Abstract

The experiment was carried out in Anbar province during the two winter seasons 2016 -2017 and 2017-2018. For study the effect of plant spaces between plants and levels of thiamine on the growth and yield of four genotypes of faba bean using randomized complete block design in split-split plots system with three replicates. The study included four concentrations of thiamine 0, 50, 100 and 150 mg.L-1 in the main experimental units and two planting spaces between the plants 25 and 35 cm. in the split plots and four genotypes of the faba bean: are American Sakis, Turkish Ecuadichi, Dutch Aquadulce and Italian Ackerbhone ,distributed in split split plots. The results showed a clear effect of the spraying of thiamin in most of the studied traits, the concentrations of 50 mg L-1 showed the highest mean of net photosynthesis 3.76 gm-2 leaves, day-1 and 4.37 g for the first season and number of pods and protein 6.050 pod plant-1 and 25.82 % for the second season. With regard to genotypes, the American achieved the highest mean for most traits of growth and yield and qualitative traits, such as net photosynthesis 4.12 gm m-2 day-1 for the first season only, plant height 57.38 cm, protein 23.77% for the second season only, number of pods and number of seeds 11.37, 6.80 pod plant-1, 3.80 and 3.84 seeds pod-1 for the two seasons. The space 35 cm between plants surpassed in most traits, such as protein percentage 24.03 % for the first season and net photosynthesis 3.09 gm .m-2 leaves, day-1 for the second season and the number of pods 10.77 and 6.24 pods. plant-1 for both seasons. The Turkish genotype at the planting displace 35 cm achieved higher mean of number of pods and protein ratio 12.93 pods plant-1 and 24.95% for the first season respectively. As for the combination of the genotypes and the concentrations of thiamine, the American genotype was achieved with a concentration of 50 mg L-1 the highest mean of net photosynthesis (4.28 gm.m-2 leaves.day-1 for the first season ,plant height and number of pods 78.50 cm and 7.77 pod plant-1 for the second season respectively. The planting space 35 cm with a concentration of 100 mg L-1 of thiamin was achieved the highest mean for both net photosynthesis and number of seeds 4.02 and 3.30 gm m-2 leaves day-1 and 3.92 and 4.07 seed plants-1 for the two seasons thiamine in most of the studied traits. As for the genotypes, the American genotype gave respectively.