To have a high yield of alfalfa planted in autumn, it is necessary to ensure that the seeds germinate in a short period of time, and to create optimal conditions for the rapid growth of sprouts. Then the alfalfa grows up to 30 cm, takes root well, and becomes strong until the frost days. Until recently, low-yielding local varieties were planted in our republic, but now, as a result of scientific research in the field of alfalfa, a number of high-yielding, protein-rich, alfalfa varieties suitable for the conditions of each region have been established in comparison to local varieties. adapted varieties have been created. Alfalfa has a great agrotechnical and amelioration value, it is a good predecessor of most crops. The experiment consists of five variants and four iterations. During the experiment autumn was selected as a plantim time, and besides, 16kg/ha of seeds were sown in the field, where fertilizers at different level were applied in the various variant. The results showed that the highest yield was in the variants with Sila Silicon, accounted for 89-101.5 q/ha additional crop yield.