The development of RFID applications in agro-food has attracted
considerable research efforts in the last years. However,
some areas have been developed faster than others. For example,
there are several applications in livestock or cold chain monitoring
and just a few in farm machinery (see Tables 1 and 2). Fig. 1 and
Table 2 show the applications included in this paper, classified
by topic, power source and frequency. Both passive and active tags
are being used in Agriculture. Passive tags only give information
about identification and tracking, for sensing applications it is necessary
to use semi-passive or active tags.
Choosing the right frequency: Despite the fact that some of the
authors do not specify the frequency of the systems, we found
the higher amount of applications at LF (Low Frequency) and
UHF (Ultra High Frequency) bands. The LF band is used mostly
for implants in trees and animal identification systems, according
to the ISO 11784 and ISO11785 standards. UHF frequencies typically
offer better range and can transfer data faster than lowand
high-frequencies. But they use more power and are less likely
to pass through materials. The use of other frequencies than