Climate response and phenology Photothermal unit (PTU) Krishicode May 5, 2026 (Last updated: May 5, 2026) 0 comments Photothermal Units (PTU) PTU = GDD × Day Length Maximum Temperature (°C) Minimum Temperature (°C) Base Temperature (°C) Day Length (hours) Calculate Post navigation Previous: Growing Degree Days (GDD)Next: Heliothermal unit (HTU) Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Related Stories Climate response and phenology Thermal time requirement Krishicode May 5, 2026 0 Climate response and phenology Climate productivity index Krishicode May 5, 2026 0 Climate response and phenology Crop Coefficient (Kc) Calculator Krishicode May 5, 2026 0