Keywords : Maize
journal of kerbala university,
Volume 13, Issue 1, Pages 171-177
A field experiment was carried out during the autumn season of 2015 in Abu Gharaq area, (10 km west of the Hillah city) to study the response of four maize genotypes to nitrogen fertilizer levels as whole or split application. Factorial experiment was carried out in split plot arrangement within randomized complete block design (RCBD) with three replications . Four genotypes of maize (US hybrid , Hispanic hybrid , Euphrates hybrid and popcorn ) put insub-plot and main main-plot included nitrogen fertilizer (urea 46%N) in five treatments (0 , 100 kg N.ha-1as whole or split application , 200 kg N.ha-1as whole or split application) . Maize genotype were differ significantly in most of the traits , popcorn was superior in plant height (186.03 cm), number of leaves (16.22 ) ,plant leaf area (6671 cm 2) , leaf area index (3.55). American hybrid was superior in stem diameter (15.07 mm) .Nitrogen fertilizer treatments were differ in their effect , in which 100 kg application as one timewas superior in plant height (161.05 cm). Nitrogen fertilizer treatments did not differ in number of leaves , leaf area , leaf area index, stem diameter , days number to 50% female flowering. The interaction between popcorn (surur var.) with the addition of 200 kg N.ha-1(as split application in two parts) in plant height (191.33 cm) and leaf area (6805 cm 2). And the same genotype with 100 kg N.ha-1(as whole) in the number of leaves (16.66) and leaf area index (3.7). American hybrid interaction with the addition of 200 kg N.ha-1(as split in two parts)was superior in stem diameter (15.40 mm).
journal of kerbala university,
Volume 12, Issue 0, Pages 56-64
A field experiment was carried out at the center of training agricultural Al-mahanawia Babil during spring and autumn seasons of 2014 to study the effect of the plant density and ethyphon concentration in growth and grians yield of corn soil The experiment was done with factorial experiment arrangement by ( RCBD) the first factor was agriculture density between the rows ( 40 , 55 ,70)cm . The second factor was the concentrations' of ethyphon (0 - 280-420 - 560 ) gram/he . The results reveeled a significant differences among the plant density and ethyphon concentration for all study traits the density between rows (70)cm by giving high value for leaf area (0.317,0.460)m2 and at 500 grain weigh (136.39,161,72)g for both seasons spring and autumn respectively .while the number of grain /ear trait the density between the rows (55)was succeeded by giving high rang (579)grain/ear for spring season .in other hand the density between rows (40)cm was succeeded by giving high rang (645) grain /ear at autumn season. but the density between rows (70)cm was succeeded at the grain yield trait(263.26,267.10)g for both season spring and autumn sequentially .when the protein ratio ,the same density between rows was succeeded by giving a high rang (9.33,10.12)%for both season spring and autumn sequentially. while the level of ethyphon (0)g/he level gave high ranges for the flowing traits:-leaf area,500 grain weight,number of grain/ear,grain yield, protein ratio of grains. (0.390,0.426)m2,(138,67,163.14)g , (571.60,640.0) grain/ear (260.09,266.50)g and(9.0,9.88)%for both season spring and autumn sequentially.the interference between the density and the ethyphon levels was significant for traits:leaf area,500 grain weight,grain yield,but the difference were no significant for both traits:number of grains/ear and protien ratio in grains.