EFFECT OF SALINITY AND CROP RESIDUE ON SEED GERMINATION AND EARLY SEEDLING GROWTH OF CURLED DOCK (RUMEX CRISPUS L.)
|Rouhollah Amini*, Younes Bahmani, Esmaeil Amjadi and Zeinab Nazari
Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, 5166616471, Iran.
|Corresponding Author: RouhollahAmini, Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Iran. Tel: (+98)4113392051; Fax: (+98) 4113356003 Postal cod: 5166616471; E-mail: [email protected]|
|Received: 11 October 2014 Accepted: 02 November 2014|
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Curled dock (Rumex crispus L.) is a perennial weed species with a wide distribution in the rangelands and cropping systems in East-Azarbaijan, Iran. Tow experiments were carried out based on randomised complete block design with four replications in Tabriz, Iran in 2013 to evaluate the effects of salinity and crop residues on R. crispus germination and seedling growth. The salinity levels were included 0, 40, 80, 120, 160, 200 and 240 mM (millimolar) sodium chloride (NaCl). Different types of crop residues were canola, sunflower, corn and winter wheat plant residues. Results showed that the effect of salinity was significant on R. crispus germination (%), seedling length and dry matter. Increasing the salinity more than 40 mM reduced seed germination significantly in comparison with control. Increasing the salinity from 0 to 80 mm had no significant effect on seedling dry matter but higher than 80 mm, the dry matter decreased. Also the effect of crop residue type was significant on R. crispus germination (%) and seedling growth. The residue of winter wheat had no significant effect on R. crispus germination (%) and seedling dry matter but other crop residues significantly reduced the germination (%). The canola and sunflower residues indicated the highest germination inhibition among the crop residues. We can conclude that the residue of winter wheat had no significant effect on R. crispus germination and seedling growth but other types of the residues indicated inhibition effect on this weed species.