Silicon (Si) is considered a beneficial element for plant growth and is classified as a biostimulant or fertilizer, even though it is not an essential nutrient for plants. Silicon can alleviate calcium and phosphorous mild deficiency. When used effectively, silicon can enhance nutrients uptake, mitigate the effects of P and Ca deficiencies and improve productivity of peanut crop under Egyptian soil condition. Two field experiments were conducted at El-Bostan, Southern El-Tahrir, El-Behira Governorate, Egypt, during the summer seasons of 2019/2020 and 2020/2021 to investigate the impact of foliar silicon application at different rates on phosphorus and calcium utilization in sandy soil cultivated with peanut. The results showed a significant increase in available P and Ca in sandy soil, seed yield, and 100-seed weight with MAP application followed by SP treatment. Calcium sulfate (CaS) application led to a significant increase in seed N and Ca content. Increasing the rate of potassium silicate application from 0 to 500 ppm significantly gained the greatest increment of N, P, Si, and oil content in peanut seeds, as well as oil yield. However, silicon had no effect on Ca content in either seeds or straw. Additionally, the results declared that application of MAP Si500 increased seed and straw yield (ton/fed). Applied MAP with CaN resulted in the highest 100-seed weights under sandy soil conditions.