Evaluating wheat seed production quality according to noxious weeds, other cultivars, and other crops in Tehran and Alborz provinces

To evaluate the quality of fields and seed plots in two wheat seed production companies in Tehran (1) and Alborz (2) provinces. The experiment was conducted in 2018-2019 on Sirwan, Baharan, Sivand, Pishtaz, Rakhshan, Pishgam, and Persian gold cultivars at Seed and plant Certification and Registration Research Institute according to PROJECT NO: 2-08-08-021-971216. The distribution of noxious weeds, other crops, and other species in fields was recorded. Also, seed samples were analyzed in a seed quality analysis laboratory for seed germination percent and physical purity. The results showed that the fields of company 2 were better than company 1. As a result, the number of other crops in fields of companies 2 and 1 were observed at 1.1 and 2.2, respectively. Also, the number of other species in fields was recorded for companies 2 and 1, 9.1 and 9.9, respectively. The most weeds that have been observed in fields and seed samples were Avena fatua L. In addition, 66.1% and 39.2% of total Avena fatua L. were related to companies 1 and 2, respectively. Meanwhile, according to the estimated seed sample for the number of noxious weeds and other crops before processing, seed production of company 2 was better than company 1. Also, wheat seed yields for the two companies were recorded at 5.0 and 4.6 tons per hectare, respectively. The physical purity was 99.6% in the two companies, but the normal seedling of companies 2 and 1 was 93.9% and  93.6%, respectively.