Advancements and challenges in sustainable agriculture: A comprehensive review

Introduction

Agriculture is crucial for fulfilling the needs or demands of increasing population especially related to food. But there are many problems that scare us whether the agriculture will able to provide food for future, because of problems like soil crusting and compaction, fertility imbalance, salinization and alkalization, acidification, toxicity accumulation, desertification and climate change. Increasing population and demand for food causes the degradation of land and water resources (Spiertz, 2009) [39] . However, because of the natural resources (land, soil, water) have been depleting, so in order to overcome these problems the concept related to sustainable agriculture was introduced. The population is rising day by day (Velten et al., 2015) [44] . As a conclusion world's population will be 9 billion during 2050, so, the need for food surges in tandem, placing unprecedented strains on agriculture system (Godfray et al., 2010) [12] . The aim or goal of sustainability is meeting or fulfilling the needs of present generation without compromising the needs of the future generation (Spiertz, 2009) [39] . Sustainable agriculture is type of agriculture which fulfil the demands of present generation and also focus on the demands of future generation to meet their needs. This type of agriculture mostly achieves a balance among the need for food production and preservation of ecological system in the environment. The major goal of this is to reduce the use of chemicals, promote biodiversity and enhance soil health. Sustainable agriculture is a deeply rooted in indigenous and traditional farming practices, has evolved a response to the environmental and social concerns associated with industrialized agriculture (Altieri, 2017) [1] . Visionaries such as Sir Albert Howard, Rachel Carson and Wendell Berry pioneered holistic approaches to farming, emphasizing principal of soil health, biodiversity conservation and long -term sustainability. This paradigm shift towards sustainable agriculture has gained traction due to the recognition of negative externalities linked to conventional farming, including soil erosion, water pollution, biodiversity loss and rural impoverishment. By integrating traditional knowledge systems with scientific innovations, sustainable agriculture seeks to balance agricultural productivity with environmental conservation and socio-economic equity. It represents transformative approach to farming that prioritizes the conservation and enhancement of natural resources while promoting resilience and adaptability to environmental stressors (Tilman et al., 2011) [41] .

Advancements

Agroecology: Recent research has showed that the agroecology enhances crop yield, minimize environmental impacts and improve livelihoods for smallholder farmers (Altieri, 2017) [1] . Diversified cropping systems is a cornerstone of agroecological practices that enhance soil health, increase biodiversity and minimizes pest and disease pressure (Altieri, 2017) [1] . Integrated Pest Management (IPM) strategies is another advancement in agroecology that minimize the use of pesticides while maintaining effective pest control through methods such as crop rotation and biological control (Pretty & Bharucha, 2014) [31] . Also, conservation agriculture includes methods like less soil disturbance and permanent covering the soil (crop residue), contribute to soil conservation, water holding capacity and carbon sequestration, thereby enhancing the adaptation of agricultural systems to environmental stresses (Hobbs et al., 2008) [16] . These advancements tell the importance of agroecology in promoting sustainable agriculture by ecological resilience, improving resource use efficiency and enhancing the overall sustainability of food production systems. Organic Farming: Organic farming practices include the use of synthetic inputs such as pesticides and fertilizers and relying on natural methods of pest control. Studies have shown that organic farming conserve soil and biodiversity and improve water quality. (Reganold & Wachter, 2016) [35,36] . Organic farming is best option for sustainable agricultural production without affecting the environment (Pugliese, 2001) [32] . It is defined as an environment and social sustainable method of agriculture where there is no use for synthetic chemicals like fertilizers or pesticides (Lampkin et al., 1999) [20] . Overall, organic farming causes sustainable food production and ecological balance. Precision Agriculture: Recent advancements in precision agriculture have led to more efficient nutrient management, reduced pesticide use, and increased farm profitability (Sui & Li, 2017) [17] . It involves the use of inputs in precise manner such as water, fertilizers and pesticides according to real-time data and site-specific conditions (Basso & Antle, 2021) [2] . One key aspect of precision farming is this there is use of technologies such as Global Positioning Systems, Geographic Information Systems, and remote sensing (McBratney et al., 2014) [23] . These technologies enable farmers to collect data on soil characteristics, crop health, and environmental conditions with high accuracy and resolution (Liu et al., 2020) [46] . Due to precision agriculture, there is adoption of site-specific management practices for the needs of field or crop (Pannell & Llewellyn, 2014) [28] . Variable rate application systems enable farmers to adjust input levels based on spatial variability in properties of soil, crop growth stages and yield potential (Montagu et al., 2011) [26] . Furthermore, precision farming facilitates the conservation practices such as minimum tillage and controlled traffic farming, which help preserve soil structure, reduce erosion, and enhance carbon sequestration (Rezaei et al., 2020) [37] . Conservation Agriculture: From research, it has been found that conservation agriculture can reduce erosion by soil, improve water holding capacity and enhance crop resistance to climate change (Hobbs et al., 2008) [16] . Covering soil by using crop residues or cover crops reduces soil erosion, conserve soil moisture, moderates soil temperature and reduces weed infestation which enhances soil health and productivity. Growing different crops not only improves soil structure but also reduces nutrient loss through leaching and increases biodiversity, due to this there is more sustainable agricultural systems (Pittelkow et al., 2015) [29] . Overall, conservation agriculture is an important practice for sustainable farming and promote long-term agricultural viability and sustainability.

Challenges

Policy Barriers: Policy barriers like conventional farming practices have many subsidies, improper or lack of credit and markets decreases adoption of sustainable agriculture (Pretty & Bharucha, 2014) [31] . Lack of subsidies create financial problems for farmers to convert to sustainable agriculture, so there is continuous dependance on conventional farming (Montgomery, 2017) [27] . Water rights, pesticide usage instructions and certification standards are not with sustainable farming principles which obstructs the implementation of sustainable agriculture for farmers. Moreover, poor infrastructure, including improper transportation and storage facilities due to these challenges, the adoption of sustainable practices in regions mostly lack essential resources. Overall, policy barriers is major challenge for adoption of sustainable agriculture and achieving long-term environmental and economic benefits. Financial Incentives: The transition period to sustainable agriculture requires investments in infrastructure, training, and technology, which may pose financial barriers for smallholder farmers and resource-constrained communities (Mittal, 2018) [24] . Without adequate financial support or incentives, farmers may find it economically unfeasible to make this shift, particularly small-scale farmers with limited resources (Pretty & Bharucha, 2014) [31] . This volatility may discourage investment in sustainable practices, especially among those reliant on niche markets (Hinrichs & Lyson, 2007) [15] . Small-scale and resourceconstrained farmers often face challenges in obtaining loans or credit facilities to finance investments in sustainable practices, hindering their ability to adopt environmentally friendly methods (Coleman-Jensen et al., 2014) [3] . Addressing these challenges and providing robust financial incentives is necessary to promote adoption of sustainable agriculture and support the transition towards more resilient and environmentally sustainable food systems. Knowledge Gaps: Knowledge gaps through interdisciplinary research is essential for sustainable agriculture (Gliessman, 2015) [11] . Mostly due to the lack of technical skills and training causes the knowledge gap. Adopting sustainable practices often requires knowledge and experts' advice but many farmers lack the necessary training in areas for adopting agroforestry, precision farming and soil conservation. Lack of scientific studies, field trials and proper data obstructs the understanding of the ability, feasibility and economic viability of sustainable agriculture practices and reduces the adoption of sustainable agriculture (Tittonell & Giller, 2013) [42] . The knowledge gap can be improved through proper information and research is essential for promoting sustainable agriculture and building sustainable food systems which is capable of meeting the challenges for future.

Future Directions

Policy Support: Policymakers should help in promoting sustainable agriculture through the supportive policies, incentives, and regulations that prioritize environmental sustainability, food security, and rural development (FAO, 2020) [7] . By incentivizing sustainable methods through financial incentives, subsidies, and tax breaks, policymakers can steer farmers towards practices that enhance soil health, biodiversity, and ecosystem resilience (De Schutter, 2010) [4] . Additionally, robust regulatory frameworks can ensure that agricultural activities adhere to standards for pesticide use, water management, and soil conservation, thus minimizing negative environmental impacts (Torhonen et al., 2019) [43] . By investing in research and extension services, policymakers empower farmers with the tools and information needed to adapt to changing environmental conditions and improve productivity sustainably. Furthermore, capacity building and education programs can equip farmers with the knowledge and skills to implement sustainable practices effectively, driving a widespread shift towards more resilient and environmentally friendly agricultural systems (Lipper et al., 2014) [22] . Innovation and Technology: Continued investment in research and growth of innovative technologies and practices is essential for overcoming challenges and unlocking the full potential of sustainable agriculture (Tilman et al., 2011) [41] . Climate-smart agriculture benefits from innovative technologies such as drought-tolerant crops, weather forecasting models, and agroforestry systems, bolstering resilience and adaptation to changing climatic conditions (Lipper et al., 2014) [22] . Vertical farming and controlled environment agriculture (CEA) exemplify cutting-edge approaches to food production, leveraging hydroponics, aeroponics, and LED lighting to cultivate crops indoors, conserving land, water, and energy while supplying fresh produce to urban centers (Graamans et al., 2018) [13] . The advent of digital agriculture, marked by the integration of digital technologies, data analytics, and AI, revolutionizes farm management by providing real-time insights into health of crop, condition of soil, allow data-driven decisionmaking for optimized resource management (Liu et al., 2020) [46] . Additionally, biotechnological innovations like genetic engineering and genome editing, help in developing crop varieties with features like pest resistance and drought tolerance, fostering increased productivity and reduced reliance on chemical inputs (Kumar et al., 2018) [19] . Capacity Building: Building the capacity of farmers, extension agents, and other stakeholders through education, training, and extension services is critical for scaling up sustainable agriculture practices and ensuring their long-term viability (Jose, 2009) [18] . This knowledge equips them to adopt practices that not only bolster soil health, biodiversity and ecosystem resilience whereas also enhance the sustainability of agricultural systems for long term (Hagmann et al., 2012) [14] . Furthermore, capacity building fosters the adoption of innovative agricultural technologies by providing technical training and support, enabling farmers to leverage precision agriculture tools and digital technologies, (Qaim & Kouser, 2013) [33] . By strengthening community resilience and promoting social cohesion, capacity building initiatives foster sustainable agricultural practices that are firmly rooted in local contexts. Additionally, capacity building plays a crucial role in advocacy and policy engagement, equipping farmers and civil society organizations with the skills to advocate for supportive regulatory frameworks and policies that incentivize sustainable agricultural practices and investments (Mkumbwa et al., 2018) [25] .

Case studies 1. Agroforestry in Kenya (Africa)

According to Franzel et al., (2007) [9] , Agroforestry includes growing of trees or shrubs along with crop or livestock and it has been proved that the agroforestry is highly favorable for Kenya. These practices enhance fertility of soil, increase biodiversity and also use as a sourced of income through sale of fruit, timber and fodder.

Impacts

Soil fertility: Trees help in fixing nitrogen which increases soil fertility and reduce the dependance on external fertilizers.

Biodiversity: Increased biodiversity helps in pest control and pollination which lead to healthier crop systems. Economic benefits: Farmers have more diversified income sources which reduces their economic risk and Increasing resilience to market fluctuations.

Precision Agriculture in Lowa (United States)

According to Schimmelpfenning (2016) [38] , in Precision agriculture, there are technologies such as GPS, drones and IoT sensors to manage crop more effectively. In Lowa, by adopting precision farming, there is significant improvement in resource use efficiency and increased in crop yield.

Impacts

Resource efficiency: Precise application of water, fertilizers and pesticides reduces environmental contamination.

Yield Increases: Regular monitoring and management lead to increase in crop yield and better-quality produce.

Organic farming in Germany

According to Willer and Lernoud (2019) [45] , Germany is known for organic farming within Europe, having an extensive policy for supporting organic agriculture and more demand of consumer for organic products. The government in Germany also helps in providing subsidies and technical assistance to farmers transitioning to organic practices.

Impacts

Environmental benefits: Organic farming reduces the need or use of chemicals and promote healthier ecosystem.

Market growth: Stronger demand for organic products causes the growth of market and profitability for organic farmers.

Policy support: Government policies and subsidies also support farmers during transition period thus ensuring economic viability.

Conclusion

Sustainable agriculture has a promising pathway for a more resilient, equitable, and sustainable food system. By principles of agroecology, organic farming, precision agriculture and conservation agriculture, sustainable agriculture holds immense potential to address the challenges which global food systems face. However, realizing this potential requires concerted efforts from policymakers, researchers, practitioners and communities to overcome existing problems and promote the use of practices related to sustainability worldwide.

References

1. Altieri MA. Agroecology: The Bold Future of Farming in Africa. Agroecology and Sustainable Food Systems. 2017;41(3-4):315-323.
2. Basso B, Antle J. The value of precision agriculture for sustainability: A global meta-analysis. Science Advances. 2021;7(6)
3. Coleman-Jensen A, Gregory C, Singh A. Household food security in the United States in 2013. USDA-ERS Economic Research Report. 2014;(173).
4. Derpsch R, Friedrich T, Kassam A, Li H. Current status of adoption of no-till farming in the world and some of its main benefits. International Journal of Agricultural and Biological Engineering. 2010;3(1):1-25.
5. Food and Agriculture Organization of the United Nations (FAO). The Future of Food and Agriculture: Alternative Pathways to 2050. FAO; c2019.
6. Francis C, Lieblein G, Gliessman S, Breland TA, Creamer N, Harwood R, et al. Agroecology: The ecology of food systems. Journal of Sustainable Agriculture. 2003;22(3):99118.
7. Franzel S, Wambugu C. The uptake of agroforestry in Africa: The case of Kenya. Agroforestry Systems. 2007;69(1):37-44.
8. Giller KE, Witter E, Corbeels M, Tittonell P. Conservation agriculture and smallholder farming in Africa: the heretics' view. Field Crops Research. 2009;114(1):23-34.
9. Godfray HCJ, Beddington JR, Crute IR, Haddad L, Lawrence D, Muir JF, et al. Food security: the challenge of feeding 9 billion people. Science. 2010;327(5967):812-818.
10. Graamans L, Kromdijk J, Van Den Boogaard R, De Visser PH, Van Kooten O, Van Den Dobbelsteen A, et al. Opportunities for Improving Urban Food Supply: The Role of Controlled Environment Agriculture. Environmental Research Letters. 2018;13(6):063001.
11. Hagmann J, Chuma E, Murwira K, Connolly M. Capacity development for agricultural biotechnology in developing countries: An approach to an integrated evaluation. Research Evaluation. 2012;21(2):89-102.
12. Hobbs PR, Sayre K, Gupta R. The Role of Conservation Agriculture in Sustainable Agriculture. Philosophical Transactions of the Royal Society B: Biological Sciences. 2008;363(1491):543-555.
13. Johansson JF, Paul LR, Finlay RD. Microbial interactions in the mycorrhizosphere and their significance for sustainable agriculture. FEMS Microbiology Ecology. 2004;48(1):1-13.
14. Jose S. Agroforestry for Ecosystem Services and Environmental Benefits: An Overview. Agroforestry Systems. 2009;76(1):1-10.
15. Kumar A, Verma JP, Singh SK. Review: Application of omics technologies in sustainable agriculture. International Journal of Life Sciences. 2018;6(2):251-260.
16. Leach M, Rockström J, Raskin P, Scoones I, Stirling AC, Smith A, et al. Transforming innovation for sustainability. Ecology and Society. 2012;17(2).
17. Lipper L, Thornton P, Campbell BM, Baedeker T, Braimoh A, Bwalya M, et al. Climate-smart agriculture for food security. Nature Climate Change. 2014;4(12):1068-1072.
18. McBratney A, Field DJ, Koch A. The dimensions of soil security. Geoderma. 2014;213:203-213.
19. Mkumbwa S, Mudhara M, Wale E. Capacity development for community-driven development approaches: Experiences and lessons from South Africa. Development Southern Africa. 2018;35(3):324-340.
20. Montagu KD, Naidu R, Smith E, Hardwick K. Field-scale variability of soil properties and wheat yield in response to deep ripping. Soil and Tillage Research. 2011;111(1):95105.
21. Pannell DJ, Llewellyn RS. Corrigendum to "and heterogeneity of crop yield responses to fertilizer, herbicide and seed chemical". Agricultural Systems. 2014;129:124.
22. Pittelkow CM, Liang X, Linquist BA, Van Groenigen KJ, Lee J, Lundy ME, et al. Productivity limits and potentials of the principles of conservation agriculture. Nature. 2015;517(7534):365-368.
23. Pretty J. Can sustainable agriculture feed Africa? New evidence on progress, processes and impacts. Environment, Development and Sustainability. 1999;1:253-274.
24. Pretty J, Bharucha ZP. Sustainable intensification in agricultural systems. Annals of Botany. 2014;114(8):15711596.
25. Pugliese P. Organic farming and sustainable rural development: A multifaceted and promising convergence. Sociologia Ruralis. 2001;41(1):112-130.
26. Qaim M, Kouser S. Genetically modified crops and food security. PloS One. 2013;8(6)
27. Reardon T, Berdegué J, Escobar G. Rural nonfarm employment and incomes in Latin America: overview and policy implications. World Development. 2001;29(3):395409.
28. Reganold JP, Wachter JM. Organic Agriculture in the Twenty-First Century. Nature Plants. 2016;2(2):15221.
29. Reganold JP, Wachter JM. Organic agriculture in the twenty-first century. Nature Plants. 2016;2(2):1-8.
30. Rezaei EE, Wang Q, Wang Y, Kariyawasam C, Sadeghpour A, Zhu H. A review of precision agriculture research and applications: A mapping study. Sustainability. 2020;12(15):6146.
31. Schimmelpfennig D. Farm profits and adoption of precision agriculture. Journal of Agricultural Economics. 2016;67(3):694-710.
32. Spiertz JHJ. Nitrogen, sustainable agriculture and food security: a review. Sustainable Agriculture. 2009;635-651.
33. Sui R, Li J. Precision Agriculture and Soil Information System: A Review. Precision Agriculture. 2017;18(3):299321.
34. Tilman D, Balzer C, Hill J, Befort BL. Global Food Demand and the Sustainable Intensification of Agriculture. Proceedings of the National Academy of Sciences. 2011;108(50):20260-20264.
35. Tittonell P, Giller KE. When yield gaps are poverty traps: The paradigm of ecological intensification in African smallholder agriculture. Field Crops Research. 2013;143:76-90.
36. Torhonen MP, Prettitore PS, Scheierling SM, Hilhorst T, Roquet V, Zakout W. Enabling the business of agriculture 2019. World Bank Group; c2019.
37. Velten S, Leventon J, Jager N, Newegg J. What is sustainable agriculture? A systematic review. Sustainability. 2015;7(6):7833-7865.
38. Willer H, Lernoud J. The world of organic agriculture. Statistics and emerging trends 2019. Journal of Organic Systems. 2019;14(1):10-25.
39. Zhang Q, Liu Y, Gong C, Chen Y, Yu H. Applications of deep learning for dense scenes analysis in agriculture: A review. Sensors. 2020;20(5):1520.