The effect of stopping irrigation and using superabsorbent on the morphological, quantitative and qualitative characteristics of sunflower grains

The present study was carried out in 2017 in the farm Milajard city, in order to investigate the effect of stopping irrigation and using Stacozorb superabsorbent on the morphological, quantitative and qualitative characteristics of Progress sunflower in the form of a split plot experiment based on a randomized complete block design with four replications. Irrigation treatment as the main factor in three levels of full irrigation, stop irrigation from the budding stage (45 days after planting) and stop irrigation from the flowering stage (55 days after planting) and use of super absorbent as a sub factor included four levels of no use of super absorbent, consumption of 30, 60 and 90 kg.ha. The highest yield of oil and grains and components of grain yield were obtained in the treatment of full irrigation and consumption of 90 kg.ha of superabsorbent, and the lowest amount of these traits in the treatment of interruption of irrigation was obtained from the stage of budding and no use of superabsorbent. Considering the importance of the economic characteristic of oil yield in sunflower, the stress of interrupting irrigation in budding and flowering stage caused a decrease, respectively, and these negative effects of water deficit stress were adjusted by using superabsorbent, so that the high amount of superabsorbent (90 kg.ha) had the greatest effect in improving the investigated traits under low irrigation conditions (according to the stress in budding and flowering stage) to the extent of (7.36 and 6.73 percent).