Do not make heavy applications of manure just before planting and do not use additional fertilizer as a sidedress. Fertilizer should be broadcast and disked in before planting. Date of Planting Sweet sorghum is a warm-season crop that matures earlier under high temperatures and short days. It tolerates drought and high-temperature stress better than many crops, but it does not grow well under low temperatures. Soil temperature at a depth of 2 inches should be 65 F or above for direct-seeded sorghum and 60 F for transplanted sorghum.
Late plantings grow more rapidly than early plantings.
However, when planted too late, plants may not mature before the first expected killing frost. Small areas of one acre or less can be seeded by hand or with a small garden seeder using the plate designed for carrot seed. For larger areas, corn planters with plates are best. Pre-punched plates that will seed at these low rates cannot be purchased. You can buy blank plates that fit your planter and drill holes for the size of your seed.