Response of two cultivars of leek Allium ampeloprasum L. to mineral and biofertilizers, and putrescine spray in the growth and yield parameters


A study was carried out during the growing seasons (2012 - 2013) and (2014-2015) in an Alsahla area / Province of Najaf to study the effect of two varieties of leek (local and Syrian) of Leek. and three types of the fertilization, Azotobacter Was added at a rate of (20 Kg.h-1 ), Bio fertilizer (Effective Microorganism) ( EM1) was added at a rate of (16 L.h-1) and nitrogen fertilization (Urea) 46% which was fertilized at a rate of (240 Kg.h-1). In addition to the control treatment (without fertilization) and three concentrations of Bioregulator (Putrescine) (0.0, 75 and 150) mg.L-1. Experiment was adopted in Split split– Block Design with Randomized Complete Block Design(R.C.B.D) with three replicates, First (variety) setting in Main plot, Second (fertilization) setting in sub plots and Third (Putrescine) setting in sub-sub plots. Averages were compared by using the Least Significant Difference ( L.S.D ) test at probability level 0.05. Results showed that cultivars or fertilization treatments or spraying with Putrescine had a significant effect on growth parameters (plant height, fresh and dry weight of plant, fresh and dry yield per unit area, dry weight of root, leaves content of total chlorophyll. The local cultivars gave the largest fresh weight ( 10.20 and 7.12) g.plant-1 and the largest fresh yield per unit area i.e. ( 4.00 and 2.84) T.ha-1 compared with Syrian cultivars which gave the lowest vulvas for both seasons respectively, also treated with Azotobacter gave significant increasing in fresh weight (11.26 and 7.46) g.plant-1 and fresh yield per unit area to ( 4.50 and 2.98) T.ha-1 compared with control treatment (non- fertilized plants) in the first season and fertilization with EMI in the second season which gave the lowest vulvas, spraying plants with Putrescine at a concentration 75 mg.L-1 gave significant increasing in dry weight i.e. ( 1.17 and 0.77) g.plant-1 and the largest fresh yield per unit area i.e. ( 0.467 and 0.309) T.ha-1 compared with plant spraying with distilled water( control) which gave the lowest vulvas for both season respectively.