Research And Development Of Portable Field Information Collection And Processing Terminal

Precision Agriculture (PA) is a trend of development of modern agricultural. PA is thesystem supported by information technology and implemented by a whole set of modernizedfarming operating technology and management based on localization, timing, rationing.Information acquisition occupies an important place in the variable status of a task inprecision agriculture, and the spectrum technology has become the focal point of worldwideattention in the course of information collecting currently due to its simple, fast, precision andno-damage merits and so on. This paper included several aspects below:(1) The wheat and corn blade are taken as research object, collects and processes leafblade’s spectral information by high spectrometer and studies the measuring principle and themethods to measure the chlorophyll.(2) According to the system overall scheme design, this paper takes AT89S52single chipmicrocomputer as the core, following the principle of double spectrum detection, conducts thedesign of portable chlorophyll acquisition system hardware module and realizes theequipment information collection, data processing, display, storage, and other functions. Theexperimental results have shown that the system runs stable and reliable.(3) Design system software according to the requirement of the system overall schemeand hardware system. Software is written based on the Kiel uvision4integrated developmentenvironment and compiled with C language. The system software is designed according todifferent models, which strengthens the flexibility of design and meets the designrequirements in different environments.(4) The leaf chlorophyll of wheat and corn are measured with the system which isdesigned in this paper. Test results show that, the prediction results have good correlation withthe standard measured data of SPAD-502, which can meet the requirement for plantchlorophyll measuring.The portable field information collection and processing terminal, based on chlorophyllnondestructive detection principle of double spectrum, uses normalized difference vegetationindex correction model, combines single chip microcomputer technology, spectrum detectiontechnology, photoelectric conversion technology, GPS technology, etc., realizes the rapid and nondestructive detection of field crop leaf chlorophyll, and this study has provided a platformto the real-time none-damage monitoring of crops’ nitrogen nutrition condition.