The investigation of leaf number, leaf area and plants dry weight in three cucumber cultivars (Cucumis sativus L.)

The variation of leaf number and area on fruit weight, fruit number and plant yield in relation with environment temperature in three cucumber cultivars (Green Gold and Dharwad native of India and a new cultivars namely Super Dominus) in experimental field of Gorgan university were studied in 2007. In this study, the first flowers after formation of 4.99, 17.74 and 28.5 leaves in Green Gold, Dharwad and Super Dominus appeared, respectively. This obtained results showed that after planting with increase of daily time, leaf number, leaf area and dry weight (g) increased as well. Then with progress of plant growth the amount of heat unit which is required for completing of a leaf, one cm2 leaf area and one gram dry weight decreased. This trend continued till the end of harvesting that was lowest. The results showed that essential heat for fruit set in Super Dominus, Dharwad and Green Gold were 470.5, 485 and 593.25 degree days, respectively. A negative correlation (-0.86) were observed between the number of fruits per plant and their weight. In this research between time of first harvest and fruit number negative correlation (-0.93) observed but the correlation (p)