归一化植被指数测量仪的研制与应用

Development and Application of the Device for Measuring Normalized Difference Vegetation Index

合理施用氮肥是降低生产成本、提高作物增产的关键技术之一.文中提出了一种由4个专门设计的光电探测器直接得到归一化植被指数的测量方法,该参数能够反映作物的生长状态,知道不同季节的农作物对氮的需求量,对实施变量精准施肥具有重要的指导作用.理论上证明了,经过实验室标定的测量装置无须再作现场校正就可得到归一化植被指数.经国家农业信息化工程技术研究中心,颜色科学与工程国家专业实验室检测表明:该测量技术能准确反映植物的颜色特征,该测量装置可用以取代昂贵笨重的地物光谱仪直接获取被测目标的归一化植被指数值,与地物光谱仪测试结果偏离在5%以内.

Rational utilization of nitrogen fertilizer is one of the key factors to reduce production cost while improve the production of crops. The authors have developed a device for measuring the normalized difference vegetation index （NDVI） by using four specially designed photoelectric detectors; the NDVI can reflect the growing information and seasonal nitrogen fertilizer requirement of crops, and offers guidance for rational application of nitrogen fertilization. After calibration in laboratory, the measuring device needs no further correction. Experiments in National Engineering Research Center for Information Technology in Agriculture and National Laboratory of Color Science and Engineering indicate that the measurement technology can directly acquire NDVI, and that the measurement deviation is less than 5 % compared with that measured by using ASD FR2500.