The Combined Effect of Bio-Fertilizers, Coconut Endosperm Fluid and Amino Acids Tryptophan on the Vegetative Growth Characteristics of Cumin (Cuminum cyminum L.)

Abstract

This study was carried out in the field during the two winter seasons (2020-2019) and (2021-2020) in the experimental field of the College of Agricultural Engineering Sciences-University of Baghdad (Al-Jadriya), with the aim of improving the efficiency and productivity of the vegetative growth characteristics of cumin (Turkish variety) under the influence of Iraqi conditions. The experiment included a two-factor study, the first with four levels of biofertilizers (without vaccine, Pseudomonas fluorescens, Azospirillum brasilense and the mixture between the two fertilizers), and the second with a combination of five levels that included two treatments (15 and 30 ml L-1) each of coconut endosperm fluid and tryptophan with One metering treatment for both (spray with distilled water only). The experiment was carried out by arranging the split panels according to a randomized complete block design with three replications. The results of the study showed the superiority of plants treated with the spray combination (30 ml-1 each) in the presence of the mixture between the two fertilizers in the height of the main stem (27.53 and 29.33 cm), the number of main branches (9.13 and 9.67 plant branches-1) and the dry weight of the vegetative (9.99 and 9.99 9.96 g plant-1), fresh weight of the vegetative (20.55 and 43.95 g plant-1), relative growth rate (0.044 and 0.050 g-1 day-1), crop growth rate (1.903 and 2.292 g m2 day-1) and leaves of total chlorophyll (0.052 and 0.047 mg 100 g-2 of fresh weight) compared to uncontaminated and unsprayed plants for both seasons, respectively.