Effect of fertilizing with boron and spraying with tyrosine on the growth and yield of two cultivars of Beetroot

The experiment was carried out in one of the fields belonging to the Department of Horticulture and Landscape Engineering, College of Agriculture, University of Kerbala, Al-Hasaniyya district, on 3/10/ 2023, which is located within latitude 32° north and longitude 44° east in mixed soil. The experiment was implemented according to a randomized complete block design (R.C.B.D) in the order of working experiments and with three replications. The first factor included two cultivars of beetroot (Local cultivar and Keshtzar cultivar). While the second factor included 9 fertilizer treatments (control, adding boron at a level of 10 kg ha-1, adding boron at a level of 20 kg ha-1, spraying tyrosine at a concentration of 100 mg L-1, spraying tyrosine at a concentration of 150 mg L-1, adding boron at a level of 10 kg ha-1 + spraying tyrosine at a concentration of 100 mg L-1, adding boron at a level of 10 kg ha-1 + spraying tyrosine at a concentration of 150 mg L-1, adding boron at a level of 20 kg ha-1 + spraying tyrosine at a concentration of 100 mg L-1, boron addition at a level of 20 kg ha-1 + spraying of tyrosine at a concentration of 150 mg L-1), they are indicated by symbols (T1, T2, T3, T4, T5, T6, T7, T8 and T9). The results showed that the T9 treatment (boron addition at a level of 20 kg ha-1 + spraying of tyrosine at a concentration of 150 mg L-1) was superior in leaf content of nitrogen, phosphorus, potassium and boron, with averages of (2.770%, 0.5533%, 2.3800% and 41.50 mg kg-1), respectively. The same treatment also excelled in plant height, leaf area, root weight and yield marketing averages of (48.908 cm, 180.90 cm2, 275.8 g plant-1 and 45.34 ton ha-1), respectively. The results also showed that the local variety excelled in the aforementioned traits with averages of (2.071%, 0.3926%, 1.6244%, 30.91 mg kg-1, 53.447 cm, 194.29 cm2, 342.2 g plant-1 and 55.94 ton ha-1). As for the interaction between the factors, it was significant in all the characteristics under study.