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Summary — Using evaporative cooling to fight heat stress in corn. The potential of sprinkler irrigation to reduce air and reproductive organ temperature. During the flowering of corn, heat stress combined with a low water supply may be the cause of unsuccessful fertilization. In order to reduce the heat stress of reproductive organs, evaporative cooling using sprinkler irrigation is a method applicable in seed production. The objective was to characterize the canopy microclimate under irrigation (air temperature at three levels) and quantify the ear temperature reduction as a function of irrigation periodicity and intensity. The experimental study was carried out in the Toulouse region of France on two plots. One plot was irrigated once a week, the other irrigated daily during the warm period of the day (12-17 h GMT). The results showed that ear and tassel temperature decreased immediately after irrigation started, whereas air temperature decreased 2 h later. Under higher irrigation frequencies, the mean temperature difference between the two plots was about 3 °C for ears and 2 °C for air at mid-height inside the canopy; for lower frequencies, the mean temperature difference was 2 °C for ears and 1 °C for air inside the canopy. The potential of sprinkler irrigation to reduce heat stress duration on reproductive organs is discussed.

agronomie

Modification du microclimat d'un couvert de maïs au moyen de l'irrigation par aspersion en vue de la gestion des stress thermiques des organes reproducteurs