Document Type : Research Paper

Authors

1 Agriculture Department University of Zabol

2 Department of agronomy,Collage of agriculture,University of Zabol

3 Seed and Plant Improvement Institute Karaj, Iran

Abstract

An experiment in the form of split plots in a randomized complete block design with three replications was conducted at the Agricultural and Natural Resources Research Institute in Zahak to evaluate the effect of drought stress and potassium application on yield and morphophysiological traits of safflower (Goldasht cultivar) under saline irrigation conditions (EC 6 dS.m-1) in 2018-2019. Drought stress irrigation regimes were tested at three levels (irrigation after 45% (control), 65, and 85% of admissible moisture depletion) as the main factor, and potassium fertilizer at four levels (0, 75, 150, and 225 kg.ha-1) as the sub factor. According to the findings, drought stress reduced plant height, number of heads per plant, number of seeds per head, seed and biological yield, and relative water content. The use of potassium, on the other hand, resulted in a significant increase in the above traits. Irrigation after 45% moisture depletion increased seed yield by 42.32 percent compared to irrigation after 85% moisture depletion. Interaction of drought stress and potassium had a significant effect on number of branches per plant, 1000-seed weight, leaf chlorophyll index, soluble carbohydrate content and seed oil percentage; the highest amount observed after 45% water drainage and application of 225 kg K ha-1.

Keywords