We test new planting dates for short-cycle cultivars and choose a
threshold date at which soybean may reach physiological maturity
and canbe harvested. We assume that farmers may take 20 days to
harvest soybeans and sow maize, and that maize cycle lasts about
120 days and must reach physiological maturity in May by which time the dry season has already started with potentially negatives effects on productivity. We consider that there is a high probability that a double cropping system is viable if soybean reaches
physiological maturity by the beginning of January. Similarly, we consider that there is medium probability that a double cropping system is viable after climate change if soybean reaches physiological maturity by the middle of January. After this date double
cropping systems are considered unviable.