Response of Yield of Safflower (Carthamus tinctorius L.) to Phosphate Fertilizer Application and Spraying with Humic Acid

Sahar Laftah(1)* and Sundus abdu alkariem al-Abdulla (1)

(1). Crops department, Faculty of agriculture, Basrah University, Iraq.

(*Corresponding Author: Sahar Laftah. E-mail:

Received: 12/08/2022                          Accepted: 9/10/2022


The experiment was carried out in Agriculture College farm / Basra University – Karmat Ali location(30° 57ʹ N lat.,47° 80ʹ long ), on silty loam soil during the winter growing season 2021-2022 to studying the effect of three rates of phosphate fertilizer(0, 60 and 120 kg P/ ha) and spraying with four concentrations of humic acid (0, 6, 12 and 18 g/ l) and the interaction between them on yield component and seed yield of Safflower cultivar Gila .The experiment was factorial in R.C.B.D design with three replicate. The results showed a significant effect of adding phosphate fertilizer with the rate of  120 kg P/ ha which gave the highest averages in most of the study characteristics, the highest seed yield, petals yield their averages were 3.911 M ha , 11.12 gm/ plant .The effect of spraying with humic acid at a concentration of 12 g/ l  was significant and produced the highest averages of seed  yield , dry yield of petals and amounted to 4.031 Mg/ ha and 12.12 gm/ plant respectively .The results showed a significant effect of the interaction .Rate of phosphate fertilizer 120 kg P/ ha with 12 g/ l of humic acid produced the highest seed yield, dry petals yield reached 4.753 µg / ha, 13.67 gm/ plant respectively.

Key words: Safflower, Phosphor, Humic acid, petals yield, Biological yield

Full paper in Arabic: pdf