Factors Influencing Agriculture: 8 Drivers With Data

The main factors influencing agriculture are weather and climate, soil and water, pests and crop genetics, input costs and prices, policy and land rights, technology, and the people and farm structures behind the work. Droughts and extreme heat alone cut national cereal production by 9–10% in the affected years, in a study of reported disasters from 1964 to 2007 (Lesk et al., Nature, 2016). This guide ranks no single factor first. It shows how each one works, gives dated numbers from official sources, and ends with a calculator that tests how a yield, price or fertilizer change moves your own margin.

The list suits students, farm managers, lenders and advisers in the US, Canada, the UK and Europe, and Australia and New Zealand. Where a number comes from one country, the text says so.

Factors influencing agriculture at a glance

Use this table as a map. Each row links to a section below with the source behind it.

1. Weather and climate

Temperature decides which crops can grow and when. Rainfall and its timing decide irrigation need and the length of the growing season. Extreme events such as drought, flood and heat waves hit planting, flowering and harvest directly.

The clearest global number comes from a study of national records for 1964–2007. It found that droughts and extreme heat reduced national cereal production by 9–10%, while the data could not show an effect from floods or extreme cold. Drought cut both harvested area and yield, and heat mainly cut yield. The same study found about 8–11% more damage in developed countries than in developing ones, which shows that wealth alone does not shield a farm from weather.

What this means on the farm: keep a local weather record for each field, plan planting dates around frost and heat risk, and spread risk with more than one crop or variety. For weather inputs in your own software, see the weather data developer documents in the related pages line at the end.

The same study shows a trend worth noting: damage from more recent droughts was about 7% greater than from earlier ones, so the past is not a perfect guide to the next dry year. Three questions help turn this into a plan for one farm.

• When is the crop most sensitive to heat or water stress, and how often did that window fall in a hot or dry spell in the last ten years?
• Can you move planting dates, change variety maturity or add irrigation to avoid that window?
• If a bad year does come, what cash, insurance or contract protects the next season?

Local weather stations, national weather services and university extension offices publish the long records needed to answer these questions. A single season of your own notes adds field-level detail that regional records cannot show.

2. Soil and water

Soil texture, organic matter, pH and compaction decide how much water and nutrient a crop can reach. Erosion, salt build-up and compaction reduce that supply over years, not days.

Soil loss is measurable. Eurostat estimates that 5.1% of the EU’s non-artificial erodible land was at risk of severe erosion by water in 2023, defined as more than 10 tonnes of soil lost per hectare per year. Mediterranean and Alpine countries were the most exposed, and northern and Baltic countries generally had lower risk.

Water is the other half. FAO reports that agriculture accounts for 72% of global freshwater withdrawals, with irrigation the main use, and that 1.2 billion people live in farming areas with severe water constraints. FAO also notes that farming must produce 50% more food, feed and fibre by 2050 than in 2012, while freshwater demand is expected to rise by a further 25%.

For a single farm, the practical steps are the same everywhere: test soil on a schedule, record irrigation volumes, and match water to crop stage instead of the calendar. Fertilizer rates should follow a soil test and local extension advice; check the product label and local rules before you apply.

Farmland is also a large share of land in many places. In the EU, farms managed 156.2 million hectares of utilised agricultural area in 2023, which is 38.1% of the EU land area, and 73.6% of Ireland’s land was farmland (Eurostat, 2023). With that much land under management, small gains in soil cover and water use add up across a region.

• Soil structure and organic matter: set water storage and root depth.
• pH and nutrient balance: set which fertilizer is useful and which is wasted.
• Compaction: slows roots and drainage, and often traces back to wet-soil traffic.
• Irrigation access: widens crop choice but depends on a source that may be limited.

3. Pests, disease and crop genetics

Pests and diseases take yield every season. A 2019 expert assessment covering 137 pathogens and pests in five crops estimated global yield losses of 21.5% for wheat, 30.0% for rice, 22.5% for maize, 17.2% for potato and 21.4% for soybean. These are expert estimates for the years assessed, not field measurements, and the ranges around them are wide, as the chart shows.

Chart

Estimated yield loss to pests and diseases

% of yield, range across the regions assessed, five major crops (expert assessment)

US university and extension scientists publish similar estimates for corn, cotton, soybean and wheat. The Crop Protection Network states that its loss values are expert estimates, not actual loss values, and uses them to track disease and insect trends over time.

Genetics matter because a variety that suits your climate and carries disease resistance lowers both risk and spray need. Monoculture raises risk: one disease or insect can hit every field at once. Rotations, resistant varieties and scouting form the core of integrated pest management. Always follow the product label and local rules when you use any crop protection product.

The 2019 assessment gave these ranges across the regions it covered: wheat 10.1–28.1%, rice 24.6–40.9%, maize 19.5–41.1%, potato 8.1–21.0% and soybean 11.0–32.4%. Its authors link the highest losses to regions with food shortages and fast-growing populations, and to new or returning pests and diseases. Pests and diseases also change over time, so a pest list from ten years ago may be out of date for your area.

1. Scout on a fixed schedule and record what you find, with dates and field names.
2. Rotate crops to break disease cycles.
3. Choose varieties with the disease resistance your area needs.
4. Use thresholds from your extension service before you spray.
5. Keep field edges and natural enemies of pests in place where you can.

4. Input costs, prices and credit

Prices decide whether a good crop is also a profitable one. Seed, fertilizer, fuel, labor and rent set the cost side. Commodity prices, contracts and market access set the income side. Credit and crop insurance decide how well a farm survives one bad year.

Fertilizer shows how fast costs can move. The World Bank reported that its fertilizer price index rose more than 12% in the first quarter of 2026, and that by April 2026 it stood at its highest level since October 2022. Urea went above US$850 per metric ton in April 2026, up 80% since February, after export disruptions through the Strait of Hormuz. The Bank’s April 2026 outlook projected the index to rise by more than 30% in 2026 and to ease in 2027. Treat that as a projection, not a promise.

Rising input costs and falling yields pull in the same direction: lower margin. The calculator below lets you test your own farm. It starts near break-even so that small changes show clearly. Enter your own yield, price and cost figures.

Fertilizer has swung before. The World Bank notes that fertilizer prices jumped by more than 100% in 2021 and by 55% in 2022 during supply disruptions, and that the 2026 rise, though sharp, remained well below those spikes. For a farm, the lesson is to budget a range for fertilizer instead of one price, and to ask your supplier for a quote with a date.

• Fixed costs such as rent, machinery payments and interest do not fall when yield falls.
• Variable costs such as seed, fertilizer, crop protection and drying move with your decisions.
• Price risk can be reduced with forward contracts, storage or crop insurance, depending on your market. Ask a lender or adviser what suits your case.
• Credit terms matter as much as price: a late payment can cost more than a modest price gain.

Try the numbers for your own farm below.

5. Policy, land rights and rules

Subsidies, price supports, trade rules, environmental limits and food-safety rules change what is worth growing and how. Secure land tenure also matters: a grower who may lose the lease is less likely to invest in drainage, terraces or trees. Rules differ by country, state and even watershed, so the useful habit is to list the rules that apply to each field and check them once a year.

Three categories deserve a regular check. First, input rules: which pesticides and fertilizer rates are allowed, and where. Second, water rules: licences, limits and reporting. Third, reporting and traceability rules from buyers or governments. Get professional or legal advice for lease, tax, loan and insurance decisions; this guide is general information only.

Extension services connect research to practice. They turn field trials into local advice, which is why training and advisory access appear in nearly every list of what shapes farm outcomes.

• Subsidies and payments: check eligibility and conditions every year, since rules change.
• Trade rules: tariffs, standards and import checks change which markets are open.
• Environmental rules: buffer strips, nutrient limits and water licences vary by region.
• Land tenure: written leases and clear titles support long-term investment.

Rules in the US, Canada, the UK and Europe, and Australia and New Zealand differ from each other and change often. Read the current text from the responsible agency, or ask a local adviser, before you act on any summary, including this one.

6. Technology and data

Sensors, GPS guidance, yield monitors, drones and satellite images show how fields vary, so that seed, water and nutrient can follow the variation. The USDA Economic Research Service tracked adoption in six US crops. It found that auto-steer guidance was used on 5.3% of planted corn acres in 2001 and 58% in 2016.

Chart

Share of US corn acres using auto-steer guidance

% of planted corn acres, 2001 and 2016

The same report found that adoption depends on farm size. At least half of relatively large row-crop farms used yield maps, soil maps, variable-rate technology or guidance. Except for cotton, fewer than 25% of the smallest farms (the lowest fifth by acreage) used any of the four. Scale, not interest alone, can decide who adopts.

Satellite images add another layer of information. The Farmonaut Satellite + AI Farm Monitoring System shows vegetation change field by field through the season. A drop in a vegetation index tells you where to walk the field; it does not name the cause, so confirm with scouting and soil tests.

The ERS report adds that many digital tools are now built into machines. It notes that purchase prices for these technologies are harder to estimate than in the 1990s because they come bundled with basic equipment. In practice, many farms may therefore get a tool when they replace a tractor or combine.

• Guidance and auto-steer: reduce overlap and driver fatigue.
• Yield monitors and maps: show which parts of a field earn their input cost.
• Soil maps and variable-rate application: match rates to zones.
• Satellite and drone images: show where crops differ and which areas to scout.

▶ Six plain steps to start precision agriculture on a farm without buying a robot. · 4:18

7. People, farm size and farm structure

Farmers are fewer and farms are larger in North America. USDA NASS estimated 1,865,000 US farms in 2025, down 15,000 from 2024, with an average size of 469 acres. In 2025, 48.0% of US farms had sales under US$10,000, and farms with sales of US$500,000 or more (9.9% of farms) operated 50.1% of farmland. The count of farms fell in every sales class except the largest.

Chart

Number of US farms

thousands of farms, 2018 to 2025

Canada shows a similar direction. Statistics Canada counted 189,874 farms in the 2021 Census of Agriculture, 1.9% fewer than in 2016, and the average operator age was 56.0.

The picture in Europe is different. Eurostat reports 8.8 million EU holdings in 2023, about 62.8% of them under 5 hectares, while 7.6% had 50 hectares or more. The chart converts the three averages to hectares; note the different bases in its sub-title.

Why this matters: farm size shapes who can afford machinery, who has a successor, how much labor the farm hires and how it sells. Consumer demand for labels such as organic also shapes which farms choose which systems; for a full guide, see our steps of farming guide and our page on land use types.

Averages hide wide spreads inside a country. Statistics Canada’s 2021 census shows 34,128 farms on 60.3 million acres in Saskatchewan, roughly 1,770 acres per farm by our calculation, against 1,195 farms on 504,674 acres in Prince Edward Island, roughly 420 acres per farm. In the EU, larger farms of 50 hectares or more were relatively common in Luxembourg (53.0% of farms), France (48.4%), Finland (35.1%), Denmark (33.6%) and Germany (32.0%) in 2023, while small holdings dominate in other countries.

Labor, education and succession complete the picture. Older operators, fewer successors and tight rural labor markets push farms toward machinery, contract services and larger units. Training and advisory access help farms use new tools well; the USDA ERS technology report also found that adoption rises with farm size, so smaller farms may need shared equipment or custom hire to reach the same tools.

Chart

Average farm size: US, Canada and EU

hectares per farm; US and Canada use all land in farms (2025, 2021), EU uses utilised agricultural area (2023)

▶ What technology in agriculture does to rural towns: money, jobs and internet. · 3:50

8. Stewardship and sustainability

Soil, water and biodiversity are the base of future yield. Practices such as reduced tillage, cover crops, rotations, buffer strips and trees on farms protect that base. Their benefits build slowly, and costs often come first, so the gain is a long-term one. Buyers and regulators now ask more often for records of what a farm did, which is why simple field logs help.

Carbon and footprint records are one example. Rules and buyer demands differ by market and keep changing, so check the current requirement for your crop and region before you invest in measurement.

▶ Regenerative practices such as no-till, cover crops and carbon farming, and how they relate to soil health. · 10:25

How the factors work together

No factor acts alone. A drought lowers yield, which cuts income, which limits money for fertilizer and seed next year. Better technology helps most where training, credit and stable rules are in place. Strong soils soften the effect of a dry spell, and secure land rights make it worth building soil in the first place.

Three pairs show the link. Weather and credit: a weak year with no insurance or reserve forces sales at low prices. Technology and farm size: tools that need scale favor larger farms unless shared or rented. Policy and stewardship: rules that pay for soil cover or limit runoff change which practices are worth the cost.

How to rank the factors on your own farm

1. List each field with crop, soil type, water source and last three yields.
2. For each of the eight factors, write the one event that cost you most in the last five years.
3. Score each factor for how likely it is and how much it would cost; multiply the two.
4. Use the calculator to put a dollar value on your top two risks.
5. Pick one action per risk, such as a soil test, a second variety, a forward contract or a field log.
6. Review once a year, after harvest.

How we checked the numbers

All figures come from pages we opened: Nature papers for weather and pest loss, FAO for water, Eurostat and Statistics Canada for the EU and Canada, USDA NASS and ERS for US farms and technology, and the World Bank for fertilizer prices. Each number carries its year. Price figures are World Bank monthly or quarterly commodity data, not dealer quotes, so local prices will differ. Loss figures from Nature and the Crop Protection Network are expert estimates. Where a source covers only one country or period, the text says so. Every source is listed at the end of the page.

FAQ

What are the factors influencing agriculture?

Weather and climate, soil and water, pests and crop genetics, input costs and prices, policy and land rights, technology, the people and structure of farms, and stewardship of soil and water. They interact, so a change in one often shifts the others.

Which factor has the biggest effect on yield?

It depends on crop and place. At national level, droughts and extreme heat cut cereal production by 9–10% in the years they struck, in a long-run study (Nature, 2016). Pests and diseases are estimated to take 17–30% of yield in five major crops (Nature Ecology and Evolution, 2019). Neither number is a forecast for your farm.

How do prices and costs influence farming decisions?

They set margin. A rise in fertilizer cost can change crop choice or application plans, as seen when urea passed US$850 per tonne in April 2026 (World Bank). Use the calculator above to test your own case.

Why are farms getting larger in the US?

USDA NASS shows fewer farms and larger average size: 469 acres in 2025, up from 444 in 2018. The data do not give one cause. Machinery, technology and economics of scale are common explanations, but check each source before you rely on one.

How can satellite data help?

Satellite images show where vegetation differs across a field and how it changes over the season, so you can scout the right place first. They do not tell you the cause of a problem; confirm it with scouting, soil tests and local advice.

Related pages on our site: steps of farming, land use types, corn yield and farm income by state, carbon footprint tracking, crop loan and insurance checks, product traceability, fleet and machinery management, weather data developer docs, satellite data API, mobile app page.