The Role of Fragmentation of Plant Densities in The Growth and Yield of Three Varieties of Soybean Glycine max L.


The experiment was carried out using three varieties of soybean (Lee74, Taqa and Aeman), cultivated at six plant densities (285714, 200000, 153846, 142857 and 100000 and 76923 plants . ha-1) using the Randomized Complete Block Design in the two regions,( Bany Maqan and Kani panka) belonging to the province of Sulaymaniyah in northern Iraq. The results showed in Bany Maqan , Taqa variety was superior in plant yield and the total yield (19.19 g . plant-1 and 2963.9 kg) respectively, in addition to the number of vegetative branches and the number of pods. plant-1. Lee74 was superior in flowering characteristics, plant height, number of seeds and percentage of oil, while Aeman exceeded, seed index and protein ratio. For the Kani Banka site, Lee74 was superior in number of days till flowering, plant height, , number of branches, plant yield(16.13 g . plant-1) , total yield (2574.2 kg.ha-1) and protein ratio. The results of the plant densities test showed plant density (200000 plants . ha-1) superior in plant yield and total yield . The interactions of varieties and plant density showed (200000 plant . ha-1 ) , and Taqa cultivar regarding total yield and plant yield in Bani maqan site was superior , but in Kani panka the interaction of Lee 74 with density ( 200000 plant . ha-1) was superior for same above characteristics.