Role of NPK, root stimulator and Nano micronutrients on growth of Citrus Rootstock Rangpur.

The experiment was carried out at a Research Station B / Department of Horticulture and Landscape Gardening/ College of Agricultural Engineering Sciences / University of Baghdad during the growth season 2022-2021 on the seedlings of citrus rootstock Rangpur, seedlings were chosen homogeneous in size as much as possible to study the effect of three factors, The first factor is fertilization with balanced NPK in three concentrations, without addition (F0), 2 gm. seedlings-1 (F1) and 4gm seedlings-1 ( F2) The second factor is the root stimulator with three concentrations, which is without addition ( R0)5 ml L-1 (R1), and 10 ml L-1 (R2). The third factor is spraying with two concentrations of Nano-micronutrients without spraying,( N0), with spraying 1 gm L-1 (N1). A factorial experiment in a randomized complete block design (RCBD) was carried out, (3 concentrations of NPK x 3 concentrations of Root stimulator x 2 concentrations of Nano-micronutrients) with 3 replicates, and 3 plants in an experimental unit, So that the number of seedlings included in the experiment was 162 seedlings. NPK fertilization showed that there were significant differences in increasing the rates for studied traits, where the concentration (4gm seedlings-1) shows that there were significant differences in plant height, the main stem diameter, Leaves number, leaf area, dry matter percentage of the shoot and chlorophyll concentration values were (46.33 cm, 3.283 mm, 107.06 leaf plant -1, 32.57 cm2, 53.22 gm, 2.37 mg gm-1) respectively. As for the root stimulator, the concentration (10 ml L-1) showed that there were significant differences in plant height, Leaves number, leaf area, the main stem diameter, dry matter percentage of the shoot, and chlorophyll concentration, values were (49.50 cm,30.28 leaf plant -1,31.99 cm 2,3.433mm, 54.67g,2.33 mg gm-1) respectively. The Spraying with Nano-micronutrients with concentration 1g L-1 showed the highest rates in plant height, leaf area, main stem diameter, dry matter percentage of shoot, and chlorophyll concentration, values were (44.37 cm, 31.31 cm2, 3.037 mm, 50.96 g, 2.29 mg gm-1) respectively compared to other treatments.