收集的124个GPS注册土壤样本;（2）实验室数据集包括五种不同的土壤，掺入不同数量的KNO 3（135个样本），并在实验室中培养。使用配备有D-ATR池的Agilent 4100 Exoscan FTIR光谱仪收集光谱，并使用偏最小二乘回归进行分析。校准R（2）值（D-ATR-FTIR预测值与独立测量的土壤NO（3）（-）浓度）为0.83和0.90 RMSE分别为8.3和8.8mgkg（-1）;和稳健的留一田/土壤交叉验证试验得出的田间和实验室数据集的R-2值分别为0.65和0.83（RMSE分别为12.5和13.3mgkg（-1））。研究表明，D-ATR-FTIR光谱用于快速现场移动测定土壤NO3（-）浓度的潜力。
Precision nitrogen (N) fertilizer management has the potential to improve N fertilizer use efficiency, simultaneously reducing the cost of inputs for farmers and the off-site environmental impact of crop production. Although technology is available to spatially vary sidedress N fertilizer application rates within fields, sensor technology capable of measuring soil nitrate (NO3-) levels in-real-time and on-the-go with sufficient accuracy to facilitate precision application of N fertilizers is lacking. The potential of Diamond-Attenuated Total internal Reflectance (D-ATR) Fourier Transform Infrared (FTIR) spectroscopy was evaluated as a soil NO(3)(-)sensor. Two independent datasets were tested; (1) the field dataset consisted of 124 GPS registered soil samples collected from four agricultural fields; and (2) the laboratory dataset consisted of five different soils spiked with various amounts of KNO3 (135 samples) and incubated in the laboratory. Spectra were collected using an Agilent 4100 Exoscan FTIR spectrometer equipped with a D-ATR cell and analyzed using partial least squares regression. Calibration R(2)values (D-ATR-FTIR predicted versus independently measured soil NO(3)(-)concentrations) for the field and laboratory datasets were 0.83 and 0.90 (RMSE=8.3 and 8.8mgkg(-1)), respectively; and robust leave one field/soil out cross validation tests yielded R-2 values for the field and laboratory datasets of 0.65 and 0.83 (RMSE=12.5 and 13.3mgkg(-1)), respectively. The study demonstrates the potential of using D-ATR-FTIR spectroscopy for rapid field-mobile determination of soil NO(3)(-)concentrations.