Influência do déficit hídrico no rendimento da cultura da soja, em diferentes estágios de desenvolvimento.

Abstract

This study was carried out at the region of Palotina, state of Paraná (latitude of 24º17 S, longitude of 53º50 30 and altitude of 333 meters), where the growth and development of the soy crop simulation model was used (Glycine Max (L) Merrill), CROPGRO-SOYB, adjusted by Dallacort (2004), for you cultivate them of soybean COODETEC CD-202, CD-204, CD-206 and CD- 210. The simulation model (CROPGRO-soybean),(Boote et al. 1998), developed for the simulation of the growth, development and productivity of the soybean, considering the swinging of water in the soil. Through simulation, the influence of the deficit hídrico was analyzed in different apprenticeships of development of the culture, where it can be concluded that the precipitation is the climatic factor that more influences in the productivity of the soy, being the period of 20 days before the florescimento and the florescimento phase, the phase more critic of the culture. The measure that the sowing is accomplished in later times, there was m decrease of the productivity.