Seed Yield of Various Genotypes of Sorghum (Sorghum bicolor [L.] Moench.) Harvested from Intercropping with Cassava (Manihot utilisima L.) Compared to Monoculture and Ratoon

Abstract.  Production of sorghum seeds (Sorghum bicolor [L.] Moench.) faces  land scarcity due to land use competition with other crops that have been cultivated by farmers since longer time ago such as soybean, peanuts, green bean, cowpea bean, and cassava. So, it have to do by using planting systems of intercropping and/or ratoon instead of monoculture.  The problem was what sorghum genotypes that are compatible to planting system of intercropping, monoculture, and ratoon.  The objective of this experiment was to evaluate the seed yield of various sorghum genotypes harvested from intercropping, monoculture, and ratoon planting systems.  A split-plot  experiment was conducted during March – November 2016 at the Village of Tulungagung, Sub District of Gadingrejo, Regency of Pringsewu, Lampung Province, Indonesia to reach that objective. Fifteen sorghum genotypes as subplots were placed randomly on three planting systems as main plot. It was replicated three times as three blocks. The seed yields observed were weight of thousand seeds (WTS), seed weight per plant (SWPP), seed number per plant (SNPP), and flowering day (FD). In general, the planting system did not affect significantly to seed yield, except on the flowering day. The genotypes affected significantly on weight of thousand seeds and the flowering day.  There was an interaction effect of planting systems and genotypes showed by seed weight per plant and flowering day.