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This project was carried out for two years in order to determine the best date for planting and harvesting fodder beet according to weather conditions, yield and crop rotation in the regions of Karaj, Khorasan Razavi, Qazvin and Lorestan. This project was done in the form of split plots in the form of randomized complete blocks and in Karaj and Qazvin regions with 6 replications in Mashhad region with 4 replications. The test related to Lorestan region was removed due to bad taste. This experiment had two factors, the first factor including two planting dates (the first level of cultivation at the earliest opportunity in spring and the second level of cultivation in June or July (after dehydrating the grains in each region)) and the second factor including two harvest dates (October and It was November. The variety studied in this project was the Iranian Kara variety. In addition, simultaneously with the second fodder beet cultivation (June or July), fodder corn was also planted and a comparison was made in this regard. The examined traits included root yield, shoot yield, dry matter yield of root and shoot, and sugar percentage for fodder beet, as well as the approximate amount of water consumed in Karaj region. The results showed that in Karaj region, compared to fodder corn, root and total dry matter yield in the treatment of early planting date and late harvest date were 20.04 and 24.45 tons per hectare, respectively. Dry had 14.32 tons per hectare. The efficiency of water consumption of root dry matter and total dry matter in the treatment of early planting date and late harvest date was 1.83 and 2.24 kg per cubic meter of water consumption, respectively, and in the case of corn, the water consumption efficiency of production dry matter was 1.81 kg. It was per cubic meter of water consumption. In Mashhad region, the treatment of the first planting date and the second harvest date of fodder beet with root dry matter yield and total dry matter yield of 15.31 and 17.36 tons per hectare respectively had the highest yield among the treatments and in contrast to fodder corn with an average The yield of total dry matter was 13.41 tons per hectare. In the Qazvin region, among the investigated fodder beet treatments, the treatment of the first planting date and the second harvest date has the highest root dry matter yield (with 19.11 tons per hectare), the highest total dry matter yield (with 22.91 tons per hectare), the highest efficiency Water consumption of root dry matter and total dry matter (respectively with 1.67 and 2.01 kg of dry matter per cubic meter of water consumed) and fodder corn with an average yield of total dry matter of 12.60 tons per hectare and Water consumption efficiency of 1.66 kg of root dry matter was comparable.
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