2021 Volume 83 Issue 2 Pages 87-94
The relationship between the occurrence of tomato flower-clusters and environmental factors in greenhouse cultivation was examined and the mathematical models for the duration of flower-clusters occurrence (DFO) were established. Tomato (Solanum lycopersicum L. Var. Culta. Momotarou Haruka) was cultivated by medium culture from September 2018 to May 2019. During cultivation, stem elongation speed gradually increased to 25.68 cm/week after 58 days of transplanting. DFO took 5 to 18 days, while cumulative heat unit (CHU) and cumulative solar radiation (CSR) ranged from 86.5 to 279.1 °C. day, and 31.6 to 230 MJ/m2, respectively. There was a strong significant relationship between CHU and DFO (r2＝0.93, RMSE＝0.73). Multiple regression analyses for DFO using CHU and CSR as explanatory variables indicated the high accuracy of estimation (r2＝0.94, RMSE＝0.71).
