University of Tabriz Journal of Agricultural Mechanization 2383-126X 8 2 2023 06 22 Qualitative, technical and financial investigation of the use of different sieves on useful and useless losses of irrigated and dry wheat cultivars in some moderate climate provinces of the country Qualitative, technical and financial investigation of the use of different sieves on useful and useless losses of irrigated and dry wheat cultivars in some moderate climate provinces of the country 1 17 16735 10.22034/jam.2023.54695.1214 FA Hamid Reza Gazor Associate Professor of Agricultural Engineering Research Institute, Agricultural Research, Education and Extension Organization(AREEO ), Karaj, Iran Hormoz Asadi Assistant Professor in agricultural economic researches , Seed and Plant Improvement Institute(SPII), Agricultural Research, Education and Extension Organization (AREEO ), Karaj, Iran Fariba Nghipour Assistant Professor, Seed and Plant Improvement Institute(SPII), Agricultural Research, Education and Extension Organization(AREEO), Karaj, Iran Journal Article 2022 12 30 Determining the exact rate of wheat losses in wheat purchase centers is one of the concerns of the government to ensure farmers fair purchase of wheat. In this research, the performance of four types of separator sieves with 2×2, 2×20, 1.7×20 and 1.5×20 mm grids was studied for separation of impurities. The study was for qualitative, technical and financial investigation of irrigated and rain-fed wheat cultivars in Kermanshah, Fars and Semnan provinces with temperate climate. The results showed that in the case of the use of 2x20 mm sieve, the highest amount of protein and zeleny sedimentation volume was observed, although bakery properties changes, including grain hardness, were not significant. The samples sieved with 1.5 x 20 mm sieve had the lowest Falling number. The average useless loss for irrigated and rainfed wheat varieties were 1.55% and 1.61% and the average useful loss for wheat varieties with sieve meshes of 2×20, 1.7×20, 2×2 and 1.5×20 mm were 4.7%, 1.85%, 0.6% and 0.084%, respectively. By changing the separation sieve from mesh size of 2×2 mm to 2×20 and 1.7×20 mm, the useful loss rate increased and the financial value of purchased wheat in the purchase centers were coming down. Also, in the preliminary separation of impurities (e.g. weed seeds), 2×2 mm mesh sieve was more efficient than other sieves. Thus, the use of 2×2 mm mesh sieve to determine the useful loss of wheat in purchase centers can be useful and beneficial for farmers.  Determining the exact rate of wheat losses in wheat purchase centers is one of the concerns of the government to ensure farmers fair purchase of wheat. In this research, the performance of four types of separator sieves with 2×2, 2×20, 1.7×20 and 1.5×20 mm grids was studied for separation of impurities. The study was for qualitative, technical and financial investigation of irrigated and rain-fed wheat cultivars in Kermanshah, Fars and Semnan provinces with temperate climate. The results showed that in the case of the use of 2x20 mm sieve, the highest amount of protein and zeleny sedimentation volume was observed, although bakery properties changes, including grain hardness, were not significant. The samples sieved with 1.5 x 20 mm sieve had the lowest Falling number. The average useless loss for irrigated and rainfed wheat varieties were 1.55% and 1.61% and the average useful loss for wheat varieties with sieve meshes of 2×20, 1.7×20, 2×2 and 1.5×20 mm were 4.7%, 1.85%, 0.6% and 0.084%, respectively. By changing the separation sieve from mesh size of 2×2 mm to 2×20 and 1.7×20 mm, the useful loss rate increased and the financial value of purchased wheat in the purchase centers were coming down. Also, in the preliminary separation of impurities (e.g. weed seeds), 2×2 mm mesh sieve was more efficient than other sieves. Thus, the use of 2×2 mm mesh sieve to determine the useful loss of wheat in purchase centers can be useful and beneficial for farmers.  https://jam.tabrizu.ac.ir/article_16735_4af98f837098517c0c993cb0d949df38.pdf