Effects of Different Salinity Levels in The Growing Medium on Germination and Seedling Growth of Canola (Brassica napus L.)

Document Type : Research Paper

Authors

1 Former Graduate Student, Tarbiat Modares University

2 Associate Professor, Tarbiat Modares University

Abstract

Saline soil and saline irrigation water presents potential hazards to Canola production. Germination is one of the most critical periods for a crop subjected to salinity, because plant establishment and survival are dependent on these phonologic stages. To investigate the effect of salinity on germination and seedling of Canola (Brassica napus L.) in a natural saline soil and to compare the germination process in natural and artificially made saline water (NaCl + CaCl2 solution), an experiment with three phases was conducted in completely randomized design with 12 saline treatment and 3 replicates in agricultural faculty of Tarbiat Modares University. Germination in the first two phases was in Petri dishes in an incubator and included a non-saline water treatment (Tap water) and 12 saline water treatment of 3 to 25 dS/m from two sources; natural saline water and NaCl + CaCl2 solution as a charge base. Germination in phase 3 was carried out in a greenhouse inputs containing natural saline soil, which was equilibrated with saline water having the same salinities. The germinated seeds were counted at the desired time intervals and continued until 3 continuous counting were identical. The percent of germinated seeds and germination rate were calculated and analyzed. The result indicated that germinated seeds and germination rate are decreased with salinity increasing. But this decrease in natural saline water was more than the NaCl + CaCl2 solution. Comparison of seed germination in soil and in incubator showed that the seed could germinate in all salinity treatment in incubator (in spite the decrease in germinated seeds and germination rate), but seed germination in soil was continued up to 11 dS/m. with time, seedling growth decreased with increasing salinity and sometimes was fully stopped. The seed could not germinate and grow in soil salinity more than 7 dS/m. also germination was observed in all saline treatments in the incubator, but seems it can tolerant salinity in germination stage up to 5 dS/m.

Keywords

References

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Iranian Journal of Soil Research
Volume 21, Issue 2
February 2008
Pages 209-218

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