Keywords : Ear

Estimation several genetic parameters for corn ear characters

F. Y; Baktash; Nadhem; Y.A

ANBAR JOURNAL OF AGRICULTURAL SCIENCES, 2016, Volume 14, Issue 1, Pages 103-127

A field trails were conducted at the experimental field of Crops Science Department, College of Agriculture, University of Baghdad during spring and fall seasons of 2004 and spring season of 2005. The objective of this research was to evaluate daillel crosses developed from 10 inbred lines , Bk26, Bk43, Bk25, Bk39, Bk3, Bk41, Bk65, Bk16, Bk55 and Bk11 (recommended from last research) and estimate several genetic parameters for corn (Zea mays L) ear characters. Inbred lines propagated and full diallel crosses carried out. Varietal trails were conducted using Latice Design with four replications to evaluate single crosses , their reciprocals and parents in fall season 2004 and spring 2005 .The diallel crosses Bk25xBk55, Bk55xBk26, Bk39xBk3,Bk65xBk55 and reciprocal cross Bk16xBk41 in fall season and Bk16xBk55, Bk3xBk16 and reciprocal crosses Bk39xBk65, Bk65xBk3 in spring season superior in ear length . Several daillel crosses and reciprocals produced plants with higher number /ear and number of grains /ear, in both seasons. The highest number of grains/ear produced from daillel cross Bk26xBk25 and reciprocal Bk39xBk25 in fall season and daillel cross Bk43xBk55, reciprocals Bk3xBk41, Bk3xBk25, in spring season. Several crosses superiored in grain weight. The results showed importance of cytoplasmic effects and significance of general and specific combining ability in all the studied traits. The average degree of dominance more than one for daillel and reciprocal crosses in both seasons. All the studied traits under non-additive gene action.

Response of Maize to Potassium fertilizer and Boron leaves nutrition

B. H. A. AL-Dulami; N. D. H. AL-Hadethi

ANBAR JOURNAL OF AGRICULTURAL SCIENCES, 2015, Volume 13, Issue 1, Pages 213-225
DOI: 10.32649/ajas.2015.120020

The field experiment was carried out in the spring and autumn season of 2012 in the city of Ramadi , Anbar province in loam clay silty soil texture in order to study the effects of three concentrations of boron (0, 0.75, 1.5) KgB.ha-1 was added as foliar application in the form of boric acid H3BO3(17.4%B) and three levels of potassium fertilizer (0, 100, 200) KgK.ha-1 of potassium sulfate K2SO4 (45%K) as its source in the growth and productivity of two genotypes of maize (IPA 5018 and Bohoth 106). The experiment split-split plot with R.C.B.D. design was used with three replications.
The results of this study were:
The IPA genotype had significant superior in grains number per ear, grains yield, biological yield and harvest index, the increase percentage as average of two season was 11.35, 14.97, 12.02 and 4.41% respectively compared to Bohoth genotype, which was superior in leaf area. The highest Level of potassium (200KgK.ha-1) had significant superior in leaf area, number of grains per ear, grains yield, biological yield and harvest index, the increase percentage as average of two season were 12.74, 48.75, 57.81, 39.67 and 14.28% compared to control treatment, which gave the lowest mean for this characters respectively.
Foliar application with high concentration of boron (1.5Kg B.ha-1) gave significant increase in all studied characters. The grain yield at this concentration was 10.32 and 12.43 ton.ha-1 compared to control treatment (6.48 , 7.86) ton.ha-1 of the two seasons respectively .The triple interaction of IPA genotype with highest level of both fertilizers (200Kg K+1.5Kg B).ha-1 gave the highest average of leaf area , grains number per ear , grains yield (12.80 , 14.72) ton . ha-1, biological yield and harvest index (56.82 , 56.42)% in both seasons respectively. It can be concluded that the IPA5018 genotype was more responsive for application of nutrients as it gave highest average for studied characteristics especially in high levels in both seasons.