Correlations Between Canopy Temperature, Chlorophyll Content and Yield In Heat Tolerant Cotton (Gossypium hirsutum L.) Genotypes.

The study aimed to determine relationships among canopy temperature, chlorophyll content, seed cotton yield and fiber quality properties and using these relationships to screen large material in cotton breeding program under field conditions for heat tolerance. In this study 140 lines and 5 control varieties (Stoneville 468, DP 499, SJ-U 86, AGC 85 and AGC 208) were used as plant material. Field experiment was conducted as augmented design with four blocks. Canopy temperature (CT) measured three times during cotton growing, pre-flowering peak flowering and post flowering, on the other hand chlorophyll content was measured in peak flowering stage. The results of this study indicated that seed cotton yield significantly correlated with canopy temperature and was not affected by crop stage development