The study aimed to improve nitrogen uptake and protein yield in lentil crops grown in dry land conditions in Iran. Researchers tested the effects of different levels of potassium and nitrogen on lentil plants. They found that applying 60 kg ha-1 of potassium led to the highest seed nitrogen and protein content. Using 50 kg ha-1 of nitrogen increased plant growth and seed yield. The local lentil cultivar performed better in certain traits like plant height and seed quality, while another cultivar had more lateral branches and filled pods. The best results were seen when the local cultivar was treated with 60 kg ha-1 of potassium and 50 kg ha-1 of nitrogen, resulting in significantly higher nitrogen and protein levels compared to untreated plants.