Aplica??o do modelo CERES-maize na análise de estratégias de irriga??o para milho 'safrinha' em Londrina-PR

摘要

Irrigation strategies for the "out season" corn were analyzed in different sowing times in Londrina - PR using the CERES-maize capacity to simulate the growth of the corn under a range of atmosphere and management conditions. The simulate treatments were constituted of the corn hybrid XL-520, in 12 sowing times, in the period from January to May, being adopted five criteria for irrigation application, besides a level without irrigation and another of potential production. For simulations it has been used the meteorological data of the available historical series (24 years), the predominant soil characteristics of the place and the management of the regional technical recommendations for corn cultivation. The results revealed that the irrigation was a viable alternative, because it elevated the yield in all sowing times, varying, on average among 5,800 to 8,000 kg ha-1, and it reduced the establishment risks and crop frustration for this cultivate. In all the levels, the irrigation resulted in better yields along the whole analysis period, related to condition without irrigation, except in the first sowing time of January.