Simulation of corn productivity at different sowing times

Corn (Zea mays L.) due to its importance in human and animal diets is one of the most widespread crops in the world. The AquaCrop model was used in this study to simulate total and daily biomass production grain productivity and to obtain a corn yield forecast for the Arapiraca region Alagoas. The model uses canopy cover (CC) instead of leaf area index (LAI) as the basis for separately calculating plant transpiration and soil water evaporation. Yield is calculated as the product of biomass and harvest index (HI). The model input data were from an experiment conducted by Medeiros (2008) in the village of Batingas in the municipality of Arapiraca-AL. For the four sowing seasons the results of soil water storage simulated by the AquaCrop model showed a similar variation trend to the observed values. This procedure allows for an adequate estimate of grain yield 18 days prior to harvest in the Agreste Alagoano region enabling end users of the model to plan the storage logistics and marketing of the grain crop to be harvested.