The Seed Production area (SPA) is defined as a phenotypically superior stand made up of vigorously growing healthy trees, upgraded by thinning to remove poorer phenotypes and treated and managed to cause abundant seed production. A 20 hectare seed stand of Acacia nilotica, planted in 1978 at 0-20 RD, Gharsana Distributory, Gharsana, Rajasthan was converted into seed production area after inter-comparing various other seed stands planted between 1975 to 1978 in Rajasthan state. Out of 3850 trees, 1350 plants have been culled and 2500 trees were retained after scoring each tree in the stand and ranking them in descending order. After culling the average height, clear bole, and girth diameter have been shifted towards the higher side by 0.44m, 0.58m, and 0.54cm respectively. Seeds collected after establishment of SPA showed improvement in seed weight and germination percentile.