The Role of Iron Nanoparticles and Humic Acid in Iron Concentration, Growth and Yield of Broccoli (Brassica Oleracea var Italic)

Abstract

A field experiment was carried out in one of the private farms in Fallujah district, west of Baghdad for the autumn season 2020/2021 in a sandy mixture soil to study the effect of adding humic acid and nano iron on iron availability, growth and yield of broccoli plant to show the effect of the method of adding humic acid at three levels of 0, 50 and 100 kg. h-1 and its interaction with the addition of source and iron level at levels without addition (0 mg L-1, 50 mg L-1 nano iron and 100 mg L-1 metallic iron in some growth and production traits of broccoli plant using a complete randomized block design for a factorial experiment with three replicates and the results were analyzed Statistically at the 0.05 probability level to test for the least significant difference, the results of the study showed that the addition of humic acid caused significant increases compared to the control treatment in the studied traits, the highest average in the traits (number of leaves, leaf area, total plant yield, root weight, root length, iron concentration In leaves) it was 17.89 leaf-1, 362.5 cm2 plant-1, 19.81 Mg h-1, 81.0 g, 45.1 cm, 16.65 mg kg-1, respectively. The treatments of iron spray formulas and concentrations also significantly affected by increasing most of the above characteristics and the superiority of spraying nano iron at a concentration of 50 mg L-1) in (plant height, number of leaves, leaf area, total plant yield, root weight, root length, iron concentration in leaves) reached 40.56 cm, 19.22 leaf. plant-1, 426.4 cm2 plant-1, 26.06 mg/kg H-1, 80.76 gm, 46.0 cm2, 19.12 mg kg-1, sequentially. The effect of the interaction between the two factors of the study was significant, and the combination of adding humic acid combined with spraying nano iron at a concentration of 50 mg L-1) excelled in the traits (number of leaves, leaf area, iron concentration in leaves, total plant yield) which amounted to .20.31 leaf. plant-1, 503.4 cm2 plant -1, 20.79 mg kg -1, 29.83 mg h-1, sequentially.