Document Type : Original Article
Authors
1 Ph.D student, Water engineering Department, Imam Khomeini International University, Qazvin, Iran
2 IKIU
3 Associate Professor, Water engineering Dept., Imam Khomeini International University, Qazvin, Iran
4 M.Sc Gratuated, Irrigation and Reclamation engineering Dept., Tehran University, Karaj, Iran
Abstract
Climate change, caused by fluctuations in meteorological parameters such as temperature, affects environmental and agricultural processes. Understanding these parameters and estimating crop yield before harvest play a key role in improving production management, increasing farmers' income, and facilitating food supply planning. since crop production is the outcome of interactions between plant processes and climatic variables.In this study, the yield and biomass of maize (Single Cross 704 hybrid) were estimated based on two temperature-related parameters: mean maximum temperature and cumulative temperatures exceeding the crop's threshold. Yield and biomass estimation equations were developed both seasonally and at different growth stages. The aim of this study is to investigate the effects of temperature parameters and to predict yield components under temperature variations. According to the results, the seasonal yield equation based on mean maximum temperature showed good performance with R² = 0.79 and RMSE = 0.84, while the seasonal biomass equation based on cumulative threshold exceedance had R² = 0.67 and RMSE = 0.72. In stage-based equation development, yield estimation based on both temperature parameters yielded R² and RMSE values of 0.90 and 0.57, and 0.88 and 0.68, respectively. The stage-based biomass equation using mean maximum temperature showed acceptable accuracy with R² = 0.83 and RMSE = 0.52.
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