A field experiment was conducted in one of gypsum soil private farm in Al-Dour district during autumn season 2019. The study aims to show the effect spray potassium concentration of 0, 2000, 4000, 6000 mg l-1 on growth characters and NPK percentage in popcorn plants var Noor. The experiment was applied by using RCBD with three replicates. The results showed that corn plants which sprayed with 6000 mg l-1 gave the highest significant values in plant height 148.06 cm , leave area 4396.3 cm2, leave area index 4.47, leaves number 14.4, plant dry weight 134 g, NAR 0.001789 g cm-2 day-1, CGR 0.002275 gm day-1 and percentage of K, N, and P of 3.591, 1.9, and 0.424% respectively. There was no significant different between 4000 and 6000 mg l-1 treatments in all studied characters. Therefore the spraying of 4000 mg l-1 was useful to improve growth characters and popcorn plant content of NPK.

An experiment was carried out at the Department of Field Crops laboratory, College of Agriculture, University of Tikrit, in order to know the effect of stimulating the stored seeds of triticale  Farah cultivar by α -amylase enzyme  using a complete random design (CRD) in a factorial experiment. The first factor was the storage periods of  6 months, 1.5 years and 2.5 years (S1,S2 and S3) and the second factor was α -amylase enzyme concentrations of 0 (dry seeds), seeds soaked in distilled water, 1 and 2 mg L-1 of the enzyme (C1,C2,C3 and C4). Results showed that increasing the storage period reduces the viability of seeds and their ability to  germinate and seedling characters. The percentage of germination, plumule length, radicale, seedling vigor, plumule dry weight and radical dry weight reduced from 93.5%, 10.68 cm,11.05 cm, 2033.42, 0.1149 g and 0.1231 g in S1 treatment to 83.88%, 7.53cm, 7.5 cm, 1267.1, 0.0977 g and 0.1022 g in S3 treatment. The concentration 1 mg L-1 was superior in germination, plumule length, seedling vigor and plumule dry weight and the values were 92.44, 9.46cm, 1805.78 and 0.1111 g. However the concentration of 2 mg L-1 was superior in radical length and its dry weight. The best interaction was between storage period S1 and enzyme concentration C3 with values of 96.6%, 11.50 cm, 2212.33 and 0.1288 g for germination percentage, plumule length, seedling vigor and plumule dry weight and with the concentration C4 that recorded 11.67 cm and 0.1353 g for radical length and dry weight respectively.

A field experiment was carried out at the Research Station of the Field Crops Department - College of Agriculture - Tikrit University for the season 2021-2022. The experiment aimed to test the stimulating efficiency of stored triticale seed (Farah variety) by using water and alpha-amylase (α-amylase) enzyme. The experiment was carried out using a split plots arrangement, and the treatments were distributed according to a randomized complete block design in three replications. The main plots contained seed storage treatments for 6 months, 1.5, and 2.5 years, and the subplots treatments included seed stimulation treatments with distilled water, and concentrations of 1 and 2 mg L-1 in addition to the control treatment (dry seeds). The results showed a significant decrease in the percentage of emergence, crop growth rate (CGR), net assimilation rate (NAR), biological yield, and harvest index by increasing the storage period which did not affect the chlorophyll index in leaves significantly. Stimulation with the concentration of 1 mg L-1 recorded the best improvement in the characteristics of emergence percentage (88.77%), crop growth rate (0.02395 gm day-1), and harvest index (38.80 %). Stimulated seeds with a concentration of 2 mg L-1 gave the highest biological yield of 15.108 tons ha-1. However, it did not differ significantly from the stimulation treatment of 1 mg L-1. Stimulation factors did not affect the net assimilation rate and chlorophyll index. The interaction between factors was not significant according to the analysis of variance with the exception of the trait of biological yield, and the best interaction was between storage treatment for 6 months and concentration of 1 mg L-1 in most of the traits under study.