Field experiments were conducted at the experimental station farm ofDesert Research Center (D.R.C.) at EL-Kharga Oasis, New Valley Governorate, during2018/ 2019 and 2019/ 2020 growing seasons, to study the effect of sowing dates and silicon foliar application on productivity of faba bean under New Valley conditions.Results revealed that number of pods plant^-1, seed yield plant^-1, 100 seed weight, harvest index, shelling and seed yield were higher with planting on 15^th Oct in both seasons. While, plant height, pod length, straw yield, WUE and seed carbohydrates content were higher with planting on 1^st Oct in both seasons. Raising silicon foliar application levels up to 300 ppm led to a significant increase in all studied parameters except, pod length in both seasons. The interaction between sowing dates and silicon foliar application levels had significant effects on all studied characters except, pod length. The highest values of yield and its components were performed when faba bean had sown on 15^th Oct with spraying of 300 ppm silicon in the form potassium silicate to obtain the highest possible productivity under New Valley conditions.