RESPONSE OF NUMBER OF CORN GENOTYPES TO DIFFERENT LEVELS OF NITROGEN UNDER AL-ANBAR CONDITIONS

Abstract

This experiment has been done in the field of Agriculture college AI-Anbar University during spring and Autumn seasons of 2000.The aim of this study is to know the response of some of hybridize genetic structure, cultivators structure and pure races of Zeamays L. to different levels of nitrogen fertilizer (320,240,160) kg N/ha. And its effect in yield and its components, and the importance of growth characteristics in the studied genetic structure. In this experiment the system of furrowed lines is used according to Randum complete Block Design ( R.C.B.D.) fertilizer levels have taken the primary lines while genetic structure have taken the secondary lines. During studying the results and analysis them the following appeared: increasing in nitrogen fertilizer significantly indicated in all the significant studied characteristics. The increasing in nitrogen leads to early male and female flowering and increasing in plant height, ear length and its number in the plant, ear length and the number of the seeds lines inside it, number of seeds in one line, weight of 300 seeds, pure percentage protein percentage and seeds yield in plant. The quality of losing seeds and the quantity of oil in seeds have been decreased for spring and Autumn season respectively. The levels of nitrogen fertilizer do not have a significant effect upon the number of days from planting till % 75 appearance of the plant. The response of seeds yield to the increasing of nitrogen fertilizer levels have taken a liner figure and the most quantity of seeds have obtained from the fertilizer level 320 kgN/ha and amount (10.2,4.7) t/ha for the two seasons respectively. A significant effect has been founded in the genetic structure in all the studied characteristics for spring and Autumn seasons respectively. The single hybirdize lpa 2052 is prior than other genetic structure. It amounts the highest quantity of seeds yield which is 4.7 t/ha followed by the single hybridize spiro which amount 4.2 t/ha for spring season. While in Autumn season the single hybirdize amounts (spiro-440633) 11.8 t/ha of seeds followed by hybridize lpa 3001 which amounts 11.4 t/ha of seeds. The interference among genetic structure and nitrogen fertilizer have a significant effect in decreasing the period of male and female flowering , increasing in plant heightearlength, number of A earin plant, number of lines in ear, number of seeds, length of line, weight of 300 seeds, pure seeds percentage , protein percentage in seeds, seeds yield in plant. The percentage of losing seeds decreased, percentage of oil in seeds for spring and Autumn seasons respectively. The interference has a significant effect in the total of seeds yield with the single hybiridize amount (spiro-440633) under fertilizer level 320KgN/ha the highest rate of seeds amounts (14.8, 6.6 ) t/ha for spring and Autumn seasons respectively. There is no significant effect for the interference among genetic structure and fertilizer levels in the duration of famale flowering and duration of planting, ear length/cm for the two seasons respectively.