Evaluation of water stress and phosphorous fertilizer on yield and yield components in Nigella sativa L

Abstract. This investigation carried out in order to study the effects of irrigation times and phosphorous fertilizer on yield and yield components on Nigella sativa in split plot design with three replications based on randomized complete block designed at Sepahan Nama research farm in Jellan Abad of Isfahan. The main factor was irrigation time with three levels including 50, 100 and 150 mm evaporation from flash tank of A class. The sub plot was different phosphorous fertilizer levels including control, 75 and 150 kg/ ha P (triple super phosphate fertilizer). Measured traits were including number of capsule per plant, number of seed per capsule, seed weight to capsule, 1000-seed weight, biological yield, seed yield per meter squares and plant height. Variance analysis showed that all traits had significant differences for different levels of irrigation time, phosphorous fertilizer and interaction them. Result described which the highest biological, seed yield per plant and area obtained at 100 mm evaporation and 150 kg/ h P and the lowest these traits was obtained at 150 mm evaporation from flash tank and 150 kg/ha P. Result showed to production of suitable yield must be attended to irrigation parameters and consumption of phosphorous fertilizer. Also result described which more and less use of irrigation is not suitable for high production of seed yield.