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La Nina may cut Brazil's 2025-26 winter corn

  • : Agriculture, Fertilizers
  • 25/12/19

Brazil's 2025-26 winter corn crop may face slight losses following the La Nina climate phenomenon, which delayed soybean planting.

Farmers plant soybeans and winter corn in the same area, so delays in the oilseed planting could push back grain sowing.

Areas sown outside the official planting window for the 2025-26 corn crop are subject to adverse weather conditions and risk reaching their reproductive stages of grain filling and flowering, which are more sensitive to water stress, at the height of winter in Brazil, when the weather is dry.

The deadline for concluding soybean sowing in the center-west — which encompasses Goias, Mato Grosso, and Mato Grosso do Sul states — was 10-25 October for winter corn to be sown and developed with low climatic risk. The closing period for a winter corn crop with medium climatic risk was 21 October-5 November, according to market participants.

Irregular weather at the start of the 2025-26 soybean planting caused a delay in some regions. Mato Grosso and Mato Grosso do Sul states finalized sowing in the weeks ended 5 December and 13 December, respectively. Planting in Goias state reached 97pc completion by 13 December.

If corn planting is significantly delayed, farmers may also reduce the technology for planting. Planting outside the ideal window can harm productivity and, hence, the profitability of the crop. Prices of inputs needed for grain cultivation are higher this season, which can demotivate farmers to invest amid uncertain output. Production costs for Mato Grosso's 2025-26 winter corn crop rose from the previous one, with fertilizer costs estimated at R1,418/hectare ($256.50/ha) from R1,342/ha a year prior, according to the state's institute of agricultural economics Imea.

But current estimates have yet to reflect this scenario. National supply company Conab kept its third estimates, released in December, mostly stable from the first outlook for the season published in October. Brazil is expected to produce 110.5mn metric tonnes (t) of corn in the second crop, 2.4pc less than the previous cycle's 113.2mn t. The drop reflects the expected 6pc decrease in yields to 6,105 kg/ha from 6,496 kg/ha. This may come despite the nearly 4pc increase in planted area to 18.1mn ha (181,000km²).

Corn prices are expected to remain stable in the coming months, according to Investment bank Itau BBA forecasts. The 2024-25 corn season — considering the first, second and third crops — increased by nearly 21pc, or 24.2mn t, but high domestic demand helped sustain prices. Total 2025-26 corn output may drop by 1.5pc, or 2.2mn t, but it is expected that prices may be firm due to the competition between domestic and export markets.

La Nina effects

La Nina provoked irregular rainfall in October-November and consequently delayed the 2025-26 soybean planting window.

The La Nina phenomenon is an abnormal cooling of the equatorial waters of the Pacific Ocean. The consequence of this phenomenon in Brazil is a delay in the start of regular rainfall, reducing volumes in the south and increasing humidity in the north and northeast. Although classified as low intensity and short duration, with a peak between November-December, this year's La Nina has been altering rainfall patterns in Brazil and is expected to last until early 2026. The trend is that the country will resume its usual climate patterns as of February.

2025-26 soy crop should maintain record

But Brazil is still on track to produce a record amount of oilseed despite delays to the 2025-26 soybean planting. Although irregular rainfall at the beginning of the season delayed planting in major producing states, the return of regular rainfall should compensate losses caused by a possible drought in southern Rio Grande do Sul state.

Even with Conab's third estimate still forecasting a record harvest of 177.1mn t, 3.3pc above the the 2024-25 cycle, the forecast is lower than the 177.6mn t in Conab's first projection. The drop is a result of lower estimates for nationally planted area, which fell to 48.9mn ha in the third estimate from 49.1mn ha in the first.

By Sofia Zizza


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