هيام حمزة عيسى السلامي

A field experiment was conducted in Faculty of Agriculture, University of Kufa fields in a silty-clay soil during 2019-2020 seasons to study the effect of integrated fertilization, genetic varieties and irrigation periods on yield and growth of yellow corn. RCBD designed was used distribute treatments randomly in a factorial experiment. The first factor was the complete recommended dose of integrated fertilizer (N 300kg.h-1, P 80kg.h-1and K 80kg.h-1) as A1, half recommended dose of integrated fertilizer with bacterial fertilizer (Azospirillum, Azotobacter) and organic fertilization at 4 ton.h-1 as A2 and half recommended dose of integrated fertilizer with fungal fertilizer (Trichoderma harzianum Rifai) with organic fertilization at 4 ton.h-1 as A3. The second and third factors were the genetic varieties of yellow corn (Sara, 5018) as B1, B2 and irrigation periods of 7, 10 and 14 days as a C1, C2 and C3 respectively. Results showed that there was significant effect of integrated fertilization, genetic varieties, irrigation periods and their interactions on the increasing the readiness of some nutrients in soil and the content of these nutrients in plant which led to increase growth and yield. A2 treatment was exceled A1 significantly in plant height, chlorophyll concentration, leaf area, dry weight, the weight of 500 grain, the average of grain number in each cob corn and grain yield (3.88, 15.5, 18.30, 22.64, 10.28, 30.66 and 8.14% respectively). Results also showed that the 5018 genetic variety was exceled Sara variety in some studied traits (plant height, chlorophyll concentration, leaf area and grain yield) by 2.98, 11.5, 3.27 and 5.30% respectively. The different time period of irrigation was affected the readiness of N, P and K elements in soil and plant when 7 day period was exceled 10 and 14 day periods and decreased nitrogen, phosphorous and potassium concentration in soil by 5.35, 10.48%, 19.66, 38.66%, 6.50 and 10.52% respectively and by 39.67, 14.05%, 4.92, 10.36%, 8.08, 16.89% in plant leafs respectively. The interaction treatment between A2, B2 and C1 was exceled A1, B1 and C3 treatment and increase the average of plant height, leaf area, dry weight and grain yield by 17.68, 47.61, 80.89 and 24.49% respectively.