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Paper Information

Journal:   CROP PHYSIOLOGY   spring 2018 , Volume 10 , Number 37 ; Page(s) 21 To 34.

Effect of zinc sulfate application on quantitative and qualitative yield of safflower under water deficit tension

In order to investigate the effect of zinc sulfate fertilizer on quantitative and qualitative yield of Safflower under water deficit tension conditions, a research was conducted as factorial experiment based on a randomized complete blocks design in three replications in 2016. Experimental treatments consisting of three levels of water deficit tension, irrigation cut at vegetative phase (stem elongation), irrigation cut at reproductive phase ( flowering) and full irrigation(no water deficit tension), and the amount of zinc sulfate fertilizer in three levels, including the lack of fertilizer application(zero), 30 and 60 kilogram per hectare. The duration of application of water deficit tension in each stage of vegetative and reproductive processes was based on evaporation of 140 millimeters water from class A evaporation pan. The results showed that the simple effects of fertilizer and water deficit was significant on all of the traits and the effect of low-water interaction and the amounts of fertilizer on grain yield, one-thousand grain weight, seed oil percentage and chlorophyll content of safflower leaves was significant. As the highest and lowest seed yield (2954. 41 and 680. 75 kilogram per hectare), one-thousand grain weight (50. 52 and 22. 41 g), Oil percentage (28. 96 and 19. 85 percent) and chlorophyll content (62. 89 and 40. 15 spad) belonged to the combination of full irrigation treatment and consumption of 60 kilogram per hectare zinc sulfate fertilizer and combination treatment of no irrigation at reproductive stage and no fertilizer application, respectively. Fertilizer treatment of 60 kilogram per hectare had the maximum number of head (14. 08) and the number of seeds per heads (34. 36). In terms of water deficit tension, lowest number of heads per plant with 9. 63 was belonged to no irrigation treatment at vegetative stage and the lowest number of seeds in head with (11. 79) belonged to no irrigation treatment at the reproductive stage. In general, the use of zinc in the form of zinc sulfate fertilizer could mitigate the harmful effects of water deficit tension especially at the flowering stage in the investigated traits and improve growth conditions for plants and increases yield and yield components of safflower.
Keyword(s): Oil percent,Zinc and Chlorophyll
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