This document provides information on seed technology and seed production of various crops. It begins with definitions of seed and seed technology. It then discusses causes of variety deterioration and methods to control deterioration. Principles of foundation and certified seed production are outlined. Detailed information is provided on seed production methods for various crops including wheat, rice, maize, sorghum, bajra, potato, tomato, chilies, berseem and lucerne. Key steps discussed include source of seed, field selection, isolation distances, sowing methods, fertilizer use, irrigation, plant protection, rouging, and harvesting.