THE EFFECT OF DEFICIT IRRIGATION ON YIELD AND YIELD COMPONENTS OF THREE FORAGE SORGHUM VARIETIES

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RAHNEMA A.; ABSALAN SH.A.; MAKVANDI M.A.

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Journal: JOURNAL OF RESEARCH IN CROP SCIENCES Year:2009 | Volume:2 | Issue:2 Page(s): 11-23

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Title

THE EFFECT OF DEFICIT IRRIGATION ON YIELD AND YIELD COMPONENTS OF THREE FORAGE SORGHUM VARIETIES

Author(s)

RAHNEMA A. | ABSALAN SH.A. | MAKVANDI M.A. | Issue Writer Certificate

Keywords

FORAGE SORGHUMQ3

WATER DEFICITQ2

YIELDQ2

Abstract

In order to assess the deficit irrigation effect on sorghum forage YIELD, an experiment, was carried out in two years (2006 and 2007) in Khuzestan Agriculture and Natural resources research center, by split plot based on randomized complete block design with three replications. Treatments included four full irrigation levels, 85, 70 and 55 percent in main plot and three sorghum varieties speed feed, KFS2, KFS4 as sub plots. Results of variance analyses of raw numbers showed that there were significant differences at 1 percent level between irrigational treatments for all factors. The reduction of irrigation form full to 85, 70 and 55 percent, caused the plant height to reduce to 49.4 centimeter, till per plant to 1.8 number, 3.8 leaf area index, leaf rate stem to 0.9 percent, even fresh and dry ton per hectare were also reduced. Speed feed variety with 89.5 mean stem elongation and 2.2 percent leaf ratio to stem was the best cultivar in the group and that KFS2 was the next best variety in other group. Irrigation and varieties of interaction also had significant difference, in 5% and 1% level for fresh and dry YIELD. As soon as irrigation was reduced, the YIELD was also reduced and in all irrigation levels speed feed variety was superior. Finally speed feed variety with 70 to 85 percent rather than full irrigation was recommended if there were water limitation.

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