Grain yield and nutrient and starch content of sorghum (Sorghum bicolor (L.) Moench) genotypes as affected by date of intercropping with cassava in Lampung, Indonesia
2014
Kamal, M. | Hadi, M.S. | Hariyanto, E. | Jumarko | Ashadi
Sorghum (Sorghum bicolor (L.) Moench) is one of the cereal crops utilized as source of food, feed and bioethanol production. Intercropping with cassava is a promising means of developing sorghum plants in Lampung province of Indonesia. However, little information on sorghum intercropped with cassava has been documented. The study sought to evaluate the effect of planting dates on grain yield and content N, P, K and seed starch of several sorghum genotypes intercropped with cassava. A field experiment was conducted in Waway Karya of East Lampung, Lampung Province-Indonesia in 2009-2010. The treatments were arranged factorially with split-plot in randomized block design with three replications. The main plot was planting dates consisting of three levels, that was, 0, 2 and 4 weeks after planting cassava. Sub-plot was sorghum genotypes including Kawali, Mandau, B-76 and B-92. Fertilizers used were urea, SP-36 and KCl. Sorghum plants intercropped with cassava and planted in interrows of cassava, while cassava was planted with row spacing at 2 and 4 weeks-after planting cassava resulted in lower grain yield and content of nutrient and seed starch compared to that planted at the same date of cassava planting. The highest reduction occurred at the planting date of 4 weeks after planting cassava, that was, 72.9% for sorghum grain yield. The reduction in N, P and K content of sorghum plants caused by 4-weeks delayed planting was 14.5, 26.7 and 41.9%, respectively, while the reduction of seed starch content was only 6.0%.
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