Investigation the effect of humic acid on canola germination traits in salinity conditions

Salinity stress is one of the most important abiotic factors which considerably reduces the yield of agricultural products. As a result, farmers tend to use chemical fertilizers to reduce the effects of salinity stress and indirectly leads to the entry of heavy elements and toxic substances into the soil which in this case, a great danger threats the environment. Hence the best solution to this problem is replacing organic fertilizers instead of chemical fertilizers. In this regard, a factorial experiment was conducted in a completely randomized block design with four replications and two treatments of salinity and humic acid in the Laboratory of Agronomy and Plant Breeding, Faculty of Agriculture, Maragheh University. There were four levels of salinity (0, 4, 8 and 12 ds/m) and humic acid treatment had three levels (0, 500 and 1000 ppm). The measured parameters included percent and speed of germination, Radicle length and Plumule, the fresh and dry weight of Radicle and Plumule, and a number of normal seedlings. The results showed that with increasing salinity levels, germination percent and speed, root and Plumule length and Radicle dry weight were significantly decreased. Humic acid treatments had a significant effect on germination percentage, Plumule length, Radicle and Plumule dry weight. The interaction between salinity and humic acid also had a significant effect on germination percent and speed, and Radicle length

Keywords:

Salinity stress , Humic acid , Germination , Radicle , Plumule