Development of an instrument to monitor crop growth status

M. Li; D. Cui; X. Li; W. Yang

Development of an instrument to monitor crop growth status

In: Precision agriculture '09

Authors:

M. Li

M. Li Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China; limz@cau.edu.cn

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D. Cui

D. Cui Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China; limz@cau.edu.cn

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X. Li

X. Li Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China; limz@cau.edu.cn

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, and

W. Yang

W. Yang Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China; limz@cau.edu.cn

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Type:: Chapter

Pages:: 97–104

DOI:: https://doi.org/10.1163/9789086866649_012

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Abstract

Nitrogen content in crop leaf is an important indication for evaluating crop health and predicting crop yield. A normalized difference vegetation index (NDVI) is widely used as an indicator in estimating leaf nitrogen contents in practice. How to effectively and accurately measure NDVI value of crop leaves in the field is a challenge on in-field use instrument development. In order to detect the plant nitrogen content in real-time, a wireless crop growth monitor is developed. It is made up of a sensor and a controller. The sensor consists of an optical part and a circuit part. The optical part is made up of four optical channels and four photo-detectors. Two channels receive the sunlight and the other two receive the reflected light from the crop canopy. The intensity of sunlight and the reflected light is measured at the wavebands of 610 nm and 1220 nm respectively. The circuit part is made up of power supply unit, four amplifiers and a wireless module. The controller has functions such as keyboard input, LCD display, data storage, data upload and so on. Both hardware and software are introduced in this report. Calibration tests show that the optical part has a high accuracy and the wireless transmission also has a good performance.

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Precision agriculture '09

E-Book ISBN:: 9789086866649

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 2009

Subjects
- Life Sciences
  - General
  - Agriculture & Environment

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Development of an instrument to monitor crop growth status

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Precision agriculture '09

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