Effect of Different Levels of Salinity, Nitrogen and Torilis arvensis Competition on Growth Characteristics and Leaf Yield of Coriander (Coriandrum sativum)

In order to study the effect of salinity and nitrogen on the competition between coriander and Torilis arvensis, a factorial experiment with three factors of competition (The absence and the presence of Torilis arvensis), nitrogen fertilizer (0, 30, 60 and 90 kg Ha-1) salinity stress (0, 50, 75 and 100 mM NaCl) was carried out in a completely randomized design with three replications in the research greenhouse of Faculty of Agriculture, Razi University in 2018. Nitrogen and salinity affected on coriander growth characteristics. With the increasing salinity level, plant height, leaf number, fresh and dry weight of plant and leaf, yield and leaf area decreased. But nitrogen had a positive effect on morphological characteristics studied. The interaction between salinity and nitrogen showed that in all three levels of salinity with increasing nitrogen concentration increased coriander growth characteristics. So that the highest plant height, fresh and dry weight of the plant and leaf dry weight were observed in treatment 0 mM NaCl with 60 and 90 kg Ha-1 nitrogen levels. The highest number of leaf (13.99) was in treatment 0 mM NaCl with 60 kg Ha-1 nitrogen. Under salinity stress conditions, application of nitrogen 90 kg Ha-1 could reduce the negative effects of salinity stress by increasing growth and finally improving the morphological characteristics of the plant, which can affect the competition between coriander and Torilis arvensis.