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Abstract
Growth and some growth characteristics of a forage sorghum hybrid (Sudax SX-6) in irrigated and unirrigated soil were studied in the field. Final dry weights 16 weeks after sowing were 36.8 g per plant with irrigation and 28.2 g per plant without. Except for the dead matter component, which was significantly higher without irrigation, all other yield components (leaf laminae, leaf sheath, stem tissues, and seedhead) were similar in both treatments. Under irrigation, leaf laminae and sheath components decreased from 96% at week 6 (from sowing) to 21% at week 16, and stem tissues increased from 4% to 71% over the same period. Seedhead reached about 7% of final dry weight. Percentage dry matter (%DM) of the unirrigated plants was higher (1–5%) than that of the irrigated plants. Final total plant %DM was 31%. Rapid stem elongation was recorded between week 8 and week 13, averaging 5 cm per day in the irrigated plants. Nitrogen levels in each of the components were similar for both soil moisture regimes.
