Soybeans: Extraction

The nitrogen-fixing trick that pairs soy with maize

Soybeans were grown in China more than 4,500 years ago (Geman, pdf p. 155). The plant is a legume that fixes its own nitrogen, so it rotates well with maize. US farmers sow in April and May, and pod-setting in August decides the yield (pdf p. 155). Brazil's soy frontier pushed north into the Cerrado grasslands, where yields now match the US (pdf p. 157). Most beans are not eaten whole. Crushers crack and flake them, extract the oil with solvent, and toast the remaining meal, which is 75-80% of the bean by weight (pdf p. 159).

Soybeans are an annual legume grown on large mechanised farms in Brazil, the United States, Argentina and Paraguay, and on small rainfed plots in India and China. The bean is rarely the end product. Most of it is crushed into meal and oil near the farm (Argentina, India) or near the consumer (China, EU). The main split is therefore between farming systems, which set cost per tonne, and the crushing step, whose margin (the 'board crush') decides whether beans move as beans or as meal and oil. Export taxes and import tariffs push countries toward one model or the other.

Methods compared

How each method works

Soy is planted September-December on the Cerrado and in the South, often followed in the same year by safrinha maize. Farms run from thousands to hundreds of thousands of hectares. Beans move by truck, barge and rail to southern ports or the newer Arco Norte ports.

Lowest-cost frontier supply and room to expand, but long inland haul and deforestation scrutiny (EU deforestation rules).

Soybeans alternate with maize across Illinois, Iowa and the Midwest, using GM seed, no-till and large machinery. Beans are sold to local crushers or moved by barge down the Mississippi to Gulf export terminals.

Reliable logistics and data, but higher land cost than Brazil and exposed to Chinese tariffs.

Farms in the Pampas grow soy under no-till. Most of the crop is crushed in large plants on the Parana river near Rosario and shipped as meal and oil rather than beans, partly because export taxes are lower on products.

Efficient river crushing cluster, but export taxes and drought (2023) make supply volatile.

Sown with the monsoon on black soils of Madhya Pradesh, Maharashtra and Rajasthan, mostly on small farms with little irrigation. Farmers sell in mandis; the state buys at the minimum support price (MSP) when market prices fall below it.

Non-GM and close to Asian feed markets, but yields are a third of Brazil's and the crop depends on the monsoon.

Beans are cleaned, cracked, dehulled, conditioned and flaked; hexane dissolves the oil, which is then recovered by distillation. The defatted flakes are toasted into meal. Crush margin = value of meal plus oil minus cost of beans.

Low-margin, high-volume business; plants located either at origin (Argentina, India) or destination (China, EU) depending on tariffs.

Who does it: global

Who does it: India

India is the fifth-largest grower (3.8% of world output in 2024, FAOSTAT) but a net importer of soybean oil. Its non-GM soymeal exports were 22.75 lakh t in oil year 2023-24 (SOPA), led by Iran and Bangladesh, and 21.27 lakh t in FY2024-25. Official and industry crop numbers differ widely: the Agriculture Ministry's second advance estimate for 2024-25 was 151.32 lakh t against SOPA's 125.82 lakh t.