Vegetative and reproductive stages of soybean are driven by different weather parameters. Temperature is the key factor driving the vegetative growth stages whereas temperature and photoperiod or night length influences the reproductive stages. The soybean growth stage calculator was developed using multiyear field data and analyzing their relationship with response to temperature and photoperiod. The model uses soybean cultivar maturity groups, current weather data, forecast and normal climatic conditions to predict next significant growth stages. Register your soybean fields to get site-specific growth stage prediction.