Rice and Corn Are Sown on Almost the Same Area and Corn's Seed Market Is Nearly Four Times the Size

Rice is harvested from 172 million hectares and maize from 210 million. On FAO’s 2024 figures the two crops occupy almost the same land, with rice covering 81.9 per cent of the maize area. Their seed markets are nowhere near each other: corn seed was worth USD 24.60 billion in 2025, rice seed USD 6.35 billion. The ratio is 3.87.

This is the most useful comparison in the seed industry, and almost every explanation offered for it is wrong. Rice is not a small crop, a poor crop or a declining one. It is grown on more land than anything except wheat and maize, and its seed market is growing faster than corn’s — 5.30 per cent against 4.60 per cent to 2033. The gap is about one thing: how much of the seed a farmer buys.

Rice moves 74.4 per cent of corn’s tonnage and earns 25.8 per cent of its value. Two separate mechanisms produce that.

The price gap is the trait layer, and rice does not have one

A tonne of rice seed sells for USD 1,984. A tonne of corn seed sells for USD 5,721, almost three times as much. That difference is not seed quality, germination or packaging. It is what else is in the bag. Hybrid maize carries genetics, herbicide tolerance and insect protection sold as an annual technology subscription, renewed every season because the progeny of a hybrid cannot be saved. Rice seed carries genetics and, outside China’s hybrid segment, very little else — and in most of Asia even the genetics can be saved and sown again.

The corn report is blunt about what that has bought: North America alone is USD 11.27 billion, 45.8 per cent of world corn seed value, and the top four hold 83.4 per cent of the United States market. Rice’s five largest private suppliers together hold under 15 per cent of global value. Yuan Longping High-Tech, the largest, had rice seed revenue of RMB 1.974 billion — about USD 275 million, or 4.3 per cent of the world market.

Most of the rice crop is sown with seed nobody sells

Dividing volume by area is where the arithmetic becomes structural. Maize applies 20.5 kilograms of commercial seed per hectare of maize area — essentially the full planting requirement, because the crop is hybrid on virtually every commercially farmed hectare in the Americas, Europe and China.

Rice applies 18.6 kilograms per hectare. Rice is not an 18-kilogram crop. Transplanted rice takes 40 to 60 kilograms per hectare and direct-seeded rice 60 to 100. On 172 million hectares, a fully purchased crop would absorb between 6.88 and 17.2 million tonnes of seed. The commercial market supplies 3.20 million. Purchased seed therefore covers between 19 and 47 per cent of what the rice crop actually needs, and everything in that gap is seed saved from last harvest or exchanged within a village.

That single ratio explains the whole comparison. Rice and corn are within 18 per cent of each other on area and within 26 per cent on seed tonnage — but rice’s tonnage is only a fraction of its own requirement, while corn’s already is the requirement.

Why the smaller market grows faster

Corn has no conversion left. Maize is hybrid almost everywhere it is grown commercially, so volume grows 1.11 per cent a year and the other 76 per cent of its growth has to come from price and technology. Rice still converts: volume grows 1.90 per cent, and hybrid penetration in India sits at about 6 per cent of 43 million hectares, with core eastern markets nearer 15 per cent.

Two forces push that conversion in the same direction. Direct seeding is displacing transplanting across Asia, and direct seeding needs purchased seed with establishment traits — the IRRI 2025–26 Dong Nai pilot cut seed rates about 25 per cent, or 20 kilograms per hectare, while saving more than 20 per cent of irrigation water and raising yields 15 to 20 per cent. A crop that stops being transplanted starts being bought.

If rice reached corn’s value per hectare at today’s area, this would be a USD 20.14 billion market rather than a 6.35 billion one. That figure is the size of the prize, not a forecast; the published path is USD 9.60 billion by 2033, which assumes only that the purchased share edges up while hybrid penetration in South Asia roughly doubles from a very low base.

What stands in the way

Fragmentation, which is the same thing as saying nobody can afford the trait layer. Corn’s price premium was built by two companies with 60 per cent of world value and the balance sheets to fund a decade of trait discovery. Rice has Chinese provincial breeders, an Indian private tier, public multiplication programmes and no tier-1 position at all. A market structured that way cannot charge corn’s price per tonne, and it will not for the length of this forecast.

The comparison also runs the other way, and it is worth stating plainly for anyone using it to rank the two reports. Corn is the larger market and the slower one. Rice is the smaller market and the only one of the two where volume and value are still converting in the same direction at the same time.

The full datasets and eight-year value paths are in Global Rice Seed Market, Global Corn (Maize) Seed Market and the Global Seed Market hub report.