The common one is climate change which is affecting almost all countries. However challenges vary depending on the region. These could be related to soil, inputs (seed, fertilizer), markets, diseases and pests......
Irrigation of agricultural crops comprises 70% of global water use, and agriculture directly contributes to around 11% of global greenhouse gas (GHG) emissions (mostly through cattle). Expanding agricultural land can also lead to deforestation, additional GHG emissions, and a loss of biodiversity. https://www.oecd.org/agriculture/key-challenges-agriculture-how-solve/
Current challenges facing the global food system. Let’s start with the most obvious one. The global food system is expected to provide safe and nutritious food to a population that will likely grow from 7.5 billion people today, to nearly 10 billion by 2050. Not only will there be more mouths to feed, but as incomes grow in emerging and developing economies, so too will the demand for meat, fish, and dairy. However, food production is only one aspect of the food system. The agro-food sector also provides a livelihood for millions of people. Globally, most of the people living in extreme poverty are in rural areas where food production is often the most important economic activity. There are an estimated 570 million farms worldwide today, and millions of other people work in food-related jobs. The global food system also has a large environmental footprint. In fact, agriculture occupies nearly 40% of the earth’s surface, far more than any other human activity. In addition, irrigation of agricultural crops comprises 70% of global water use, and agriculture directly contributes to around 11% of global greenhouse gas (GHG) emissions (mostly through cattle). Expanding agricultural land can also lead to deforestation, additional GHG emissions, and a loss of biodiversity.
Access to markets is one of the biggest challenges faced by smallholder farmers which directly affects their income and living standards. Lack of market facilities and poor government regulations poses serious threats to farmers, where after harvesting they are unable to sell off their produce at good prices. https://efarms.com.ng/blogs/2018/05/05/farmers-struggle-agriculture/
Many developing countries are exploring whether biotechnology has a role in addressing national issues such as food security and environmental remediation, and are considering whether the putative benefits of the technology-for example, enabling greater agricultural productivity and stability in the food supply-outweigh concerns that the technology might pose a danger-to biodiversity, health, and local jobs. Some policy leaders worry that their governments are not prepared to take control of this evolving technology and that introducing it into society would be a risky act. Others have suggested that taking no action carries more risk, given the dire need to produce more food. This book reports on an international workshop held to address these issues. Global Challenges and Directions for Agricultural Biotechnology: Mapping the Course, organized by the National Research Council on October 24-25, 2004, in Washington, DC, focused on the potential applications of biotechnology and what developing countries might consider as they contemplate adopting biotechnology. Presenters at the workshop described applications of biotechnology that are already proving their utility in both developing and developed countries.https://www.nap.edu/catalog/12216/global-challenges-and-directions-for-agricultural-biotechnology-workshop-report
The main global challenge in the field of agriculture in the 21st century is the development of sustainable organic farming. Moreover, the structure of agricultural production will change in the future. Currently, 3/4 of the global area of arable land is exploited for the production of crops that serve as feed for livestock instead of producing food directly for humans. This crop structure will change in the future, as the growing problem of hunger in the poorest countries and increasing drinking water shortages and climate change will force a more sustainable agricultural economy.