Different planting densities and fertilizer levels were tested on rapeseed to see how they affect nutrient absorption and seed yield. High fertilizer levels led to higher yields compared to low levels, with significant differences between treatments. The best results were seen with a combination of high fertilizer and low planting density. More fertilizer meant more nitrogen, phosphorus, and potassium in the plants, which matched the higher yields. Nitrogen and phosphorus levels were highest during flowering and harvesting, while potassium levels stayed more stable.