IEEE Geoscience and Remote Sensing Magazine - December 2021 - 212
of water resources reflected in irrigation systems and toward
increasing of production and efficiency of crops through the
automation and optimization of processes. These two practices
correspond to 26.7 and 36.1% of the projects, respectively.
On a smaller scale, the objectives of the technical evaluation
of network performance and development of inclusive
technologies, whether low cost or user friendly, represent
20.9 and 10.5%, respectively. Platforms aimed at improving
the final quality of products and reducing the vulnerability
of crops to climate change account for 4.7% each, and pest
treatment accounts for 2.3%.
The results can be grouped into four areas. First is the improvement
of crop yields, which includes production optimization
and the automation of water management and pest
treatment, representing 65.1%. Second is the evaluation of
the proposals and/or how to make them affordable, both of
which focus on generalizing the use of WSNs; in this case,
they represent 31.4%. In third and fourth place are final
product quality and climate change vulnerability reduction,
both cases with 4.7%.
40
20
10.5%
4.7%
2.3%
Water Management/Irrigation
Production Optimization
Performance Technical Evaluation
Inclusive Technology/Affordable Solutions
Final Product Quality
Climate Change Vulnerability Reduction
Pest Treatment
FIGURE 2. The main applications of WSN in agriculture.
Analyzed Variables
77.91
72.09
16.28
0102030405060708090
Documents (%)
Plant
Environment
Soil
FIGURE 3. The percentage representation of analyzed variables
within the documentary sample.
212
WSN Applications in Agriculture
36.1%
26.7%
20.9%
From the Figure 2 background data, three major aspects
are deduced. First, a solution for optimization in agriculture
is needed. Using WSNs, farmers can reduce operational
costs and/or improve productivity to obtain higher incomes.
Additionally, the environmental impact is reduced
with this optimization as a result of improved awareness of
greener production (environment friendly, organic, and so
forth) and the completion of different required regulations
(for example, the reduction of pesticides in pest control).
As a result of this enhanced leverage, farmers get a betterquality
crop. The second aspect is the limited resource of
water. Its constraint is exacerbated by climate change, and
it is estimated that about 70% of freshwater will be consumed
by 2050 [128]. However, it is in great demand in agriculture
for different kinds of irrigation, from flooding to
dripping; this has led to conflicts in establishing fair usage
among different consumers. The application of WSNs optimizes
water management and enables a more equitable
distribution. Third, WSN solutions must be tested and validated
to demonstrate their feasibility. Working with WSNs
has many advantages over other technologies: low cost,
adaptability, an easy learning curve, inclusive technology
with open and proprietary solutions, a good cost-benefit
relation, and the possibility of nondestructive tests of the
technology in crops. All of this makes many preliminary
studies possible, as the number of articles shows.
To make the right agronomical decisions possible, WSN
applications need to monitor various parameters. From the
analyzed works, a variable classification was made based on
where data were acquired: in " plant, " " environment, " and
" soil. " Figure 3 shows that soil stands out most frequently,
with 77.91%, followed closely by the environment (72.09%)
and, lastly, in a much smaller value, by the characteristics of
the plant or fruit, corresponding to 16.28% of the total investigations
from the documentary sample. Normally, different
parameters were monitored simultaneously. Also, sometimes,
the same parameter was measured for distinct variables, for
example, humidity in the soil and environment. Monitoring
plants is more difficult since, as living entities, they grow
based on each of their own characteristics-height, foliage,
thickness, and so on-resulting in the need to relocate sensors
to correct measurement and function. In our experience, the
direct monitoring of plants entailed some problems in relation
to that specific issue; sensors lost the line of sight, which
reduced the effective range of transmission and, in the worst
case, resulted in losing all connectivity or part of the data. In
some situations, increasing the power of transmission, with
the handicap of more power consumption, may mitigate
these disruptions. It is sufficient to effectively assess the condition
of crops; most scientific documents rule out the direct
surveillance of plants. For instance, water/irrigation management
can be monitored with a high degree of accuracy using
two variables: soil moisture and ambient humidity. These parameters
are specific and are present in many investigations.
For each acquisition location, further analysis is performed,
identifying individual monitored variables. Figure 4
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE DECEMBER 2021
Documents (%)
IEEE Geoscience and Remote Sensing Magazine - December 2021
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