Thermal Requirement, Heat and Radiation Use Efficiency of Kharif Soybean in Middle Gujarat Region as Influenced by Cultivars and Plant Geometry

The present study proposes to measure the thermal requirements, heat and radiation use efficiency of kharif soybean cultivars (NRC 37, GS 1 2) in central region Gujarat. findings conclude that among all different geometry 30 x 10 cm produced highest seed (4403 kg/ha) total biomass yield (5818 over other two spacing because higher (heat (HUE) for Growing degree day (GDD)- 0.69 kg/ha/°C Day; HUE Heliothermal units (HTU) - 0.14 Day hour; Photothermal (PTU) 0.05 hour). cultivar NRC 37 (4415 followed by (3799 2 (3670 kg/ha). Heat unit requirement (GDD 1952°C HTU – 9894°C PTU-25974°C hour) was more as compared 1951°C day; 9893°C PTU-25973°C 1931°C 9809°C PTU-25681°C hour), respectively. (RUE) are 45 5 geometry.