Effect of injection with microelements, jasmonic and citric acid on some date palm c.v Khastawi yield traits

The study was conducted at the Ishaqi palm plant affiliated with the Department of Horticulture/Ministry of Agriculture during the growing season of 2021 on date palm trees of the Khastawi variety to study the response of the yield traits of the Khastawi date palm trees to the injection of microelements, jasmonic and citric acid. The study included three factors: The first factor is the injection of microelements with three treatments: injection with water only, symbolized by D0, iron injection at a concentration of 300 mg, and iron sulfate. Palm1 , symbolized by D1, and boron injection through boric acid at a concentration of 40 mg Palm-1 , symbolized by D2. The second factor is the treatment of injections with the Jasmonic growth regulator, which was injected three days after the injection with the microelements and with the same number of additions (0, 50, 100) micrograms. L-1 is symbolized by G0, G1, and G2 sequentially. The trees were injected with the microelements and the Jasmonic growth regulator before Immunization, after vaccination in 20 days, and after 40 days. The third factor was injection with citric acid and included three levels (0, 500, 1000) mg l-1 symbolized by S0, S1, and S2 sequentially. The results showed that the D2 treatment was significantly superior in the average diameter, length, size and weight of the fruit and the total yield, as it reached 24.86 mm, 3.46 cm, 11.10 cm, 10.07 g, 36.00 kg.palm-1 sequentially, while the comparison treatment gave the lowest average for the traits. As for the effect of jasmonic acid, the injection treatment was superior to (100 µg L-1 ). (G2) gave the highest average for the diameter, length, size, weight of the fruit, and the total yield, which reached 25.90 mm, 3.63 cm, 12.09 cm, 10.93 g, and 35.96 kg. Palm-1, respectively, while the comparison treatment gave the lowest average for the traits above as for the effect of citric acid. The treatment exceeded 1000 mg.L-1 (S2) gave the highest rate in the diameter, length, size, and weight of the fruit, and the total yield, reaching 24.84 mm, 3.49 cm, 11.13 cm, 9.04 g, and 36.30 kg. Palm-1, respectively, while the comparison treatment gave the lowest average for the traits above, as the two- and three-interactions showed. The research factors have significant differences for all the studied traits. Keywords: Trace elements, jasmonic acid, citric acid, Khastawi variety.