Effect of Irrigation Intervals and Planting Patterns on Yield and Qualitative Traits of Forage Sorghum

In order to study the effect of irrigation intervals and planting pattern on the yield, yield components and qualitative traits of forage sorghum (Speedfeed variety) was conducted an experiment in Research Field of Islamic Azad University, Birjand, Iran in 2006. The experimental design was split plot in form RCBD with three replications and with 4 levels of irrigation interval (5, 10, 15 and 20 days) as main plots and 2 levels of planting pattern (one row above the furrow and two rows into the furrow) as sub plots. The irrigation intervals had a significant effect on the yield and yield components of forage sorghum but the planting pattern and the interaction of the irrigation intervals × planting pattern had no significant effect on these traits. The increase in irrigation interval from 5 to 20 days decreased the weight of the dry leaf, stem, ear and total fresh weight (sum of two cuttings) by 57.2, 72.1, 69 and 66.9 percent, respectively. The total dry forage in 5 days irrigation interval was 16.9 ton/ha which in comparison to 10, 15 and 20 days irrigation intervals advanced by 19.4, 44.3 and 66 percent, respectively. The irrigation intervals had a significant effect on the leaf to stem ratio and protein yield (sum of two cuttings). The comparison of mentioned traits averages in this experiment showed that with the increase of irrigation intervals, the leaf to stem ratio increased but protein yield decreased, significantly. The yield of crude protein with the increase of irrigation interval from 5 to 20 days decreased by 66.5 percent. The result of this research showed that water stress had negative effect on forage production and qualitative traits but planting pattern had not significant effect on these traits. Key word: forage sorghum, irrigation intervals, planting pattern, yield, qualitative traits.

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