Nanotechnology for Precision Agriculture: History
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Anurag Yadav
,
Kusum Yadav
,
Rumana Ahmad
,
Kamel Abd-Elsalam

By adopting nanotechnology-based precision agricultural practices, the farming community can reduce agrochemicals while maintaining high crop productivity, protecting soil and water health, and contributing to a cleaner environment.

  • nanotechnology
  • precision agriculture
  • nanobiosensors
  • nanofertilizers
  • agro-waste reduction

1. Nanobiosensors in Diagnostics and Precision Agriculture

The unprecedented increase in the use of agrochemicals and fertilizers has led to an accumulation of nutrients and toxins in ground and surface waters. These toxic concentrations are responsible for higher costs of water purification, reduced fisheries, and decreased recreational activities [1]. Conventional agricultural practices are deteriorating soil quality and are responsible for the eutrophication of water bodies. In addition, bad farming practices damage the ecosystems of beneficial insects and other wild organisms and, therefore, must be replaced by precision agricultural methods.
Precision agriculture includes wireless field networking and nanosensors for observing and controlling farming practices. It manages site-specific crops and pre- and post-harvesting aspects [2]. Under precision agriculture, exploring the fascinating properties of functional materials from which nanobiosensors are built could help accurately analyze soil humidity, water, nutrients, and phytopathogens [3] (Figure 1). Biosensors are now available for detecting odors in food spoilage, and such sensors [4] are called “electronic noses”, followed by the development of other sensor types. The electronic nose uses an array of gas sensors to identify various kinds of odors. The gas sensors are composed of NPs like ZnO nanowires [5] and nanorods [6], which could detect impurities in vapor mixtures [7]. Such sensors work on the principle of change in their resistance with the passage of different gases resulting in variation in the generated electrical signals, which are used as a fingerprint for gas detection. A typical biosensor consists of four units: (1) a sensor, (2) a signal conditioning block, (3) a microprocessor chip, and (4) a radio module for wireless communications between the sensor and the monitoring station [8].
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Figure 1. Functional representation of nanosensors in precision agriculture.
Recent nanotechnological leaps have enabled us to study biochemical interactions in plant cells and tissues due to various pathogens. The method uses a probe inserted in the xylem vessel at the root base. The probe measures xylem pressure, radial electrical gradients, and ionic activity [9][10]. Such tools help better understand pathogenicity mechanisms to improve crop disease treatment strategies [11][12]. However, the previous approach relied on the destructive sampling of pathogenic bacteria colonizing the xylem, which failed to provide helpful information about colorization patterns, biofilm development, movement, and re-colonization of bacterial pathogens in new tissues. However, implementing microfabricated xylem vessels containing nano-sized features lets us understand the features that were impossible with conventional methods [13].

1.1. Monitoring of Soil Quality Parameters

Biomonitoring is a technique used to collect and analyze organisms, tissues, or fluids to determine their exposure to natural and synthetic chemicals. The information gleaned from these observations is valuable, as it provides insight into the number of chemicals that have entered the organism and led to corresponding changes. Biomonitoring is also an effective method for estimating the total dose absorbed by the organism, which can provide indirect access to monitor target site concentrations. The advancement of sensor technology has improved its sensitivity and reduced its size compared to conventional biosensors. Such biosensors are used to monitor fertilizers, herbicides, pesticides, insecticides, pathogens, soil moisture, and pH [14]. An ideal nanobiosensor should be stable over long storage periods and possess a lower reaction time. In addition, it should be small, biocompatible, non-toxic, non-antigenic, inexpensive, portable, accurate, and capable of producing repeatable findings [15]. Nanobiosensors are ultrasensitive devices and can detect viruses at ultra-low concentrations as they operate at the atomic scale with the highest efficiency and accuracy.

1.2. Monitoring Soil Pesticides/Herbicides

The insects are cosmopolitan in distribution and hold the highest population among pests. They infest all plants and products by injuring their parts or attack storage products to incur heavy crop losses. The regular use of pesticides in fields to combat pests can lead to the development of resistance among pest groups [16]. Additionally, pesticide chemicals degrade in the environment over time, which reduces their effectiveness for agricultural use. NM use in pesticide formulations could aid in reducing usage and attaining agricultural sustainability. NM includes C nanotubes, quantum dots, gold NPs, carbon black, and nanocomposites. Many nanostructured biosensors have been developed for pesticide detection in water and food [17]. Based on consumption rates, toxicological information, and environmental residual levels, the U.S. Environmental Protection Agency (EPA) proposed a limit of 0.9 mg/L glyphosate in drinking water and an acceptable daily intake of 0.3 mg/kg/day [18].

1.3. Monitoring Soil Nutrients

Nanosensors are being developed as a promising real-time technology for monitoring soil nutrients. These sensors detect and quantify nutrients such as nitrogen, phosphorus, and potassium in soil samples. They use nanomaterials, such as carbon nanotubes, graphene, and nanoclays, to detect and bind with specific nutrients in the soil [19]. Nanosensors can provide farmers with accurate and timely information about soil nutrient levels, which can help them make more informed decisions about fertilizer application and crop management. This technology can assist in decreasing fertilizer waste, boost fertilizer efficiency, and lessen the potentially negative environmental implications of typical fertilizer application methods. One example of a nanosensor for soil nutrient monitoring is a graphene-based sensor that can detect nitrogen levels in soil [20]. The sensor is designed to be integrated into a wireless sensor network that can provide real-time data on soil nutrient levels to farmers.

1.4. Monitoring Soil Humidity

To ensure successful crop production, it is necessary to regularly analyze soil texture and moisture content. Relative humidity measurements determine the amount of water vapor in a gas mixture at a specified temperature. Standard-level deviations in soil moisture can significantly impact agricultural yields since these parameters vary spatially and temporally. Although conventional methods are available for estimating soil moisture levels, their accuracy is often low. Such methods require frequent calibration, reducing their stability and making them less preferable for use in agricultural settings.
Humidity-based nanosensors are increasingly replacing conventional methods for measuring soil moisture [21]. These sensors utilize electrical transduction with a hygroscopic probe, which changes its dielectric properties upon water absorption. Nanosensors fabricated from polymers, ceramics, and composites provide several benefits, such as increased stability, prolonged chemical and thermal durability, and enhanced environmental adaptability [22]. The widespread use of nanosensors in agriculture could significantly improve the precision of soil temperature and moisture measurements. Many of these devices are equipped with wireless communications systems that are economical, user-friendly, and can provide real-time data. Examples of nanosensors commonly used for soil measurements include carbon nanotube and graphene-based nanosensors [23]. For instance, a graphene oxide-based sensor is a type of humidity-based nanosensor that can detect changes in humidity levels from 0.1% to 90% [24].

1.5. Monitoring Plant Disease and Stress

Plant stress and nutrient deficiency are detected by monitoring plant physiology through imaging, spectroscopy, and fluorescence [25][26]. The described remote sensing methods provide vital information about leaf area, chlorophyll content, stomatal conductance [27], transpiration rate [28], water potential [29], and leaf temperature [30]. However, the methods are not helpful for the early diagnosis of plant stress and nutrient deficiency and are not economical for installation in individual plants [25]. NPs-based sensors are now being utilized to monitor plant disease and stress by providing an early detection system for plants. These systems measure the volatile organic compounds (VOCs) released by plants during biotic and abiotic stress or disease conditions. Nanoparticle based sensors can detect these VOCs by analyzing their physical and chemical properties, allowing for the identification of the specific stress or disease affecting the plant.
One example of a nanoparticle-based system for plant disease detection is a gold nanoparticle-based sensor that can detect the presence of bacterial pathogens in plants [31]. The sensor works by detecting the VOCs released by the bacteria, allowing for early detection of the disease before visible symptoms appear. Similarly, NPs have been used to monitor abiotic stress in plants, such as drought stress, by detecting changes in VOC emissions. Carbon nanotubes have been utilized in a sensor that can detect changes in VOCs associated with drought stress in plants [32][33]. The sensor can detect VOCs with high sensitivity and specificity, allowing for early detection of drought stress in plants.

1.6. Monitoring Irrigation

Due to the uncertainties posed by climate change, land water availability has reduced globally, and droughts and erratic monsoon patterns are becoming more frequent [34]. The current decade is facing a challenge in getting clean and needed water for human use, industrial purposes, and agriculture. The escalating use of agrochemicals in agriculture has exacerbated groundwater pollution. Our water resources are getting contaminated with microbial pathogens, salts, metals, agrochemicals, pharmaceutical compounds, personal care products, and radioactive elements [8]. A specific type of contaminant in water bodies is primarily due to anthropogenic activities like oil and gas production, mining, or natural processes like leaching [35], which require thorough treatment procedures for water recycling. Water treatment requires novel and sustainable technologies for recycling purposes.
Precision and site-specific irrigation management have emerged as potential solutions to enhance crop productivity under adverse climate change conditions [36]. The concept has appeared as a possible solution for improved crop productivity under adverse climate change. The method uses advanced technologies such as GPS, GIS, and automated machine guidance to apply water judiciously. This approach can be complemented with low-flying drones or sensitive satellites with high-resolution imaging capabilities to determine the water content of soil or plants and induce precise irrigation at the site of need. As a result, water consumption for irrigation can be reduced. However, several bottlenecks, such as cloud interference and high data processing requirements, still need to be addressed. Integration of crop simulation models with remote sensing technology enhances the efficacy of agricultural management and decision-making processes. The application of nanotechnology to microirrigation can enhance water quality and filtering techniques. Nanoparticle-based biosensors can detect and measure water-based contaminants in real-time and remove them using nanofiltration membranes [37]. Nanoparticle-based membranes can also desalinate water, reducing the likelihood of clogging on the filters and membranes.

1.7. Summary of Biosensors in Precision Agriculture

The section discussed the role of nanobiosensors in diagnostics and precision agriculture. These sensors monitor soil parameters such as quality, pesticide/herbicide levels, nutrient content, and humidity. They also play a crucial role in monitoring plant disease and stress and managing irrigation. The summary of biosensors’ application in precision agriculture is also mentioned, highlighting their importance in achieving more efficient and sustainable farming practices (Table 1).
Table 1. Nanobiosensors in diagnostics and precision agriculture.
Type of Biosensors Function Material Type Reference
Environmental biosensors, chemiresistor sensors monitoring of soil quality parameters polymers, metal oxides [38]
Pesticide biosensors, electrochemical biosensors monitoring soil pesticides/herbicides enzymes, conducting polymers [39][40]
Nutrient biosensors, potentiometric biosensors monitoring soil nutrients ion-selective electrodes, polymers [41][42]
Moisture sensors, capacitive humidity sensors monitoring soil humidity ceramics, polymers [43][44]
Plant disease biosensors, fluorescence-based biosensors monitoring plant disease and stress quantum dots, fluorescent proteins [45][46]
Irrigation biosensors, soil moisture sensors monitoring irrigation ceramics, metal oxides [47][48]

2. Nanotechnological Applications to Reduce Agro-Waste and for Synthesizing High-Value Products

Agricultural residues are produced from harvesting and processing crops, fruits, vegetables, and trees in bulk during agricultural practices. Agro-waste mainly includes plant parts unusable for human consumption, including stems, leaves, shells, bark, seeds, pods, husks, etc. [49]. Agricultural waste is rich in lignocellulosic materials and could be exploited for economic and environmental benefits to produce organic acids, biofuels, protein-rich animal feed, microbe-based pigments, mushrooms, and enzymes [50][51]. Despite the large volume of agro-waste generated worldwide, only a small fraction is recycled. The majority is burned or used as animal feed [52].
Nevertheless, the issue of agro-waste burning is linked to environmental pollution and is restricted in several countries or provinces [53]. Agro-waste can be dealt innovatively through composting, producing bioactive compounds, nanomaterials, and biorefinery tools [54]. In addition, NPs can be used to encapsulate nutrients and other bioactive compounds, protecting them from degradation and increasing their bioavailability [55]. This technology can reduce the amount of agro-waste by allowing farmers to use fewer inputs while increasing the efficacy of their crops.

3. Tagging, Monitoring, and Tracking the Agroproducts Using Nanotechnology Methods and Devices

The wide variety and large volume of generated agroproducts need efficient tagging. Previously, laser-scannable barcodes with the Universal Product Code (UPC) were used for tagging agro-products [56]. They have been replaced in several countries by radio-frequency identification (RFID) tags, which consist of a wireless integrated radio circuit and an embedded identification code [57]. RFID provides several advantages over its predecessor, like more information storage at a sizeable scannable distance with simultaneous scanning of products [57]. RFID tags are also used in food packaging for tagging and tallying customer purchases.
A newer “nanobarcode” method that functions like UPC on nano-scalar levels has been introduced. Nanoplex technology-based nanoparticle-containing strips are used for encoding information. Nanoplex labels the device using platinum, palladium, nickel, and cobalt [58]. The nanoplex technology has developed “Sensor” tags (Silicon Enhanced NPs for surface-enhanced Raman Scattering), a 50 nm metal nanoparticle with unique codes that can be read from a meter length. Nanotags can be used to track agroproducts from farm to consumer. They can be incorporated into the packaging to track the temperature, humidity, and other environmental conditions during shipping and storage [59].
These nanotechnology-based tracking methods offer a range of benefits for the agriculture industry. By using nanotechnology to tag, monitor, and track agroproducts, farmers and food manufacturers can ensure the quality and safety of their products, reduce waste by identifying issues early, improve efficiency by tracking products through the supply chain, increase transparency, and build trust with consumers by providing information about the origin and safety of their products. PA practices have been adopted in the vineyards of Nakhon Ratchasima [60]. Similar kinds of methods are also adopted in Thailand [60], the USA [61], and Brazil [62].

4. Smartphone-Based Biosensors in Precision Agriculture

Traditional biosensing equipment are cumbersome, costly, and require cautious handling, which limits their utility in agricultural regions. Recent advances in lab-on-a-chip (LOC) technology have resulted in the miniaturization of standard biosensing devices [63]. When connected with smartphones, these devices have the potential to transform the process of agricultural data collection (Figure 2). Smartphones have great promise in smart farming due to their portability, affordability, and ease of access, particularly in rural areas. Smartphones are transforming our daily information consumption habits. The use of smartphones in agriculture as detectors or instrument interfaces has the potential to revolutionize how we obtain information. Furthermore, they possess considerable processing power to support agriculture-based applications and can be equipped with sensors for smart farming. These biosensors use the camera and other sensors on a smartphone to analyze data collected from plants, soil, and other agricultural samples, allowing farmers to make data-driven decisions about their crops. Among the primary benefits of smartphone-based biosensors are their affordability and portability. Moreover, they are readily accessible to farmers in developed and developing countries, allowing for widespread adoption and use. Additionally, they can be easily integrated with other PA technologies, such as unmanned aerial vehicles and remote sensing, to provide a more comprehensive approach to crop monitoring and management.
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Figure 2. Smartphone based nanosensors in precision agriculture.
Nanosensors incorporated into smartphones can aid in early disease detection, fertilizer dosage calculations, and monitoring water supply to estimate crop maturity and yield [64]. Nanosensors can also detect soil nutrients and water stress. For example, they can analyze soil samples for nutrient content and provide recommendations for fertilization. They can also detect plant stress by measuring chlorophyll content, which can help farmers adjust their irrigation and nutrient management practices to improve crop health and yields. After gathering data from numerous phone sensors, the intelligent network system may transfer it elsewhere for in-depth analysis [63]. In a recent study, Surface-Enhanced Raman Scattering (SERS) chip-based nanosensors were utilized to quantify pesticide residue using a click-through mobile phone application. These nanosensors effectively identified 12 types of pesticides at concentrations as low as ten ppm [65]. Such advancements enable the identification of substances and metabolites on-site. Despite the challenges associated with their use, the benefits of smartphone-based biosensors are significant and can potentially revolutionize PA.

5. Precision Agriculture and Cloud Computing

Current research focuses on innovative techniques for boosting agricultural output with minimal environmental impact. Recent technological developments like cloud computing and green nanotechnology offer viable alternatives for more inventive and sustainable agriculture. In combination with technologies like the Internet of Things (IoT), cloud computing is transforming food supply chains through automation, precision agriculture, remote monitoring, forecasting, and decision-making. Cloud computing could aid in applying agrochemicals to cultivate improved crops. Precise agricultural procedures can enhance crop profitability and agricultural input [66].
Cloud-based computing stores centralized agriculture-related data, including soil parameters, weather, crop, fertilizer, input, agriculture marketing, etc., in the cloud. Cloud computing, a revolutionary technology for future computing and communication, involves interconnected devices sharing digital data with markets, social networks, knowledge base platforms, and crop protection agencies. The operation of these networks is based on remote sensing, geographic information systems (GIS), global positioning systems (GPS), sensor technology, RFID, and cloud computing. In IoT, agricultural farms and machinery continuously remain integrated with sensors, the internet, and database systems. IoT includes soil and plant monitoring, greenhouse environment monitoring, and food supply chain monitoring (Figure 3).
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Figure 3. Application of plant based nanosensors in precision agriculture.
The chief advantage of cloud computing is that it is data-ready, allows local to global level communication, and reduces technical issues. Cloud computing is poised to improve agricultural growth and provide food security and safety, thus contributing to the GDP growth of nations with agriculture-centric economies.

This entry is adapted from the peer-reviewed paper 10.3390/agrochemicals2020016

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