what model of time can be used to develop curves of crop yield against time? how to determine if crop yield has been linear can time be squared time can be squared to develop a curvilinear model of crop yield against time what does time squares mean can time squared to develop a curvilinear model of crop yield against time? what model does the yield curve use can time be squared into curvilinear model of a year can the years be scaled for curvilinear model of crop yield when can time be squared when is time squared for curve model what model of time is used to develop a curvilinear model of crop yield can time be squared to develop a curvilinear model of crop yield against time can you square time in a linear model of crop production can time be squared for a curve why does time square in a linear model what years of data do farmers use to develop a linear model of yield? when do you square time can time be squared for a curvilinear curve? can the time be squared in a curve